Adding upstream version 2.4.1.upstream/2.4.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

41 files changed, 11717 insertions, 0 deletions

diff --git a/src/share/yang/Makefile.am b/src/share/yang/Makefile.am
new file mode 100644
index 0000000..c8c0085
--- /dev/null
+++ b/src/share/yang/Makefile.am
@@ -0,0 +1 @@
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diff --git a/src/share/yang/Makefile.in b/src/share/yang/Makefile.in
new file mode 100644
index 0000000..8afa86b
--- /dev/null
+++ b/src/share/yang/Makefile.in
@@ -0,0 +1,728 @@
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diff --git a/src/share/yang/modules/Makefile.am b/src/share/yang/modules/Makefile.am
new file mode 100644
index 0000000..ad93c5d
--- /dev/null
+++ b/src/share/yang/modules/Makefile.am
@@ -0,0 +1,26 @@
+SUBDIRS = utils
+
+yangmodulesdir = ${datarootdir}/${PACKAGE_NAME}/yang/modules
+
+yangmodules_list  =
+yangmodules_list += ietf-dhcpv6-client@2018-09-04.yang
+yangmodules_list += ietf-interfaces@2018-02-20.yang
+yangmodules_list += ietf-dhcpv6-options@2018-09-04.yang
+yangmodules_list += ietf-dhcpv6-relay@2018-09-04.yang
+yangmodules_list += ietf-dhcpv6-server@2018-09-04.yang
+yangmodules_list += ietf-dhcpv6-types@2018-09-04.yang
+yangmodules_list += ietf-inet-types@2013-07-15.yang
+yangmodules_list += ietf-yang-types@2013-07-15.yang
+yangmodules_list += kea-ctrl-agent@2019-08-12.yang
+yangmodules_list += kea-dhcp-ddns@2022-07-27.yang
+yangmodules_list += kea-dhcp-types@2023-06-28.yang
+yangmodules_list += kea-dhcp4-server@2023-06-28.yang
+yangmodules_list += kea-dhcp6-server@2023-06-28.yang
+yangmodules_list += kea-types@2019-08-12.yang
+yangmodules_list += keatest-module@2022-11-30.yang
+
+EXTRA_DIST = hashes ${yangmodules_list}
+
+if HAVE_NETCONF
+yangmodules_DATA = ${yangmodules_list}
+endif
diff --git a/src/share/yang/modules/Makefile.in b/src/share/yang/modules/Makefile.in
new file mode 100644
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@@ -0,0 +1 @@
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diff --git a/src/share/yang/modules/hashes/ietf-dhcpv6-options@2018-09-04.hash b/src/share/yang/modules/hashes/ietf-dhcpv6-options@2018-09-04.hash
new file mode 100644
index 0000000..41bc602
--- /dev/null
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new file mode 100644
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--- /dev/null
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diff --git a/src/share/yang/modules/hashes/ietf-dhcpv6-server@2018-09-04.hash b/src/share/yang/modules/hashes/ietf-dhcpv6-server@2018-09-04.hash
new file mode 100644
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new file mode 100644
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new file mode 100644
index 0000000..2e11e58
--- /dev/null
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index 0000000..547ffe8
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new file mode 100644
index 0000000..b9b186d
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new file mode 100644
index 0000000..e37cc12
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new file mode 100644
index 0000000..c73dcca
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new file mode 100644
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new file mode 100644
index 0000000..fec7e36
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new file mode 100644
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new file mode 100644
index 0000000..49d7419
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diff --git a/src/share/yang/modules/hashes/keatest-module@2022-11-30.hash b/src/share/yang/modules/hashes/keatest-module@2022-11-30.hash
new file mode 100644
index 0000000..6a6f5be
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diff --git a/src/share/yang/modules/ietf-dhcpv6-client@2018-09-04.yang b/src/share/yang/modules/ietf-dhcpv6-client@2018-09-04.yang
new file mode 100644
index 0000000..c4faa97
--- /dev/null
+++ b/src/share/yang/modules/ietf-dhcpv6-client@2018-09-04.yang
@@ -0,0 +1,346 @@
+module ietf-dhcpv6-client {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-client";
+  prefix "dhcpv6-client";
+
+  import ietf-dhcpv6-options {
+    prefix dhcpv6-options;
+  }
+  import ietf-dhcpv6-types {
+    prefix dhcpv6-types;
+  }
+  import ietf-interfaces {
+    prefix if;
+  }
+
+  organization "DHC WG";
+  contact
+   "cuiyong@tsinghua.edu.cn
+    wangh13@mails.tsinghua.edu.cn
+    lh.sunlinh@gmail.com
+    ian.farrer@telekom.de
+    sladjana.zechlin@telekom.de
+    hezihao9512@gmail.com  ";
+
+  description "This model defines a YANG data model that can be
+    used to configure and manage a DHCPv6 client.";
+
+  revision 2018-09-04 {
+    description "";
+    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  revision 2018-03-04 {
+    description "Resolved most issues on the DHC official
+    github";
+    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  revision 2017-12-22 {
+    description "Resolve most issues on Ian's github.";
+    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  revision 2017-11-24 {
+      description "First version of the separated client specific
+        YANG model.";
+      reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+  /*
+   * Data Nodes
+   */
+
+  container client {
+    presence "Enables the client";
+    description "dhcpv6 client portion";
+
+    container client-config {
+      description "configuration tree of client";
+      container duid {
+        description "Sets the DUID";
+        uses dhcpv6-types:duid;
+      }
+      list client-if {
+        key if-name;
+        description "A client may have several interfaces, it is more reasonable to
+          configure and manage parameters on the interface-level. The list defines
+          specific client interfaces and their data. Different interfaces are
+          distinguished by the key which is a configurable string value.";
+        leaf if-name {
+          type if:interface-ref;
+          mandatory true;
+          description "interface name";
+        }
+
+        leaf cli-id {
+          type uint32;
+          mandatory true;
+          description "client id";
+        }
+
+        /*
+        leaf description {
+          type string;
+          description "description of the client interface";
+        }
+        */
+
+        leaf pd-function {
+          type boolean;
+          mandatory true;
+          description "Whether the client can act as a requesting router
+            to request prefixes using prefix delegation ([RFC3633]).";
+        }
+        leaf rapid-commit {
+          type boolean;
+          mandatory true;
+          description "'1' indicates a client can initiate a Solicit-Reply message
+            exchange by adding a Rapid Commit option in Solicit message. '0' means
+            the client is not allowed to add a Rapid Commit option to request
+            addresses in a two-message exchange pattern.";
+        }
+
+        /*
+        container mo-tab {
+          description "The management tab label indicates the operation mode of the
+            DHCPv6 client.
+            'm'=1 and 'o'=1 indicate the client will use DHCPv6 to  obtain all the configuration
+            data.
+            'm'=1 and 'o'=0 are a meaningless combination.
+            'm'=0 and 'o'=1 indicate the client will use stateless DHCPv6 to obtain configuration
+            data apart from addresses/prefixes data.
+            'm'=0 and 'o'=0 represent the client will not use DHCPv6 but use SLAAC to
+            achieve configuration.";
+
+            // if - not sure about the intended use here as it seems
+            // to be redfining what will be received in the PIO. Is
+            // the intention to be whether they PIO options will be
+            // obeyed as received or overridden?
+          leaf m-tab {
+            type boolean;
+            mandatory true;
+            description "m tab";
+          }
+          leaf o-tab {
+            type boolean;
+            mandatory true;
+            description "o tab";
+          }
+        }
+        */
+
+        container client-configured-options {
+          description "client configured options";
+          uses dhcpv6-options:client-option-definitions;
+        }
+      }
+    }
+
+    container client-state {
+      config "false";
+      description "state tree of client";
+      container if-other-paras {
+        description "A client can obtain extra configuration
+          data other than address and prefix information through
+          DHCPv6. This container describes such data the client
+          was configured. The potential configuration data may
+          include DNS server addresses, SIP server domain names, etc.";
+        uses dhcpv6-options:server-option-definitions;
+      }
+     container packet-stats {
+        config "false";
+        description "A container records
+          all the packet status information
+          of a specific interface.";
+        leaf solicit-count {
+          type uint32;
+          mandatory true;
+          description "solicit counter";
+        }
+        leaf request-count {
+          type uint32;
+          mandatory true;
+          description "request counter";
+        }
+        leaf renew-count {
+          type uint32;
+          mandatory true;
+          description "renew counter";
+        }
+        leaf rebind-count {
+          type uint32;
+          mandatory true;
+          description "rebind counter";
+        }
+        leaf decline-count {
+          type uint32;
+          mandatory true;
+          description "decline counter";
+        }
+        leaf release-count {
+          type uint32;
+          mandatory true;
+          description "release counter";
+        }
+        leaf info-req-count {
+          type uint32;
+          mandatory true;
+          description "information request counter";
+        }
+        leaf advertise-count {
+          type uint32;
+          mandatory true;
+          description "advertise counter";
+        }
+        leaf confirm-count {
+          type uint32;
+          mandatory true;
+          description "confirm counter";
+        }
+        leaf reply-count {
+          type uint32;
+          mandatory true;
+          description "reply counter";
+        }
+        leaf reconfigure-count {
+          type uint32;
+          mandatory true;
+          description "recofigure counter";
+        }
+      }
+    }
+
+  }
+
+  /*
+   * Notifications
+   */
+
+  notification notifications {
+    description "dhcpv6 client notification module";
+    container dhcpv6-client-event {
+      description "dhcpv6 client event";
+
+      container ia-lease-event {
+        description "raised when the client was allocated
+          a new IA from the server or it renew/rebind/release
+          its current IA";
+        leaf event-type {
+          type enumeration {
+            enum "allocation" {
+              description "allocate";
+            }
+            enum "rebind" {
+              description "rebind";
+            }
+            enum "renew" {
+              description "renew";
+            }
+            enum "release" {
+              description "release";
+            }
+          }
+          mandatory true;
+          description "event type";
+        }
+        container duid {
+          description "Sets the DUID";
+          uses dhcpv6-types:duid;
+        }
+        leaf iaid {
+          type uint32;
+          mandatory true;
+          description "IAID";
+        }
+        leaf serv-name {
+          type string;
+          description "server name";
+        }
+        leaf description {
+          type string;
+          description "description of event";
+        }
+      }
+
+      container invalid-ia-detected {
+        description "raised when the identity association of the
+          client can be proved to be invalid.  Possible condition
+          includes duplicated address, illegal address, etc.";
+        container duid {
+          description "Sets the DUID";
+          uses dhcpv6-types:duid;
+        }
+        leaf cli-duid {
+          type uint32;
+          mandatory true;
+          description "duid of client";
+        }
+        leaf iaid {
+          type uint32;
+          mandatory true;
+          description "IAID";
+        }
+        leaf serv-name {
+          type string;
+          description "server name";
+        }
+        leaf description {
+          type string;
+          description "description of the event";
+        }
+      }
+
+      container retransmission-failed {
+        description "raised when the retransmission mechanism defined
+          in [RFC3315] is failed.";
+        container duid {
+          description "Sets the DUID";
+          uses dhcpv6-types:duid;
+        }
+        leaf description {
+          type enumeration {
+            enum "MRC failed" {
+              description "MRC failed";
+            }
+            enum "MRD failed" {
+              description "MRD failed";
+            }
+          }
+          mandatory true;
+          description "description of failure";
+        }
+      }
+
+      container failed-status-turn-up {
+        description "raised when the client receives a message includes
+          an unsuccessful Status Code option.";
+        container duid {
+          description "Sets the DUID";
+          uses dhcpv6-types:duid;
+        }
+        leaf status-code {
+          type enumeration {
+            enum "1" {
+              description "UnspecFail";
+            }
+            enum "2" {
+              description "NoAddrAvail";
+            }
+            enum "3" {
+              description "NoBinding";
+            }
+            enum "4" {
+              description "NotOnLink";
+            }
+            enum "5" {
+              description "UseMulticast";
+            }
+          }
+          mandatory true;
+          description "employed status code";
+        }
+      }
+
+    }
+  }
+}
diff --git a/src/share/yang/modules/ietf-dhcpv6-options@2018-09-04.yang b/src/share/yang/modules/ietf-dhcpv6-options@2018-09-04.yang
new file mode 100644
index 0000000..76169f1
--- /dev/null
+++ b/src/share/yang/modules/ietf-dhcpv6-options@2018-09-04.yang
@@ -0,0 +1,1391 @@
+module ietf-dhcpv6-options {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-options";
+  prefix "dhcpv6-options";
+
+  import ietf-inet-types {
+    prefix inet;
+  }
+  import ietf-yang-types {
+    prefix yang;
+  }
+  import ietf-dhcpv6-types {
+    prefix dhcpv6-types;
+  }
+
+  organization "DHC WG";
+  contact
+   "cuiyong@tsinghua.edu.cn
+    wangh13@mails.tsinghua.edu.cn
+    lh.sunlinh@gmail.com
+    ian.farrer@telekom.de
+    sladjana.zechlin@telekom.de
+    hezihao9512@gmail.com";
+
+  description "This model defines a YANG data model that can be
+    used to configure DHCPv6 options.";
+
+  revision 2018-09-04 {
+    description "";
+    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+  revision 2018-03-04 {
+    description "Resolved most issues on the DHC official
+    github";
+    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  revision 2017-12-22 {
+          description "Resolve most issues on Ian's github.";
+          reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  revision 2017-11-24 {
+    description "First version of the separated DHCPv6 options
+      YANG model.";
+    reference "I-D:draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  /*
+   * Features
+   */
+
+  //  features for server options
+        feature server-unicast-op {
+                description "Support for Server Unicast option";
+        }
+        feature sip-server-domain-name-list-op {
+                description "Support for SIP Server Domain Name List option";
+        }
+        feature sip-server-address-list-op {
+                description "Support for SIP Server Address List option";
+        }
+  feature dns-servers-op {
+    description "Support for DNS Servers Option";
+  }
+        feature domain-searchlist-op {
+                description "Support for Domain Search List Option";
+        }
+        feature nis-config-op {
+                description "Support for Network Information Service (NIS)
+                        Servers option";
+        }
+        feature nis-plus-config-op {
+                description "Support for Network Information Service V2 (NIS+)
+                        Servers option";
+        }
+        feature nis-domain-name-op {
+                description "Support for Network Information Service (NIS)
+                        Domain Name option";
+        }
+        feature nis-plus-domain-name-op {
+                description "Support for Network Information Service V2 (NIS+)
+                        Server option";
+        }
+        feature sntp-server-op {
+                description "Support for Simple Network Protocol Configuration
+                        (SNTP) Servers option";
+        }
+        feature info-refresh-time-op {
+                description "Support for Information Refresh Time option";
+        }
+        feature client-fqdn-op {
+                description "Support for Client FQDN option";
+        }
+        feature posix-timezone-op {
+                description "Support for New POIX Timezone option";
+        }
+        feature tzdb-timezone-op {
+                description "Support for New TZDB Timezone option";
+        }
+        feature ntp-server-op {
+                description "Support for Network Time Protocol (NTP)
+                        Server option";
+        }
+        feature boot-file-url-op {
+                description "Support for Boot File URL option";
+        }
+        feature boot-file-param-op {
+                description "Support for Boot File Parameters option";
+        }
+        feature aftr-name-op {
+                description "Support for Address Family Transition
+                        Router (AFTR) option";
+        }
+        feature kbr-default-name-op {
+                description "Support for Kerberos Default Name
+                        Option";
+        }
+        feature kbr-kdc-op {
+                description "Support for Kerberos KDC option";
+        }
+        feature sol-max-rt-op {
+                description "Support for SOL_MAX_RT option";
+        }
+        feature inf-max-rt-op {
+                description "Support for INF_MAX_RT option";
+        }
+        feature addr-selection-op {
+                description "Support for Address Selection opiton";
+        }
+        feature pcp-server-op {
+                description "Support for Port Control Protocol (PCP)
+                        option";
+        }
+        feature s46-rule-op {
+                description "Support for S46 Rule option";
+        }
+        feature s46-br-op {
+                description "Support for S46 Border Relay (BR) option";
+        }
+        feature s46-dmr-op {
+                description "Support for S46 Default Mapping Rule
+                        (DMR) option";
+        }
+        feature s46-v4-v6-binding-op {
+                description "Support for S46 IPv4/IPv6 Address
+                        Bind option";
+        }
+
+        // features for relay-supplied options
+        feature erp-local-domain-name-op {
+                description "Support for ERP Local Domain Name option";
+        }
+
+        // features for client options
+        feature option-request-op {
+                description "Support for Option Request option";
+        }
+        feature rapid-commit-op {
+                description "Support for Rapid Commit option";
+        }
+        feature user-class-op {
+                description "Support for User Class option";
+        }
+        feature vendor-class-op {
+                description "Support for Vendor Class option";
+        }
+        feature client-arch-type-op {
+                description "Support for Client System Architecture
+                        Type option";
+        }
+        feature client-network-interface-identifier-op {
+                description "Support for Client Network Interface
+                        Identifier option";
+        }
+        feature kbr-principal-name-op {
+                description "Support for Kerberos Principal
+                        Name option";
+        }
+        feature kbr-realm-name-op {
+                description "Support Kerberos Realm Name option";
+        }
+        feature client-link-layer-addr-op {
+                description "Support for Client Link-Layer Address
+                        Option";
+        }
+
+        // features for custom options
+        feature operator-op-ipv6-address {
+                description "Support for Option with IPv6 Addresses";
+        }
+        feature operator-op-single-flag {
+                description "Support for Option with Single Flag";
+        }
+        feature operator-op-ipv6-prefix {
+                description "Support for Option with IPv6 Prefix";
+        }
+        feature operator-op-int32 {
+                description "Support for Opion with 32-bit
+                        Integer Value";
+        }
+        feature operator-op-int16 {
+                description "Support for Opion with 16-bit Integer Value";
+        }
+        feature operator-op-int8 {
+                description "Support for Opion with 8-bit Integer Value";
+        }
+        feature operator-op-uri {
+                description "Support for Opion with URI";
+        }
+        feature operator-op-textstring {
+                description "Support for Opion with Text String";
+        }
+        feature operator-op-var-data {
+                description "Support for Opion with Variable-Length Data";
+        }
+        feature operator-op-dns-wire {
+                description "Support for Opion with DNS Wire
+                        Format Domain Name List";
+        }
+
+  /*
+   * Groupings
+   */
+
+  grouping server-option-definitions {
+    description "Contains definitions for options configured on the
+      DHCPv6 server which will be supplied to clients.";
+
+    container server-unicast-option {
+      if-feature server-unicast-op;
+      presence "Enable this option";
+      description "OPTION_UNICAST (12) Server Unicast Option";
+      reference "RFC3315: Dynamic Host Configuration Protocol for
+        IPv6 (DHCPv6)";
+      leaf server-address {
+        type inet:ipv6-address;
+        description "server ipv6 address";
+      }
+    }
+
+    container sip-server-domain-name-list-option {
+      if-feature sip-server-domain-name-list-op;
+      presence "Enable this option";
+      description "OPTION_SIP_SERVER_D (21) SIP Servers Domain Name List";
+      reference "RFC3319: Dynamic Host Configuration Protocol
+        (DHCPv6) Options for Session Initiation Protocol (SIP) Servers";
+      leaf sip-serv-domain-name {
+        type string;
+        mandatory true;
+        description "sip server domain name";
+      }
+    }
+
+    container sip-server-address-list-option {
+      if-feature sip-server-address-list-op;
+      presence "Enable this option";
+      description "OPTION_SIP_SERVER_A (22) SIP Servers IPv6 Address List";
+      reference "RFC3319: Dynamic Host Configuration Protocol (DHCPv6)
+        Options for Session Initiation Protocol (SIP) Servers";
+      list sip-server {
+        key sip-serv-id;
+        description "sip server info";
+        leaf sip-serv-id {
+          type uint8;
+          mandatory true;
+          description "sip server id";
+        }
+        leaf sip-serv-addr {
+          type inet:ipv6-address;
+          mandatory true;
+          description "sip server addr";
+        }
+      }
+    }
+
+    container dns-servers-option {
+      if-feature dns-servers-op;
+      presence "Enable this option";
+      description "OPTION_DNS_SERVERS (23) DNS recursive Name Server option";
+      reference "RFC3646: DNS Configuration options for Dynamic Host Configuration
+        Protocol for IPv6 (DHCPv6)";
+      list dns-server {
+        key dns-serv-id;
+        description "dns server info";
+        leaf dns-serv-id {
+          type uint8;
+          mandatory true;
+          description "DNS server list entry ID.";
+        }
+        leaf dns-serv-addr {
+          type inet:ipv6-address;
+          mandatory true;
+          description "DNS server address.";
+        }
+      }
+    }
+
+    container domain-searchlist-option {
+      if-feature domain-searchlist-op;
+      presence "Enable this option";
+      description "OPTION_DOMAIN_LIST (24) Domain Search List Option";
+      reference "RFC3646: DNS Configuration options for Dynamic
+        Host Configuration Protocol for IPv6 (DHCPv6)";
+      list domain-searchlist {
+        key domain-searchlist-id;
+        description "dns server info";
+        leaf domain-searchlist-id {
+          type uint8;
+          mandatory true;
+          description "Domain seachlist entry ID.";
+        }
+        leaf domain-search-list-entry {
+          type string;
+          mandatory true;
+          description "Domain search list entry.";
+        }
+      }
+    }
+    container nis-config-option {
+      if-feature nis-config-op;
+      presence "Enable this option";
+      description "OPTION_NIS_SERVERS (27) Network Information Service (NIS)
+        Servers Option.";
+      reference "RFC3898: Network Information Service (NIS) Configuration
+        Options for Dynamic Host Configuration Protocol for IPv6 (DHCPv6)";
+      list nis-server {
+        key nis-serv-id;
+        description "nis server info";
+        leaf nis-serv-id {
+          type uint8;
+          mandatory true;
+          description "nis server id";
+        }
+        leaf nis-serv-addr {
+          type inet:ipv6-address;
+          mandatory true;
+          description "nis server addr";
+        }
+      }
+    }
+
+    container nis-plus-config-option {
+      if-feature nis-plus-config-op;
+      presence "Enable this option";
+      description "OPTION_NISP_SERVERS (28): Network Information Service V2
+        (NIS+) Servers Option.";
+      reference "RFC3989: Network Information Service (NIS) Configuration
+        Options for Dynamic Host Configuration Protocol for IPv6 (DHCPv6)";
+      list nis-plus-server {
+        key nis-plus-serv-id;
+        description "NIS+ server information.";
+        leaf nis-plus-serv-id {
+          type uint8;
+          mandatory true;
+          description "nisp server id";
+        }
+        leaf nis-plus-serv-addr {
+          type inet:ipv6-address;
+          mandatory true;
+          description "nisp server addr";
+        }
+      }
+    }
+
+    container nis-domain-name-option {
+      if-feature nis-domain-name-op;
+      presence "Enable this option";
+      description "OPTION_NIS_DOMAIN_NAME (29) Network Information
+        Service (NIS) Domain Name Option";
+      reference "RFC3989: Network Information Service (NIS)
+        Configuration Options for Dynamic Host Configuration Protocol
+        for IPv6 (DHCPv6)";
+      leaf nis-domain-name {
+        type string;
+        description "The Network Information Service (NIS) Domain Name
+          option is used by the server to convey client's NIS Domain Name
+          info to the client.";
+      }
+    }
+
+    container nis-plus-domain-name-option {
+      if-feature nis-plus-domain-name-op;
+      presence "Enable this option";
+      description "OPTION_NISP_DOMAIN_NAME (30) Network Information
+        Service V2 (NIS+) Domain Name Option";
+      reference "RFC3989: Network Information Service (NIS)
+        Configuration Options for Dynamic Host Configuration Protocol
+        for IPv6 (DHCPv6)";
+      leaf nis-plus-domain-name {
+        type string;
+        description "The Network Information Service V2 (NIS+) Domain Name
+        option is used by the server to convey client's NIS+ Domain Name
+        info to the client.";
+      }
+    }
+
+
+    container sntp-server-option {
+      if-feature sntp-server-op;
+      presence "Enable this option";
+      description "OPTION_SNTP_SERVERS (31) Simple Network Time Protocol
+        (SNTP) Servers Option";
+      reference "RFC4075: Simple Network Time Protocol (SNTP) Configuration
+        Option for DHCPv6";
+      list sntp-server {
+        key sntp-serv-id;
+        description "sntp server info";
+        leaf sntp-serv-id {
+          type uint8;
+          mandatory true;
+          description "sntp server id";
+        }
+        leaf sntp-serv-addr {
+          type inet:ipv6-address;
+          mandatory true;
+          description "sntp server addr";
+        }
+      }
+    }
+
+    container info-refresh-time-option {
+      if-feature info-refresh-time-op;
+      presence "Enable this option";
+      description "OPTION_INFORMATION_REFRESH_TIME (32) Information Refresh
+        Time option.";
+      reference "RFC4242: Information Refresh Time Option for Dynamic Host
+        Configuration Protocol for IPv6 (DHCPv6";
+      leaf info-refresh-time {
+        type yang:timeticks;
+        mandatory true;
+        description "The refresh time.";
+      }
+    }
+
+    container client-fqdn-option {
+      if-feature client-fqdn-op;
+      presence "Enable this option";
+      description "OPTION_CLIENT_FQDN (39) DHCPv6 Client FQDN Option";
+      reference "RFC4704: The Dynamic Host Configuration Protocol for IPv6
+        (DHCPv6) Client Fully Qualified Domain Name (FQDN) Option";
+      leaf server-initiate-update {
+        type boolean;
+        mandatory true;
+        description "server initiate";
+      }
+      leaf client-initiate-update {
+        type boolean;
+        mandatory true;
+        description "client initiate";
+      }
+      leaf modify-name-from-cli {
+        type boolean;
+        mandatory true;
+        description "modify by client";
+      }
+    }
+
+    container posix-timezone-option {
+      if-feature posix-timezone-op;
+      presence "Enable this option";
+      description "OPTION_NEW_POSIX_TIMEZONE (41) Posix Timezone option";
+      reference "RFC4833: Timezone Options for DHCP";
+      leaf tz-posix {
+        type string;
+        mandatory true;
+        description "TZ Posix IEEE 1003.1 String";
+      }
+    }
+
+    container tzdb-timezone-option {
+      if-feature tzdb-timezone-op;
+      presence "Enable this option";
+      description "OPTION_NEW_TZDB_TIMEZONE (42) Timezone Database option";
+      reference "RFC4822: Timezone Options for DHCP";
+      leaf tz-database {
+        type string;
+        mandatory true;
+        description "Reference to the TZ Database";
+      }
+    }
+
+    container ntp-server-option {
+      //This option looks like it needs work to correctly model the
+      //option as defined in the RFC.
+
+      // Zihao - Re-modelled so it only contains one time source suboption
+
+      if-feature ntp-server-op;
+      presence "Enable this option";
+      description "OPTION_NTP_SERVER (56) NTP Server Option for DHCPv6";
+      reference "RFC5908: Network Time Protocol (NTP) Server Option for
+        DHCPv6";
+      list ntp-server {
+        key ntp-serv-id;
+        description "ntp server info";
+        leaf ntp-serv-id {
+          type uint8;
+          mandatory true;
+          description "NTP server id";
+        }
+        choice ntp-time-source-suboption {
+                description "Select a NTP time source suboption.";
+                case server-address {
+                leaf-list ntp-serv-addr-suboption {
+                  type inet:ipv6-address;
+                  description "NTP server addr";
+              }
+          }
+                case server-multicast-address {
+                        leaf-list ntp-serv-mul-addr-suboption {
+              type inet:ipv6-address;
+                    description "NTP server multicast addr";
+            }
+                }
+                case server-fqdn {
+                        leaf-list ntp-serv-fqdn-suboption {
+              type string;
+              description "NTP server fqdn";
+            }
+                }
+        }
+      }
+    }
+
+        container boot-file-url-option {
+                if-feature boot-file-url-op;
+                presence "Enable this option";
+                description "OPT_BOOTFILE_URL (59) Boot File URL Option";
+                reference "RFC5970: DHCPv6 Options for Network Boot";
+                list boot-file {
+                        key boot-file-id;
+                        description "boot file info";
+                        leaf boot-file-id {
+                                type uint8;
+                                mandatory true;
+                                description "boot file id";
+                        }
+        leaf-list suitable-arch-type {
+          type uint16;
+          description "architecture type";
+        }
+        leaf-list suitable-net-if {
+                type uint32;
+                description "network interface";
+        }
+                        leaf boot-file-url {
+                                type string;
+                                mandatory true;
+                                description "url for boot file";
+                        }
+                }
+        }
+
+        container boot-file-param-option {
+                if-feature boot-file-param-op;
+                presence "Enable this option";
+                description "OPT_BOOTFiLE_PARAM (60) Boot File Parameters Option";
+                reference "RFC5970: DHCPv6 Options for Network Boot";
+      list boot-file-paras {
+        key para-id;
+        description "boot file parameters";
+        leaf para-id {
+          type uint8;
+          mandatory true;
+          description "parameter id";
+        }
+        leaf parameter {
+          type string;
+          mandatory true;
+          description "parameter value";
+        }
+      }
+        }
+
+    container aftr-name-option {
+      if-feature aftr-name-op;
+      presence "Enable this option";
+      description "OPTION_AFTR_NAME (64) AFTR-Name DHCPv6 Option";
+      reference "RFC6334: Dynamic Host Configuration Protocol for IPv6
+        (DHCPv6) Option for Dual-Stack Lite";
+      leaf tunnel-endpoint-name {
+        type string;
+        mandatory true;
+        description "aftr name";
+      }
+    }
+
+    container kbr-default-name-option {
+        if-feature kbr-default-name-op;
+        presence "Enable this option";
+        description "OPTION_KRB_DEFAULT_REALM_NAME (77) Kerberos Default Realm Name Option";
+        reference "RFC6784: Kerberos Options for DHCPv6";
+      leaf default-realm-name {
+        type string;
+        mandatory true;
+        description "default realm name";
+      }
+    }
+
+    container kbr-kdc-option {
+        if-feature kbr-kdc-op;
+        presence "Enable this option";
+        description "OPTION_KRB_KDC (78) Kerberos KDB Option";
+        reference "RFC6784: Kerberos Options for DHCPv6";
+      list kdc-info {
+        key kdc-id;
+        description "kdc info";
+        leaf kdc-id {
+          type uint8;
+          mandatory true;
+          description "kdc id";
+        }
+        leaf priority {
+          type uint16;
+          mandatory true;
+          description "priority";
+        }
+        leaf weight {
+          type uint16;
+          mandatory true;
+          description "weight";
+        }
+        leaf transport-type {
+          type uint8;
+          mandatory true;
+          description "transport type";
+        }
+        leaf port-number {
+          type uint16;
+          mandatory true;
+          description "port number";
+        }
+        leaf kdc-ipv6-addr {
+          type inet:ipv6-address;
+          mandatory true;
+          description "kdc ipv6 addr";
+        }
+        leaf realm-name {
+          type string;
+          mandatory true;
+          description "realm name";
+        }
+      }
+    }
+
+    container sol-max-rt-option {
+      if-feature sol-max-rt-op;
+      presence "Enable this option";
+      description "OPTION_SOL_MAX_RT (82) sol max rt option";
+      reference "RFC7083: Modification to Default Values of
+        SOL_MAX_RT and INF_MAX_RT";
+        leaf sol-max-rt-value {
+          type yang:timeticks;
+          mandatory true;
+          description "sol max rt value";
+        }
+    }
+
+    container inf-max-rt-option {
+      if-feature inf-max-rt-op;
+      presence "Enable this option";
+      description "OPTION_INF_MAX_RT (83) inf max rt option";
+      reference "RFC7083: Modification to Default Values of
+        SOL_MAX_RT and INF_MAX_RT";
+      leaf inf-max-rt-value {
+        type yang:timeticks;
+        mandatory true;
+        description "inf max rt value";
+      }
+    }
+
+    container addr-selection-option {
+      if-feature addr-selection-op;
+      presence "Enable this option";
+      description "OPTION_ADDRSEL (84) and OPTION_ADDRSEL_TABLE (85)";
+      reference "RFC7078: Distributing Address Selection Policy Using
+        DHCPv6";
+      // if - Needs checking to see if this matches the RFC - there
+      // are two options here.
+      // Zihao - I think this matches RFC7078
+      leaf a-bit-set {
+        type boolean;
+        mandatory true;
+        description "a bit";
+      }
+      leaf p-bit-set {
+        type boolean;
+        mandatory true;
+        description "p bit";
+      }
+      list policy-table {
+        key policy-id;
+        description "policy table";
+        leaf policy-id {
+          type uint8;
+          mandatory true;
+          description "policy id";
+        }
+        leaf label {
+          type uint8;
+          mandatory true;
+          description "label";
+        }
+        leaf precedence {
+          type uint8;
+          mandatory true;
+          description "precedence";
+        }
+        leaf prefix-len {
+          type uint8;
+          mandatory true;
+          description "prefix length";
+        }
+        leaf prefix {
+          type inet:ipv6-prefix;
+          mandatory true;
+          description "prefix";
+        }
+      }
+    }
+
+    container pcp-server-option {
+      if-feature pcp-server-op;
+      presence "Enable this option";
+      description "OPTION_V6_PCP_SERVER (86) pcp server option";
+      reference "RFC7291: DHCP Options for the Port Control
+        Protocol (PCP)";
+      list pcp-server {
+        key pcp-serv-id;
+        description "pcp server info";
+        leaf pcp-serv-id {
+          type uint8;
+          mandatory true;
+          description "pcp server id";
+        }
+        leaf pcp-serv-addr {
+          type inet:ipv6-address;
+          mandatory true;
+          description "pcp server addr";
+        }
+      }
+    }
+
+    container s46-rule-option {
+      if-feature s46-rule-op;
+      presence "Enable this option";
+      description "OPTION_S46_RULE (89) S46 rule option";
+      reference "RFC7598: DHCPv6 Options for Configuration of
+        Softwire Address and Port-Mapped Clients";
+      list s46-rule {
+        key rule-id;
+        description "s46 rule";
+        leaf rule-id {
+          type uint8;
+          mandatory true;
+          description "rule id";
+        }
+        leaf rule-type {
+          type enumeration {
+            enum "BMR" {
+              description "BMR";
+            }
+            enum "FMR" {
+              description "FMR";
+            }
+          }
+          mandatory true;
+          description "rule type";
+        }
+        leaf prefix4-len {
+          type uint8;
+          mandatory true;
+          description "ipv4 prefix length";
+        }
+        leaf ipv4-prefix {
+          type inet:ipv4-prefix;
+          mandatory true;
+          description "ipv4 prefix";
+        }
+        leaf prefix6-len {
+          type uint8;
+          mandatory true;
+          description "ipv6 prefix length";
+        }
+        leaf ipv6-prefix {
+          type inet:ipv6-prefix;
+          mandatory true;
+          description "ipv6 prefix";
+        }
+        uses dhcpv6-types:portset-para;
+      }
+    }
+
+    container s46-br-option {
+      if-feature s46-br-op;
+      presence "Enable this option";
+      description "OPTION_S46_BR (90) S46 BR Option";
+      reference "RFC7598: DHCPv6 Options for Configuration of
+        Softwire Address and Port-Mapped Clients";
+      list br {
+        key br-id;
+        description "br info";
+        leaf br-id {
+          type uint8;
+          mandatory true;
+          description "br id";
+        }
+        leaf br-ipv6-addr {
+          type inet:ipv6-address;
+          mandatory true;
+          description "br ipv6 addr";
+        }
+      }
+    }
+
+    container s46-dmr-option {
+      if-feature s46-dmr-op;
+      presence "Enable this option";
+      description "OPTION_S46_DMR (91) S46 DMR Option";
+      reference "RFC7598: DHCPv6 Options for Configuration of
+        Softwire Address and Port-Mapped Clients";
+      list dmr {
+        key dmr-id;
+        description "dmr info";
+        leaf dmr-id {
+          type uint8;
+          mandatory true;
+          description "dmr id";
+        }
+        leaf dmr-prefix-len {
+          type uint8;
+          mandatory true;
+          description "dmr prefix length";
+        }
+        leaf dmr-ipv6-prefix {
+          type inet:ipv6-prefix;
+          mandatory true;
+          description "dmr ipv6 prefix";
+        }
+      }
+    }
+
+    container s46-v4-v6-binding-option {
+      if-feature s46-v4-v6-binding-op;
+      presence "Enable this option";
+      description "OPTION_S46_V4V6BIND (92) S46 IPv4/IPv6 Address
+        Binding option";
+      reference "RFC7598: DHCPv6 Options for Configuration of
+        Softwire Address and Port-Mapped Clients";
+      list ce {
+        key ce-id;
+        description "ce info";
+        leaf ce-id {
+          type uint8;
+          mandatory true;
+          description "ce id";
+        }
+        leaf ipv4-addr {
+          type inet:ipv4-address;
+          mandatory true;
+          description "ce ipv4 addr";
+        }
+        leaf bind-prefix6-len {
+          type uint8;
+          mandatory true;
+          description "bind ipv6 prefix
+            length";
+        }
+        leaf bind-ipv6-prefix {
+          type inet:ipv6-address;
+          mandatory true;
+          description "bind ipv6 prefix";
+        }
+        uses dhcpv6-types:portset-para;
+      }
+    }
+
+  }
+  //if - NB - The list of options needs to be updated.
+
+
+  grouping relay-supplied-option-definitions {
+    // if - The structure here needs to be checked and probably reworked.
+    description "OPTION_RSOO (66) Relay-Supplied Options option";
+    reference "RFC6422: Relay-Supplied DHCP Options";
+    container erp-local-domain-name-option {
+      if-feature erp-local-domain-name-op;
+      presence "Enable this option";
+      description "OPTION_ERP_LOCAL_DOMAIN_NAME (65) DHCPv6 ERP Local
+        Domain Name Option";
+      reference "RFC6440: The EAP Re-authentication Protocol (ERP)
+        Local Domain Name DHCPv6 Option";
+      list erp-for-client {
+        key cli-id;
+        description "erp for client";
+        leaf cli-id {
+          type uint32;
+          mandatory true;
+          description "client id";
+        }
+        container duid {
+          description "Sets the DUID";
+          // uses duid;
+          // if - Maybe DUID definition needs to be moved to this module.
+          uses dhcpv6-types:duid;
+        }
+        leaf erp-name {
+          type string;
+          mandatory true;
+          description "erp name";
+        }
+      }
+    }
+  }
+
+  grouping client-option-definitions {
+    description "Contains definitions for options configured on the
+      DHCPv6 client which will be sent to the server.";
+
+    list new-or-standard-cli-option {
+      key option-code;
+      description "new or standard client option";
+      leaf option-code {
+        type uint16;
+        mandatory true;
+        description "option code";
+      }
+      leaf option-name {
+        type string;
+        mandatory true;
+        description "option name";
+      }
+      leaf option-description {
+        type string;
+        mandatory true;
+        description "description of client
+          option";
+      }
+      leaf option-reference {
+        type string;
+        description "the reference of option";
+      }
+      leaf option-value {
+        type string;
+        mandatory true;
+        description "the option value";
+      }
+    }
+
+    container option-request-option {
+      if-feature option-request-op;
+      presence "Enable this option";
+      description "OPTION_ORO (6) Option Request Option";
+      reference "RFC3315: Dynamic Host Configuration Protocol for
+      IPv6 (DHCPv6)";
+      list oro-option {
+        key option-code;
+        description "oro option";
+        leaf option-code {
+          type uint16;
+          mandatory true;
+          description "option code";
+        }
+        leaf description {
+          type string;
+          mandatory true;
+          description "description of oro
+            options";
+        }
+      }
+    }
+
+    container user-class-option {
+      if-feature user-class-op;
+      presence "Enable this option";
+      description "OPTION_USER_CLASS (15) User Class Option";
+      reference "RFC3315: Dynamic Host Configuration Protocol
+        for IPv6 (DHCPv6)";
+      list user-class {
+        key user-class-id;
+        description "user class";
+        leaf user-class-id {
+          type uint8;
+          mandatory true;
+          description "user class id";
+        }
+        leaf user-class-data {
+          type string;
+          mandatory true;
+          description "The information contained in the data area
+            of this option is contained in one or more opaque
+            fields that represent the user class or classes of
+            which the client is a member. ";
+        }
+      }
+    }
+
+    container vendor-class-option {
+      if-feature vendor-class-op;
+      presence "Enable this option";
+      description "OPTION_VENDOR_CLASS (16) Vendor Class Option";
+      reference "RFC3315: Dynamic Host Configuration Protocol
+        for IPv6 (DHCPv6)";
+      leaf enterprise-number {
+        type uint32;
+        mandatory true;
+        description "enterprise number";
+      }
+      list vendor-class {
+          key vendor-class-id;
+          description "vendor class";
+        leaf vendor-class-id {
+          type uint8;
+          mandatory true;
+          description "vendor class id";
+        }
+        leaf vendor-class-data {
+          type string;
+          mandatory true;
+          description "The vendor-class-data is composed of a series of
+            separate items, each of which describes some characteristic
+            of the client's hardware configuration. Examples of
+            vendor-class-data instances might include the version of the
+            operating system the client is running or the amount of memory
+            installed on the client.";
+        }
+      }
+    }
+
+    container client-fqdn-option {
+      if-feature client-fqdn-op;
+      presence "Enable this option";
+      description "OPTION_CLIENT_FQDN (39) The Dynamic Host
+        Configuration Protocol for IPv6 (DHCPv6) Client Fully
+        Qualified Domain Name (FQDN) Option";
+      reference "RFC4704: The Dynamic Host Configuration Protocol
+        for IPv6 (DHCPv6) Client Fully Qualified Domain Name (FQDN)
+        Option";
+      leaf fqdn {
+        type string;
+        mandatory true;
+        description "fqdn";
+      }
+      leaf server-initiate-update {
+        type boolean;
+        mandatory true;
+        description "whether server initiate";
+      }
+      leaf client-initiate-update {
+        type boolean;
+        mandatory true;
+        description "whether client initiate";
+      }
+    }
+
+    container client-arch-type-option {
+      if-feature client-arch-type-op;
+      presence "Enable this option";
+      description "OPTION_CLIENT_ARCH_TYPE (61) Client System
+        Architecture Type Option";
+      reference "RFC5970: DHCPv6 Options for Network Boot";
+      list architecture-types {
+        key type-id;
+        description "architecture types";
+        leaf type-id {
+          type uint16;
+          mandatory true;
+          description "type id";
+        }
+        leaf most-preferred {
+          type boolean;
+          mandatory true;
+          description "most preferred flag";
+        }
+      }
+    }
+
+    container client-network-interface-identifier-option {
+      if-feature client-network-interface-identifier-op;
+      presence "Enable this option";
+      description "OPTION_NII (62) Client Network Interface
+          Identifier Option";
+      reference "RFC5970: DHCPv6 Options for Network Boot";
+      leaf type {
+        type uint8;
+        mandatory true;
+        description "type";
+      }
+      leaf major {
+        type uint8;
+        mandatory true;
+        description "major";
+      }
+      leaf minor {
+        type uint8;
+        mandatory true;
+        description "minor";
+      }
+    }
+
+    container kbr-principal-name-option {
+      if-feature kbr-principal-name-op;
+      presence "Enable this option";
+      description "OPTION_KRB_PRINCIPAL_NAME (75) Kerberos
+        Principal Name Option";
+      reference "RFC6784: Kerberos Options for DHCPv6";
+      list principle-name {
+          key principle-name-id;
+          description "principle name";
+          leaf principle-name-id {
+                  type uint8;
+                  mandatory true;
+                  description "principle name id";
+          }
+          leaf name-type {
+                  type int32;
+                  mandatory true;
+                  description "This field specifies the type of name that follows.";
+          }
+          leaf name-string {
+                  type string;
+                  mandatory true;
+                  description "This field encodes a sequence of components that form
+                          a name, each component encoded as a KerberoString";
+          }
+      }
+    }
+
+    container kbr-realm-name-option {
+        if-feature kbr-realm-name-op;
+        presence "Enable this option";
+        description "OPTION_KRB_REALM_NAME (76) Kerberos Realm Name Option";
+        reference "RFC6784: Kerberos Options for DHCPv6";
+        leaf realm-name {
+                type string;
+                mandatory true;
+                description "realm name";
+        }
+    }
+
+    container client-link-layer-addr-option {
+      if-feature client-link-layer-addr-op;
+      presence "Enable this option";
+      description "OPTION_CLIENT_LINKLAYER_ADDR (79) DHCPv6 Client
+        Link-Layer Address Option";
+      reference "RFC6939: Client Link-Layer Address Option in
+        DHCPv6";
+      leaf link-layer-type {
+        type uint16;
+        mandatory true;
+        description "Client link-layer address type. The link-layer
+          type MUST be a valid hardware type assigned by the IANA,
+          as described in [RFC0826]";
+      }
+      leaf link-layer-addr {
+        type string;
+        mandatory true;
+        description "Client link-layer address";
+      }
+    }
+
+  }
+
+
+  grouping custom-option-definitions {
+    description "operator customized options";
+
+    container operator-option-ipv6-address {
+      if-feature operator-op-ipv6-address;
+      presence "Enable this option";
+      description "operator ipv6 address option";
+      reference "RFC7227: Guidelines for Creating New DHCPv6 Options";
+      list operator-ipv6-addr {
+        key operator-ipv6-addr-id;
+        description "operator ipv6 address info";
+        leaf operator-ipv6-addr-id {
+          type uint8;
+          mandatory true;
+          description "operator ipv6 address id";
+        }
+        leaf operator-ipv6-addr {
+          type inet:ipv6-address;
+          mandatory true;
+          description "operator ipv6 address id";
+        }
+      }
+    }
+
+    container operator-option-single-flag {
+      if-feature operator-op-single-flag;
+      presence "Enable this option";
+      description "operator single flag";
+      reference "RFC7227: Guidelines for Creating New DHCPv6
+        Options";
+      list flag {
+        key flag-id;
+        description "operator single flag info";
+        leaf flag-id {
+          type uint8;
+          mandatory true;
+          description "operator single flag id";
+        }
+        leaf flag-value{
+          type boolean;
+          mandatory true;
+          description "operator single flag value";
+        }
+      }
+    }
+
+    container operator-option-ipv6-prefix {
+      if-feature operator-op-ipv6-prefix;
+      presence "Enable this option";
+      description "operator ipv6 prefix option";
+      reference "RFC7227: Guidelines for Creating New DHCPv6
+        Options";
+      list operator-ipv6-prefix {
+        key operator-ipv6-prefix-id;
+        description "operator ipv6 prefix info";
+        leaf operator-ipv6-prefix-id {
+          type uint8;
+          mandatory true;
+          description "operator ipv6 prefix id";
+        }
+        leaf operator-ipv6-prefix6-len {
+          type uint8;
+          mandatory true;
+          description "operator ipv6 prefix length";
+        }
+        leaf operator-ipv6-prefix {
+          type inet:ipv6-prefix;
+          mandatory true;
+          description "operator ipv6 prefix";
+        }
+      }
+    }
+
+    container operator-option-int32 {
+      if-feature operator-op-int32;
+      presence "Enable this option";
+      description "operator integer 32 option";
+      reference "RFC7227: Guidelines for Creating New DHCPv6
+        Options";
+      list int32val {
+        key int32val-id;
+        description "operator integer 32 info";
+        leaf int32val-id {
+          type uint8;
+          mandatory true;
+          description "operator integer 32 id";
+        }
+        leaf int32val {
+          type uint32;
+          mandatory true;
+          description "operator integer 32 value";
+        }
+      }
+    }
+
+    container operator-option-int16 {
+      if-feature operator-op-int16;
+      presence "Enable this option";
+      description "operator integer 16 option";
+      reference "RFC7227: Guidelines for Creating New DHCPv6
+        Options";
+      list int16val {
+        key int16val-id;
+        description "operator integer 16 info";
+        leaf int16val-id {
+          type uint8;
+          mandatory true;
+          description "operator integer 16 id";
+        }
+        leaf int16val {
+          type uint16;
+          mandatory true;
+          description "operator integer 16 value";
+        }
+      }
+    }
+
+    container operator-option-int8 {
+      if-feature operator-op-int8;
+      presence "Enable this option";
+      description "operator integer 8 option";
+      reference "RFC7227: Guidelines for Creating New DHCPv6
+        Options";
+      list int8val {
+        key int8val-id;
+        description "operator integer 8 info";
+        leaf int8val-id {
+          type uint8;
+          mandatory true;
+          description "operator integer 8 id";
+        }
+        leaf int8val {
+          type uint8;
+          mandatory true;
+          description "operator integer 8 value";
+        }
+      }
+    }
+
+    container operator-option-uri {
+      if-feature operator-op-uri;
+      presence "Enable this option";
+      description "operator uri option";
+      reference "RFC7227: Guidelines for Creating New DHCPv6 Options";
+      list uri{
+        key uri-id;
+        description "operator uri info";
+        leaf uri-id {
+          type uint8;
+          mandatory true;
+          description "operator uri id";
+        }
+        leaf uri {
+          type string;
+          mandatory true;
+          description "operator uri value";
+        }
+      }
+    }
+
+    container operator-option-textstring {
+      if-feature operator-op-textstring;
+      presence "Enable this option";
+      description "operator itext string option";
+      reference "RFC7227: Guidelines for Creating New DHCPv6 Options";
+      list textstring{
+        key textstring-id;
+        description "operator text string info";
+        leaf textstring-id {
+          type uint8;
+          mandatory true;
+          description "operator text string id";
+        }
+        leaf textstring {
+          type string;
+          mandatory true;
+          description "operator text string value";
+        }
+      }
+    }
+
+    container operator-option-var-data {
+      if-feature operator-op-var-data;
+      presence "Enable this option";
+      description "operator variable length data option";
+      reference "RFC7227: Guidelines for Creating New DHCPv6 Options";
+      list int32val {
+        key var-data-id;
+        description "operator ivariable length data info";
+        leaf var-data-id {
+          type uint8;
+          mandatory true;
+          description "operator variable length id";
+        }
+        leaf var-data {
+          type binary;
+          mandatory true;
+          description "operator variable length value";
+        }
+      }
+    }
+
+    container operator-option-dns-wire {
+      if-feature operator-op-dns-wire;
+      presence "Enable this option";
+      description "operator dns wire format domain name list option";
+      reference "RFC7227: Guidelines for Creating New DHCPv6
+        Options";
+      list operator-option-dns-wire {
+        key operator-option-dns-wire-id;
+        description "operator dns wire format info";
+        leaf operator-option-dns-wire-id {
+          type uint8;
+          mandatory true;
+          description "operator dns wire format id";
+        }
+        leaf operator-option-dns-wire{
+          type binary;
+          mandatory true;
+          description "operator dns wire format value";
+        }
+      }
+    }
+
+  }
+}
diff --git a/src/share/yang/modules/ietf-dhcpv6-relay@2018-09-04.yang b/src/share/yang/modules/ietf-dhcpv6-relay@2018-09-04.yang
new file mode 100644
index 0000000..b480ff4
--- /dev/null
+++ b/src/share/yang/modules/ietf-dhcpv6-relay@2018-09-04.yang
@@ -0,0 +1,476 @@
+module ietf-dhcpv6-relay {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-relay";
+  prefix "dhcpv6-relay";
+
+  import ietf-inet-types {
+    prefix inet;
+  }
+  import ietf-dhcpv6-options {
+    prefix dhcpv6-options;
+  }
+  import ietf-dhcpv6-types {
+    prefix dhcpv6-types;
+  }
+  import ietf-interfaces {
+    prefix if;
+  }
+
+  organization
+    "IETF DHC (Dynamic Host Configuration) Working group";
+
+  contact
+    "cuiyong@tsinghua.edu.cn
+     lh.sunlinh@gmail.com
+     ian.farrer@telekom.de
+     sladjana.zechlin@telekom.de
+     hezihao9512@gmail.com";
+
+  description
+    "This model defines a YANG data model that can be
+     used to configure and manage a DHCPv6 relay.";
+
+    revision 2018-09-04 {
+    description "";
+    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  revision 2018-03-04 {
+    description "Resolved most issues on the DHC official
+    github";
+    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  revision 2017-12-22 {
+    description
+      "Resolve most issues on Ian's github.";
+    reference
+      "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  revision 2017-11-24 {
+    description
+      "First version of the separated relay specific
+       YANG model.";
+    reference
+      "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  /*
+   * Data Nodes
+   */
+
+  container relay {
+    presence
+      "Enables the relay";
+    description
+      "DHCPv6 relay portion";
+
+    container relay-config {
+      description
+        "This container contains the configuration data
+        of the relay.";
+      container relay-attributes {
+        description
+          "A container describes some basic attributes of the relay
+           agent including some relay agent specific options data that
+           need to be configured previously.
+           Such options include Remote-Id option and Subscriber-Id
+           option.";
+        leaf name {
+          type string;
+          description
+            "Relay agent name";
+        }
+        leaf description {
+          type string;
+          description
+            "Textual description of the relay agent";
+        }
+        leaf-list dest-addrs {
+          type inet:ipv6-address;
+          description
+            "Each DHCPv6 relay agent may be configured with a list
+             of destination addresses.
+             This node defines such a list of IPv6 addresses that
+             may include unicast addresses, multicast addresses or
+             other addresses.";
+        }
+        list subscribers {
+          key subscriber;
+          description
+            "Subscribers";
+          leaf subscriber {
+            type uint8;
+            mandatory true;
+            description
+              "Subscriber";
+          }
+          leaf subscriber-id {
+            type string;
+            mandatory true;
+            description
+              "Subscriber id";
+          }
+        }
+        list remote-host {
+          key ent-num;
+          description
+            "Remote host";
+          leaf ent-num {
+            type uint32;
+            mandatory true;
+            description
+              "Enterprise number";
+          }
+          leaf remote-id {
+            type string;
+            mandatory true;
+            description
+              "Remote id";
+          }
+        }
+        uses dhcpv6-types:vendor-infor;
+      }
+
+      container rsoo-option-sets {
+        description
+         "DHCPv6 relay agent could provide some information that would
+          be useful to DHCPv6 client.
+          Since relay agent cannot provide options directly to the
+          client, RSOO-enabled options are defined to propose options
+          for the server to send to the client.
+          This container models such RSOO-enabled options.";
+        reference
+          "RFC6422";
+        list option-set {
+          key option-set-id;
+          description
+            "This list under the 'rsoo-option-sets' container is similar
+             to the that defined in server module.
+             It allows the relay to implement several sets of RSOO-enabled
+             options for different interfaces.
+             The list only includes the EAP Re-authentication Protocol
+             (ERP) Local Domain Name DHCPv6 Option defined in RFC6440,
+             since it is the only one RSOO-enabled options accepted by
+             IANA so far.";
+          leaf option-set-id {
+            type uint32;
+            description "Option sed id";
+          }
+          uses dhcpv6-options:relay-supplied-option-definitions;
+        }
+      }
+
+      list relay-if {
+        // if - This should reference an entry in ietf-interfaces
+        key if-name;
+        description
+        "A relay agent may have several interfaces, we should provide
+         a way to configure and manage parameters on the interface-level.
+         A list that describes specific interfaces and their corresponding
+         parameters is employed to fulfil the configfuration. Here we use
+         a string called 'if-name' as the key of list.";
+        leaf if-name {
+          type if:interface-ref;
+          mandatory true;
+          description
+            "Interface name";
+        }
+        leaf interface-id {
+          type string;
+          description
+            "Interface id";
+        }
+
+        /*
+        leaf enable {
+          type boolean;
+          mandatory true;
+          description "whether this interface is enabled";
+        }
+        */
+
+        leaf ipv6-address {
+          type inet:ipv6-address;
+          description
+            "IPv6 address for this interface";
+        }
+
+        leaf rsoo-option-set-id {
+          type leafref {
+            path "/relay/relay-config/rsoo-option-sets/option-set/option-set-id";
+          }
+          description "Configured Relay Supplied Option set";
+        }
+
+        list next-entity {
+          key dest-addr;
+          description
+            "This node defines a list that is used to describe the
+             next hop entity of this relay distinguished by their
+             addresses.";
+          leaf dest-addr {
+            type inet:ipv6-address;
+            mandatory true;
+            description
+              "Destination addr";
+          }
+          leaf available {
+            type boolean;
+            mandatory true;
+            description
+              "Whether the next entity is available or not";
+          }
+          leaf multicast {
+            type boolean;
+            mandatory true;
+            description
+              "Whether the address is multicast or not";
+          }
+          leaf server {
+            type boolean;
+            mandatory true;
+            description
+              "Whether the next entity is a server";
+          }
+        }
+      }
+    }
+
+
+    container relay-state {
+      config "false";
+      description
+        "State data of relay";
+      list relay-if {
+        key if-name;
+        description
+        "A relay agent may have several interfaces, we should provide
+         a way to configure and manage parameters on the interface-level.
+         A list that describes specific interfaces and their corresponding
+         parameters is employed to fulfil the configfuration. Here we use
+         a string called 'if-name' as the key of list.";
+        leaf if-name{
+          type string;
+          mandatory true;
+          description
+            "Interface name";
+        }
+        list pd-route {
+          // if - need to look at if/how we model these. If they are
+          // going to be modelled, then they should be ro state
+          // entries (we're not trying to configure routes here)
+          key pd-route-id;
+          description "pd route";
+          leaf pd-route-id {
+            type uint8;
+            mandatory true;
+            description
+              "PD route id";
+          }
+          leaf requesting-router-id {
+            type uint32;
+            mandatory true;
+            description
+              "Requesting router id";
+          }
+          leaf delegating-router-id {
+            type uint32;
+            mandatory true;
+            description
+              "Delegating router id";
+          }
+          leaf next-router {
+            type inet:ipv6-address;
+            mandatory true;
+            description
+              "Next router";
+          }
+          leaf last-router {
+            type inet:ipv6-address;
+            mandatory true;
+            description
+              "Previous router";
+          }
+        }
+        list next-entity {
+          key dest-addr;
+          description "This node defines a list that is used to
+            describe the next hop entity of this relay agent.
+            Different entities are distinguished by their
+            addresses.";
+          leaf dest-addr {
+            type inet:ipv6-address;
+            mandatory true;
+            description "destination addr";
+          }
+          container packet-stats {
+            description "packet statistics";
+            leaf solicit-rvd-count {
+              type uint32;
+              mandatory true;
+              description "solicit received counter";
+            }
+            leaf request-rvd-count {
+              type uint32;
+              mandatory true;
+              description "request received counter";
+            }
+            leaf renew-rvd-count {
+              type uint32;
+              mandatory true;
+              description "renew received counter";
+            }
+            leaf rebind-rvd-count {
+              type uint32;
+              mandatory true;
+              description "rebind recevied counter";
+            }
+            leaf decline-rvd-count {
+              type uint32;
+              mandatory true;
+              description "decline received counter";
+            }
+            leaf release-rvd-count {
+              type uint32;
+              mandatory true;
+              description "release received counter";
+            }
+            leaf info-req-rvd-count {
+              type uint32;
+              mandatory true;
+              description "information request counter";
+            }
+            leaf relay-for-rvd-count {
+              type uint32;
+              mandatory true;
+              description "relay forward received counter";
+            }
+            leaf relay-rep-rvd-count {
+              type uint32;
+              mandatory true;
+              description "relay reply received counter";
+            }
+            leaf packet-to-cli-count {
+              type uint32;
+              mandatory true;
+              description "packet to client counter";
+            }
+            leaf adver-sent-count {
+              type uint32;
+              mandatory true;
+              description "advertisement sent counter";
+            }
+            leaf confirm-sent-count {
+              type uint32;
+              mandatory true;
+              description "confirm sent counter";
+            }
+            leaf reply-sent-count {
+              type uint32;
+              mandatory true;
+              description "reply sent counter";
+            }
+            leaf reconfig-sent-count {
+              type uint32;
+              mandatory true;
+              description "reconfigure sent counter";
+            }
+            leaf relay-for-sent-count {
+              type uint32;
+              mandatory true;
+              description "relay forward sent counter";
+            }
+            leaf relay-rep-sent-count {
+              type uint32;
+              mandatory true;
+              description "relay reply sent counter";
+            }
+          }
+        }
+      }
+      container relay-stats {
+        config "false";
+        description
+          "Relay statistics";
+        leaf cli-packet-rvd-count {
+          type uint32;
+          mandatory true;
+          description
+            "Client packet received counter";
+        }
+        leaf relay-for-rvd-count {
+          type uint32;
+          mandatory true;
+          description
+            "Relay forward received counter";
+        }
+        leaf relay-rep-rvd-count {
+          type uint32;
+          mandatory true;
+          description
+            "Relay reply recevied counter";
+        }
+        leaf packet-to-cli-count {
+          type uint32;
+          mandatory true;
+          description
+            "Packet to client counter";
+        }
+        leaf relay-for-sent-count {
+          type uint32;
+          mandatory true;
+          description
+            "Relay forward sent counter";
+        }
+        leaf relay-rep-sent-count {
+          type uint32;
+          mandatory true;
+          description
+            "Relay reply sent counter";
+        }
+        leaf discarded-packet-count {
+          type uint32;
+          mandatory true;
+          description
+            "Discarded packet counter";
+        }
+      }
+    }
+  }
+
+  /*
+   * Notifications
+   */
+
+  notification notifications {
+    description "DHCPv6 relay notification module";
+    container dhcpv6-relay-event {
+      description
+        "DHCPv6 relay event";
+      container topo-changed {
+        description
+        "Raised when the topology of the relay agent is changed.";
+        leaf relay-if-name {
+          type string;
+          mandatory true;
+          description
+            "Relay interface name";
+        }
+        leaf first-hop {
+          type boolean;
+          mandatory true;
+          description
+            "First hop";
+        }
+        leaf last-entity-addr {
+          type inet:ipv6-address;
+          mandatory true;
+          description
+            "Last entity address";
+        }
+      }
+    }
+  }
+}
diff --git a/src/share/yang/modules/ietf-dhcpv6-server@2018-09-04.yang b/src/share/yang/modules/ietf-dhcpv6-server@2018-09-04.yang
new file mode 100644
index 0000000..0e13df4
--- /dev/null
+++ b/src/share/yang/modules/ietf-dhcpv6-server@2018-09-04.yang
@@ -0,0 +1,967 @@
+module ietf-dhcpv6-server {
+        yang-version 1.1;
+        namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-server";
+        prefix "dhcpv6-server";
+
+        import ietf-inet-types {
+                prefix inet;
+  }
+        import ietf-yang-types {
+        prefix yang;
+        }
+        import ietf-dhcpv6-options {
+        prefix dhcpv6-options;
+  }
+  import ietf-dhcpv6-types {
+        prefix dhcpv6-types;
+  }
+  import ietf-interfaces {
+        prefix if;
+  }
+
+  organization "DHC WG";
+  contact
+        "cuiyong@tsinghua.edu.cn
+         lh.sunlinh@gmail.com
+         ian.farrer@telekom.de
+         sladjana.zechlin@telekom.de
+         hezihao9512@gmail.com";
+
+        description "This model defines a YANG data model that can be
+        used to configure and manage a DHCPv6 server.";
+
+  revision 2018-09-04 {
+    description "";
+    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  revision 2018-03-04 {
+        description "Resolved most issues on the DHC official
+        github";
+        reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+        revision 2017-12-22 {
+                description "Resolve most issues on Ian's github.";
+        reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+        }
+
+        revision 2017-11-24 {
+        description "First version of the separated server specific
+                YANG model.";
+        reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+        }
+
+        /*
+        * Typedef
+        */
+        typedef threshold {
+        type union {
+                type uint16 {
+                range 0..100;
+                }
+                type enumeration {
+                enum "disabled" {
+                        description "No threshold";
+                }
+        }
+        }
+        description "Threshold value in percent";
+        }
+
+        /*
+        * Data Nodes
+        */
+        container server {
+                presence "Enables the server";
+        description "DHCPv6 server portion";
+
+    /*
+     * Configuration data
+     */
+    container server-config {
+        description "This container contains the configuration data
+            of a server.";
+        container serv-attributes {
+                    description
+                     "This container contains basic attributes of a DHCPv6 server
+                     such as IPv6 address, server name  and so on. Some optional
+                     functions that can be provided  by the server is also included.";
+                    container duid {
+                      description "Sets the DUID of server";
+                      uses dhcpv6-types:duid;
+                    }
+                    leaf name {
+                type string;
+                description "server's name";
+                    }
+                    leaf description {
+                type string;
+                description "description of the server.";
+                    }
+                    leaf-list ipv6-address {
+                type inet:ipv6-address;
+                description "server's IPv6 address.";
+                    }
+                    leaf-list interfaces-config {
+                // Note - this should probably be references to
+                // entries in the ietf-interfaces model
+                type if:interface-ref;
+                description "A leaf list to denote which one or more interfaces
+                        the server should listen on. The default value is to listen
+                        on all the interfaces. This node is also used to set a unicast
+                        address for the server to listen with a specific interface.
+                  For example, if people want the server to listen on a unicast
+                  address with a specific interface, he can use the format like
+                  'eth1/2001:db8::1'.";
+                    }
+                                container lease-storage {
+                                        description "Indicates how the server stores the lease";
+                                        choice storage-type {
+                                                description "the type of lease storage";
+                                                // leaf persist {
+                                                //              type boolean;
+                                                //              mandatory true;
+                                                //              description "controls whether the new leases and updates to existing leases are
+                                                //              written to the file";
+                                                // }
+                                                case memfile {
+                                                        description "the server stores lease information in a CSV file";
+
+                                                        leaf memfile-name {
+                                                                type string;
+                                                                description "specifies an absolute location of the lease file in which new leases
+                                                                and lease updates will be recorded";
+                                                        }
+
+                                                        leaf memfile-lfc-interval {
+                                                                type uint64;
+                                                                description "specifies the interval in seconds, at which the server will perform a
+                                                                lease file cleanup (LFC)";
+                                                        }
+
+                                                }
+                                                case mysql {
+                                                        leaf mysql-name {
+                                                                type string;
+                                                                description "type of the database";
+                                                        }
+                                                        leaf mysql-host {
+                                                                type string;
+                                                                description "If the database is located
+                                                                on a different system to the DHCPv6 server, the database host name must also be specified.";
+                                                        }
+                                                        leaf mysql-password {
+                                                                type string;
+                                                                description "the credentials of the account under which the server will access the database";
+                                                        }
+                                                        leaf mysql-port {
+                                                                type uint8;
+                                                                description "If the database is located on a different system, the port number may be specified";
+                                                        }
+                                                        leaf mysql-lfc-interval {
+                                                                type uint64;
+                                                                description "specifies the interval in seconds, at which the server will perform a
+                                                                lease file cleanup (LFC)";
+                                                        }
+                                                        leaf mysql-connect-timeout {
+                                                                type uint64;
+                                                                description "If the database is located on a different system, a longer interval needs to be specified";
+                                                        }
+
+                                                }
+                                                case postgresql {
+                                                        leaf postgresql-name {
+                                                                type string;
+                                                                description "type of the database";
+                                                        }
+                                                        leaf postgresql-host {
+                                                                type string;
+                                                                description "If the database is located
+                                                                on a different system to the DHCPv6 server, the database host name must also be specified.";
+                                                        }
+                                                        leaf postgresql-password {
+                                                                type string;
+                                                                description "the credentials of the account under which the server will access the database";
+                                                        }
+                                                        leaf postgresql-port {
+                                                                type uint8;
+                                                                description "If the database is located on a different system, the port number may be specified";
+                                                        }
+                                                        leaf postgresql-lfc-interval {
+                                                                type uint64;
+                                                                description "specifies the interval in seconds, at which the server will perform a
+                                                                lease file cleanup (LFC)";
+                                                        }
+                                                        leaf postgresql-connect-timeout {
+                                                                type uint64;
+                                                                description "If the database is located on a different system, a longer interval needs to be specified";
+                                                        }
+                                                }
+                                                case cassandra {
+                                                        leaf cassandra-name {
+                                                                type string;
+                                                                description "type of the database";
+                                                        }
+                                                        leaf cassandra-contact-points {
+                                                                type string;
+                                                                description "Cassandra takes a list of comma separated IP addresses to contact the cluster";
+                                                        }
+                                                        leaf cassandra-password {
+                                                                type string;
+                                                                description "the credentials of the account under which the server will access the database";
+                                                        }
+                                                        leaf cassandra-lfc-interval {
+                                                                type uint64;
+                                                                description "specifies the interval in seconds, at which the server will perform a
+                                                                lease file cleanup (LFC)";
+                                                        }
+                                                        leaf cassandra-connect-timeout {
+                                                                type uint64;
+                                                                description "If the database is located on a different system, a longer interval needs to be specified";
+                                                        }
+                                                }
+                                        }
+                                }
+                    uses dhcpv6-types:vendor-infor;
+        }
+
+            container option-sets {
+                description "DHCPv6 employs various options to carry additional
+          information and parameters in DHCP messages. This container defines
+          all the possible options that need to be configured at the server
+          side. ";
+        list option-set {
+                        key option-set-id;
+                        description "A server may allow different option sets to be
+                configured for different conditions (i.e. different networks,
+                clients and etc). This 'option-set' list enables various sets of
+                options being defined and configured in a single server. Different
+                sets are distinguished by the key called 'option-set-id'. All the
+                possible options discussed above are defined in the list and each
+                option is corresponding to a container. Since all the options in
+                the list are optional, each container in this list has a 'presence'
+                statement to indicate whether this option (container) will be
+                included in the current option set or not. In addition, each container
+                also has a 'if-feature' statement to indicate whether the server
+                supports this option (container).";
+            leaf option-set-id {
+                type uint32;
+                description "option set id";
+            }
+          uses dhcpv6-options:server-option-definitions;
+          uses dhcpv6-options:custom-option-definitions;
+        }
+            }
+
+            container network-ranges {
+        description "This model supports a hierarchy
+                to achieve dynamic configuration. That is to say we could configure the
+                server at different levels through this model. The top level is a global
+                level which is defined as the container 'network-ranges'. The following
+                levels are defined as sub-containers under it. The 'network-ranges'
+                contains the parameters (e.g. option-sets) that would be allocated to
+                all the clients served by this server.";
+
+        leaf option-set-id {
+          type leafref {
+            path "/server/server-config/option-sets/option-set/option-set-id";
+          }
+          description
+                "The ID field of relevant global option-set to be provisioned to
+                clients.";
+        }
+        list network-range {
+                key network-range-id;
+                description
+                "Under the 'network-ranges' container, a 'network-range' list
+                 is defined to configure the server at a network level which is also
+                 considered as the second level. Different network are identified by the
+                 key 'network-range-id'. This is because a server may have different
+           configuration parameters (e.g. option sets) for different networks.";
+                leaf network-range-id {
+                        type uint32;
+                        mandatory true;
+                        description "equivalent to subnet id";
+                }
+                leaf network-description {
+                        type string;
+                        mandatory true;
+                        description "description of the subnet";
+                }
+                leaf network-prefix {
+                        type inet:ipv6-prefix;
+                        mandatory true;
+                  description "subnet prefix";
+                }
+                leaf option-set-id {
+            type leafref {
+              path "/server/server-config/option-sets/option-set/option-set-id";
+            }
+            description "The ID field of relevant option-set to be provisioned to
+            clients of this network-range.";
+                }
+
+                container address-pools {
+            description
+            "A container that describes the DHCPv6 server's
+             address pools.";
+            list address-pool {
+                key pool-id;
+                description "A DHCPv6 server can be configured with
+                several address pools. This list defines such address pools
+                which are distinguished by the key called 'pool-id'.";
+                leaf pool-id {
+                        type uint32;
+                mandatory true;
+                description "pool id";
+                }
+                                leaf pool-prefix {
+                type inet:ipv6-prefix;
+                mandatory true;
+                description "pool prefix";
+                    }
+                leaf start-address {
+                type inet:ipv6-address-no-zone;
+                mandatory true;
+                description "start address";
+                }
+                leaf end-address {
+                type inet:ipv6-address-no-zone;
+                mandatory true;
+                description "end address";
+              }
+                leaf valid-lifetime {
+                type yang:timeticks;
+                mandatory true;
+                description "valid liftime for IA";
+                }
+                leaf renew-time {
+                type yang:timeticks;
+                mandatory true;
+                description "renew time";
+              }
+                leaf rebind-time {
+                type yang:timeticks;
+                mandatory true;
+                description "rebind time";
+                }
+                leaf preferred-lifetime {
+                      type yang:timeticks;
+                      mandatory true;
+                      description "preferred lifetime for IA";
+                }
+                leaf rapid-commit {
+                                        type boolean;
+                                        mandatory true;
+                                        description "A boolean value specifies whether the pool
+                                        supports client-server exchanges involving two messages.";
+                                        }
+              leaf client-class {
+                type string;
+                description
+                "If this leaf is specified, this pool will only serve
+                the clients belonging to this class.";
+              }
+                leaf max-address-count {
+                type threshold;
+                mandatory true;
+                description "maximum count of addresses that can
+                        be allocated in this pool. This value may be
+                        less than count of total addresses.";
+                }
+                leaf option-set-id {
+                type leafref {
+                        path "/server/server-config/option-sets/option-set/option-set-id";
+                }
+                mandatory true;
+                description "The ID field of relevant option-set to be
+                                provisioned to clients of this address-pool.";
+                }
+                  }
+                }
+
+                container pd-pools {
+            description "If a server supports prefix delegation function, this
+                container will be used to define  the delegating router's prefix
+                pools.";
+            list pd-pool {
+                key pool-id;
+                description "Similar to server's address pools, a delegating
+                        router can also be configured with multiple prefix pools
+                        specified by a list called 'prefix-pool'.";
+                                                        leaf pool-id {
+                        type uint32;
+                      mandatory true;
+                      description "pool id";
+                    }
+                    leaf prefix {
+                        type inet:ipv6-prefix;
+                        mandatory true;
+                        description "ipv6 prefix";
+                    }
+                    leaf prefix-length {
+                        type uint8;
+                        mandatory true;
+                        description "prefix length";
+                    }
+                    leaf valid-lifetime {
+                        type yang:timeticks;
+                mandatory true;
+                description "valid lifetime for IA";
+                    }
+                    leaf renew-time {
+                type yang:timeticks;
+                mandatory true;
+                description "renew time";
+                    }
+                leaf rebind-time {
+                type yang:timeticks;
+                mandatory true;
+                description "rebind time";
+                        }
+                    leaf preferred-lifetime {
+                type yang:timeticks;
+                mandatory true;
+                description "preferred lifetime for IA";
+                    }
+                leaf rapid-commit {
+                                        type boolean;
+                                        mandatory true;
+                                        description "A boolean value specifies whether the server
+                                        support client-server exchanges involving two messages defined.";
+                                        }
+                                        leaf client-class {
+                type string;
+                description "client class";
+              }
+                    leaf max-pd-space-utilization {
+                type threshold;
+                mandatory true;
+                description "Maximum utilization of pd space in this pool";
+                    }
+                    leaf option-set-id {
+                        type leafref {
+                                path "/server/server-config/option-sets/option-set/option-set-id";
+                        }
+                        mandatory true;
+                        description "The ID field of relevant option-set to be
+                          provisioned to clients of this prefix-pool.";
+                    }
+                  }
+                }
+
+          container host-reservations {
+            description
+                "This container allows the server to make reservations at host level.";
+            list host-reservation {
+              key cli-id;
+              description "This list allows the server to reserve addresses,
+              prefixes, hostname and options for different clients.";
+              leaf cli-id {
+                type uint32;
+                mandatory true;
+                description "client id";
+              }
+
+              choice client-identifier {
+                description "When making reservations, the server needs to choose a
+                identifier to identify the client. Currently 'DUID' and 'hardware
+                address' are supported.";
+                case duid {
+                  description "DUID";
+                  uses dhcpv6-types:duid;
+                }
+                case hw-address {
+                  description "hardware address";
+                  leaf hardware-address {
+                  type yang:mac-address;
+                  description "MAC address of client";
+                  }
+                }
+              }
+
+              leaf-list reserv-addr {
+                type inet:ipv6-address;
+                description "reserved addr";
+              }
+
+              list prefix-reservation {
+                key reserv-prefix-id;
+                description "reserved prefix reservation";
+                leaf reserv-prefix-id {
+                        type uint32;
+                        mandatory true;
+                        description "reserved prefix id";
+                }
+                leaf reserv-prefix {
+                        type inet:ipv6-prefix;
+                        mandatory true;
+                        description "reserved prefix";
+                      }
+                leaf reserv-prefix-len {
+                        type uint8;
+                        mandatory true;
+                        description "reserved prefix length";
+                }
+              }
+
+              leaf hostname {
+                type string;
+                description "reserved hostname";
+              }
+
+              leaf option-set-id {
+                type leafref {
+                  path "/server/server-config/option-sets/option-set/option-set-id";
+                }
+                description "The ID field of relevant option-set to be provisioned
+                  in the host reservation.";
+              }
+            }
+          }
+
+        }
+                        }
+
+        container relay-opaque-paras {
+        description "This container contains some opaque values in Relay Agent
+                options that need to be configured on the server side only for value
+                match. Such Relay Agent options include Interface-Id option,
+                Remote-Id option and Subscriber-Id option.";
+        list relays {
+                key relay-name;
+                description "relay agents";
+                leaf relay-name {
+                type string;
+                mandatory true;
+                description "relay agent name";
+          }
+                list interface-info {
+                key if-name;
+                description "interface info";
+                leaf if-name {
+                        type string;
+                        mandatory true;
+                        description "interface name";
+                }
+                leaf interface-id {
+                type string;
+                mandatory true;
+                        description "interface id";
+                }
+                }
+                list subscribers {
+                  key subscriber;
+                        description "subscribers";
+                        leaf subscriber {
+                                type uint32;
+                        mandatory true;
+                        description "subscriber";
+                  }
+                leaf subscriber-id {
+                type string;
+                        mandatory true;
+                        description "subscriber id";
+                }
+                }
+                list remote-host {
+                key ent-num;
+                description "remote host";
+                leaf ent-num {
+                        type uint32;
+                        mandatory true;
+                        description "enterprise number";
+                }
+                leaf remote-id {
+                        type string;
+                        mandatory true;
+                        description "remote id";
+                }
+                }
+              }
+                }
+
+            container rsoo-enabled-options {
+        description "rsoo enabled options";
+        list rsoo-enabled-option {
+                key option-code;
+                description "rsoo enabled option";
+                leaf option-code {
+                type uint16;
+                mandatory true;
+                description "option code";
+                }
+                leaf description {
+                type string;
+                mandatory true;
+                description "description of the option";
+                }
+        }
+            }
+
+                }
+
+          /*
+           * State data
+           */
+    container server-state {
+        config "false";
+        description "states of server";
+        container network-ranges {
+                description "This model supports a hierarchy to achieve dynamic configuration.
+                        That is to say we could configure the server  at different levels through
+                        this model. The top level is a global level which is defined as the container
+                        'network-ranges'. The following levels are defined as sub-containers under it.
+                        The 'network-ranges' contains the parameters (e.g. option-sets) that  would be
+                        allocated to all the clients served by this server.";
+                list network-range {
+                        key network-range-id;
+                description "The ID field of relevant option-set to be provisioned
+                        to clients of this network-range.";
+                        leaf network-range-id {
+                        type uint32;
+                        mandatory true;
+                        description "equivalent to subnet id";
+                }
+                container address-pools {
+                        description "A container that describes the DHCPv6 server's address pools";
+                        list address-pool {
+                                key pool-id;
+                                description "A DHCPv6 server can be configured with
+                                several address pools. This list defines such address pools
+                                which are distinguished by the key called 'pool-id'.";
+                leaf pool-id {
+                        type uint32;
+                        mandatory true;
+                        description "pool id";
+                    }
+                                        leaf total-address-count {
+                                                type uint64;
+                                                mandatory true;
+                                                description "count of total addresses in the pool";
+                                        }
+                                        leaf allocated-address-conut {
+                                                type uint64;
+                                                mandatory true;
+                                                description "count of allocated addresses in the pool";
+                                        }
+                        }
+                        list binding-info {
+                                key cli-id;
+                                description "A list that records a binding information for each DHCPv6
+                                        client that has already been allocated IPv6 addresses.";
+                                leaf cli-id {
+                                        type uint32;
+                                        mandatory true;
+                                        description "client id";
+                }
+                                container duid {
+                                        description "Read the DUID";
+                                        uses dhcpv6-types:duid;
+                }
+                                list cli-ia {
+                                        key iaid;
+                                        description "client IA";
+                                        leaf ia-type {
+                                                type string;
+                                                mandatory true;
+                                                description "IA type";
+                                        }
+                                        leaf iaid {
+                                                type uint32;
+                                                mandatory true;
+                                                description "IAID";
+                                        }
+                                        leaf-list cli-addr {
+                                                type inet:ipv6-address;
+                                                description "client addr";
+                                        }
+                                        leaf pool-id {
+                                                type uint32;
+                                                mandatory true;
+                                                description "pool id";
+                                        }
+                                }
+                        }
+                        }
+                        container pd-pools {
+                                description "If a server supports prefix delegation function,
+                                        this container will be used to define the delegating
+                                        router's prefix pools.";
+                                list prefix-pool {
+                key pool-id;
+                description "Similar to server's address pools, a delegating
+                        router can also be configured with multiple prefix pools
+                        specified by a list called 'prefix-pool'.";
+                leaf pool-id {
+                        type uint32;
+                        mandatory true;
+                        description "pool id";
+                }
+                leaf pd-space-utilization {
+                        type threshold;
+                        mandatory true;
+                        description "current PD space utilization";
+                }
+                                }
+                                list binding-info {
+                                        key cli-id;
+                                        description "A list records a binding information for each DHCPv6
+                                                client that has already been alloated IPv6 prefixes.";
+                                                leaf cli-id {
+                                                        type uint32;
+                                                        mandatory true;
+                                                        description "client id";
+                                                }
+                                                container duid {
+                                                        description "Reads the DUID";
+                                                        uses dhcpv6-types:duid;
+                                                }
+                                                list cli-iapd {
+                                                        key iaid;
+                                                        description "client IAPD";
+                                                        leaf iaid {
+                                                                type uint32;
+                                                                mandatory true;
+                                                                description "IAID";
+                                                        }
+                                                        leaf-list cli-prefix {
+                                                                type inet:ipv6-prefix;
+                                                                description "client ipv6 prefix";
+                                                        }
+                                                        leaf-list cli-prefix-len {
+                                                                type uint8;
+                                                                description "client prefix length";
+                                                        }
+                                                        leaf pool-id {
+                                                                type uint32;
+                                                                mandatory true;
+                                                                description "pool id";
+                                                        }
+                                                }
+                                }
+                        }
+
+                container host-reservations {
+            description "This container provides host reservations in the host level.";
+                                                list binding-info {
+                                key cli-id;
+                                description
+                                        "A list records a binding information for each DHCPv6
+                                        client that has already been alloated IPv6 addresses or prefixes
+                                        by host reservations.";
+                                        leaf cli-id {
+                                                type uint32;
+                                                mandatory true;
+                                                description "client id";
+                                        }
+                                        container duid {
+                                                description "Reads the DUID";
+                                                uses dhcpv6-types:duid;
+                                        }
+                                        list cli-ia {
+                                        key iaid;
+                                        description "client IA";
+                                        leaf ia-type {
+                                                type string;
+                                                mandatory true;
+                                                description "IA type, IA_NA or IA_TA";
+                                        }
+                                        leaf iaid {
+                                                type uint32;
+                                                mandatory true;
+                                                description "IAID";
+                                        }
+                                        leaf-list cli-addr {
+                                                type inet:ipv6-address;
+                                                description "client addr";
+                                        }
+                                }
+
+                                        list cli-iapd {
+                                                key iaid;
+                                                description "client IAPD";
+                                                leaf iaid {
+                                                        type uint32;
+                                                        mandatory true;
+                                                        description "IAID";
+                                                }
+                                                leaf-list cli-prefix {
+                                                        type inet:ipv6-prefix;
+                                                        description "client ipv6 prefix";
+                                                }
+                                                leaf-list cli-prefix-len {
+                                                        type uint8;
+                                                        description "client prefix length";
+                                                }
+                                        }
+                        }
+                }
+
+                                        }
+                        }
+
+        container packet-stats {
+                description "A container presents the packet statistics related to
+                        the DHCPv6 server.";
+          leaf solicit-count {
+                                                type uint32;
+                                                mandatory true;
+                                                description "solicit counter";
+          }
+          leaf request-count {
+                                                type uint32;
+                                                mandatory true;
+                                                description "request counter";
+          }
+          leaf renew-count {
+                                                type uint32;
+                                                mandatory true;
+                                                description "renew counter";
+          }
+          leaf rebind-count {
+                                                type uint32;
+                                                mandatory true;
+                                                description "rebind counter";
+          }
+          leaf decline-count {
+                                                type uint32;
+                                                mandatory true;
+                                                description "decline count";
+          }
+          leaf release-count {
+                type uint32;
+                mandatory true;
+                description "release counter";
+          }
+          leaf info-req-count {
+                type uint32;
+                mandatory true;
+                description "information request counter";
+          }
+          leaf advertise-count {
+                type uint32;
+                mandatory true;
+                description "advertise counter";
+          }
+          leaf confirm-count {
+                type uint32;
+                mandatory true;
+                description "confirm counter";
+          }
+          leaf reply-count {
+                                                type uint32;
+                                                mandatory true;
+                                                description "reply counter";
+          }
+          leaf reconfigure-count {
+                                                type uint32;
+                                                mandatory true;
+                                                description "reconfigure counter";
+          }
+          leaf relay-forward-count {
+                type uint32;
+                mandatory true;
+                description "relay forward counter";
+          }
+          leaf relay-reply-count {
+                type uint32;
+                mandatory true;
+                description "relay reply counter";
+          }
+        }
+        }
+        }
+
+        /*
+        * Notifications
+        */
+
+        notification notifications {
+          description "dhcpv6 server notification module";
+    container dhcpv6-server-event {
+        description "dhcpv6 server event";
+        container address-pool-running-out {
+        description "raised when the address pool is going to
+                run out.  A threshold for utilization ratio of the pool has
+                been defined in the server feature so that it will notify the
+                administrator when the utilization ratio reaches the
+                threshold, and such threshold is a settable parameter";
+        leaf total-address-count {
+                type uint64;
+                mandatory true;
+                description "count of total addresses in the pool";
+        }
+        leaf max-address-count {
+                type uint64;
+                mandatory true;
+                description "maximum count of addresses that can be allocated
+                        in the pool. This value may be less than count of total
+                        addresses";
+        }
+        leaf allocated-address-conut {
+                type uint64;
+                mandatory true;
+                description "count of allocated addresses in the pool";
+        }
+                    container duid {
+                        description "server duid";
+                        uses dhcpv6-types:duid;
+                    }
+        leaf serv-name {
+                type string;
+                description "server name";
+        }
+        leaf pool-name {
+                type string;
+                mandatory true;
+                description "pool name";
+        }
+        }
+                container pd-pool-running-out {
+        description "raised when the address/prefix pool is going to
+                run out.  A threshold for utilization ratio of the pool has
+                been defined in the server feature so that it will notify the
+                administrator when the utilization ratio reaches the
+                threshold, and such threshold is a settable parameter";
+                        leaf max-pd-space-utilization {
+                type threshold;
+                mandatory true;
+                description "maximum pd space utilization";
+                }
+                        leaf pd-space-utilization {
+                                type threshold;
+                                mandatory true;
+                                description "current pd space utilization";
+                        }
+        container duid {
+                description "Sets the DUID";
+                uses dhcpv6-types:duid;
+        }
+        leaf serv-name {
+                type string;
+                description "server name";
+        }
+        leaf pool-name {
+                type string;
+                mandatory true;
+                description "pool name";
+        }
+            }
+            container invalid-client-detected {
+                description "raised when the server has found a client which
+                can be regarded as a potential attacker. Some description
+                could also be included.";
+        container duid {
+                description "Sets the DUID";
+                uses dhcpv6-types:duid;
+        }
+        leaf description {
+                type string;
+                description "description of the event";
+                }
+            }
+          }
+        }
+}
diff --git a/src/share/yang/modules/ietf-dhcpv6-types@2018-09-04.yang b/src/share/yang/modules/ietf-dhcpv6-types@2018-09-04.yang
new file mode 100644
index 0000000..52feb28
--- /dev/null
+++ b/src/share/yang/modules/ietf-dhcpv6-types@2018-09-04.yang
@@ -0,0 +1,211 @@
+module ietf-dhcpv6-types {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-types";
+  prefix "dhcpv6-types";
+
+  import ietf-inet-types {
+    prefix inet;
+  }
+  import ietf-yang-types {
+    prefix yang;
+  }
+
+  organization "DHC WG";
+  contact
+   "cuiyong@tsinghua.edu.cn
+    lh.sunlinh@gmail.com
+    ian.farrer@telekom.de
+    sladjana.zechlin@telekom.de
+    hezihao9512@gmail.com";
+
+  description "This model defines a YANG data model that can be
+    used to define some commonly used DHCPv6 types";
+
+  revision 2018-09-04 {
+    description "";
+    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  revision 2018-01-30 {
+    description "Initial revision";
+    reference "I-D: draft-ietf-dhc-dhcpv6-yang";
+  }
+
+  /*
+  * Grouping
+  */
+  grouping vendor-infor {
+    description "Vendor information.";
+    container vendor-info {
+      description "";
+      leaf ent-num {
+        type uint32;
+        mandatory true;
+        description "enterprise number";
+      }
+      leaf-list data {
+        type string;
+        description "specific vendor info";
+      }
+    }
+  }
+
+  grouping duid {
+    description
+      "Each server and client has only one DUID (DHCP Unique Identifier).
+      The DUID here identifies a unique DHCPv6 server for clients. DUID
+      consists of a two-octet type field and an arbitrary length (no more
+      than 128 bytes) content field. Currently there are four defined types
+      of DUIDs in RFC3315 and RFC6355 - DUID-LLT, DUID-EN, DUID-LL and
+      DUID-UUID. DUID-Unknown represents those unconventional DUIDs.";
+    reference "RFC3315: Section 9 and RFC6355: Section 4";
+    leaf type-code {
+      type uint16;
+      default 65535;
+      description "Type code of this DUID";
+    }
+    choice duid-type {
+    default duid-unknown;
+      description "Selects the format for the DUID.";
+      case duid-llt {
+        description "DUID Based on Link-layer Address Plus Time
+          (Type 1 - DUID-LLT)";
+        reference "RFC3315 Section 9.2";
+        leaf duid-llt-hardware-type {
+          type uint16;
+          description "Hardware type as assigned by IANA (RFC826).";
+        }
+        leaf duid-llt-time {
+          type yang:timeticks;
+          description "The time value is the time that the DUID is
+          generated represented in seconds since midnight (UTC),
+          January 1, 2000, modulo 2^32.";
+        }
+        leaf duid-llt-link-layer-addr {
+          type yang:mac-address;
+          description "Link-layer address as described in RFC2464";
+        }
+      }
+      case duid-en {
+        description "DUID Assigned by Vendor Based on Enterprise Number
+          (Type 2 - DUID-EN)";
+        reference "RFC3315 Section 9.3";
+        leaf duid-en-enterprise-number {
+          type uint32;
+          description "Vendor's registered Private Enterprise Number as
+            maintained by IANA";
+        }
+        leaf duid-en-identifier {
+          type string;
+          description "Indentifier, unique to the device that is
+          using it";
+        }
+      }
+      case duid-ll {
+          description "DUID Based on Link-layer Address (Type 3 - DUID-LL)";
+          reference "RFC3315 Section 9.4";
+          leaf duid-ll-hardware-type {
+            type uint16;
+            description "Hardware type as assigned by IANA (RFC826).";
+          }
+          leaf duid-ll-link-layer-addr {
+            type yang:mac-address;
+            description "Link-layer address as described in RFC2464";
+        }
+      }
+      case duid-uuid {
+        description "DUID Based on Universally Unique Identifier
+          (Type 4 - DUID-UUID)";
+        reference "RFC6335 Defination of the UUID-Based Unique Identifier";
+        leaf uuid {
+          type yang:uuid;
+          description "A Universally Unique IDentifier in the string
+            representation defined in RFC 4122. The canonical
+            representation uses lowercase characters";
+        }
+      }
+      case duid-unknown {
+        description "DUID based on free raw bytes";
+        leaf data {
+          type binary;
+          description "The bits to be used as the identifier";
+        }
+      }
+    }
+  }
+
+  grouping portset-para {
+    description "portset parameters";
+    container port-parameter {
+      description "port parameter";
+      leaf offset {
+        type uint8;
+        mandatory true;
+        description "offset in a port set";
+      }
+      leaf psid-len {
+        type uint8;
+        mandatory true;
+        description "length of a psid";
+      }
+      leaf psid {
+        type uint16;
+        mandatory true;
+        description "psid value";
+      }
+    }
+  }
+
+  grouping iaid {
+    description "IA is a construct through which a server and a
+        client can identify, group, and manage a set of related IPv6
+        addresses. The key of the list is a 4-byte number IAID defined
+        in [RFC3315].";
+    list identity-association {
+      config "false";
+      description "IA";
+      leaf iaid {
+        type uint32;
+        mandatory true;
+        description "IAID";
+      }
+      leaf ia-type {
+        type string;
+        mandatory true;
+        description "IA type";
+      }
+      leaf-list ipv6-addr {
+        type inet:ipv6-address;
+        description "ipv6 address";
+      }
+      leaf-list ipv6-prefix {
+        type inet:ipv6-prefix;
+        description "ipv6 prefix";
+      }
+      leaf-list prefix-length {
+        type uint8;
+        description "ipv6 prefix length";
+      }
+      leaf t1-time {
+        type yang:timeticks;
+        mandatory true;
+        description "t1 time";
+      }
+      leaf t2-time {
+        type yang:timeticks;
+        mandatory true;
+        description "t2 time";
+      }
+      leaf preferred-lifetime {
+        type yang:timeticks;
+        mandatory true;
+        description "preferred lifetime";
+      }
+      leaf valid-lifetime {
+        type yang:timeticks;
+        mandatory true;
+        description "valid lifetime";
+      }
+    }
+  }
+}
diff --git a/src/share/yang/modules/ietf-inet-types@2013-07-15.yang b/src/share/yang/modules/ietf-inet-types@2013-07-15.yang
new file mode 100644
index 0000000..2f14270
--- /dev/null
+++ b/src/share/yang/modules/ietf-inet-types@2013-07-15.yang
@@ -0,0 +1,457 @@
+module ietf-inet-types {
+
+  namespace "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+  prefix "inet";
+
+  organization
+   "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+
+  contact
+   "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+
+  description
+   "This module contains a collection of generally useful derived
+    YANG data types for Internet addresses and related things.
+
+    Copyright (c) 2013 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+
+    This version of this YANG module is part of RFC 6991; see
+    the RFC itself for full legal notices.";
+
+  revision 2013-07-15 {
+    description
+     "This revision adds the following new data types:
+      - ip-address-no-zone
+      - ipv4-address-no-zone
+      - ipv6-address-no-zone";
+    reference
+     "RFC 6991: Common YANG Data Types";
+  }
+
+  revision 2010-09-24 {
+    description
+     "Initial revision.";
+    reference
+     "RFC 6021: Common YANG Data Types";
+  }
+
+  /*** collection of types related to protocol fields ***/
+
+  typedef ip-version {
+    type enumeration {
+      enum unknown {
+        value "0";
+        description
+         "An unknown or unspecified version of the Internet
+          protocol.";
+      }
+      enum ipv4 {
+        value "1";
+        description
+         "The IPv4 protocol as defined in RFC 791.";
+      }
+      enum ipv6 {
+        value "2";
+        description
+         "The IPv6 protocol as defined in RFC 2460.";
+      }
+    }
+    description
+     "This value represents the version of the IP protocol.
+
+      In the value set and its semantics, this type is equivalent
+      to the InetVersion textual convention of the SMIv2.";
+    reference
+     "RFC  791: Internet Protocol
+      RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
+      RFC 4001: Textual Conventions for Internet Network Addresses";
+  }
+
+  typedef dscp {
+    type uint8 {
+      range "0..63";
+    }
+    description
+     "The dscp type represents a Differentiated Services Code Point
+      that may be used for marking packets in a traffic stream.
+      In the value set and its semantics, this type is equivalent
+      to the Dscp textual convention of the SMIv2.";
+    reference
+     "RFC 3289: Management Information Base for the Differentiated
+                Services Architecture
+      RFC 2474: Definition of the Differentiated Services Field
+                (DS Field) in the IPv4 and IPv6 Headers
+      RFC 2780: IANA Allocation Guidelines For Values In
+                the Internet Protocol and Related Headers";
+  }
+
+  typedef ipv6-flow-label {
+    type uint32 {
+      range "0..1048575";
+    }
+    description
+     "The ipv6-flow-label type represents the flow identifier or Flow
+      Label in an IPv6 packet header that may be used to
+      discriminate traffic flows.
+
+      In the value set and its semantics, this type is equivalent
+      to the IPv6FlowLabel textual convention of the SMIv2.";
+    reference
+     "RFC 3595: Textual Conventions for IPv6 Flow Label
+      RFC 2460: Internet Protocol, Version 6 (IPv6) Specification";
+  }
+
+  typedef port-number {
+    type uint16 {
+      range "0..65535";
+    }
+    description
+     "The port-number type represents a 16-bit port number of an
+      Internet transport-layer protocol such as UDP, TCP, DCCP, or
+      SCTP.  Port numbers are assigned by IANA.  A current list of
+      all assignments is available from <http://www.iana.org/>.
+
+      Note that the port number value zero is reserved by IANA.  In
+      situations where the value zero does not make sense, it can
+      be excluded by subtyping the port-number type.
+      In the value set and its semantics, this type is equivalent
+      to the InetPortNumber textual convention of the SMIv2.";
+    reference
+     "RFC  768: User Datagram Protocol
+      RFC  793: Transmission Control Protocol
+      RFC 4960: Stream Control Transmission Protocol
+      RFC 4340: Datagram Congestion Control Protocol (DCCP)
+      RFC 4001: Textual Conventions for Internet Network Addresses";
+  }
+
+  /*** collection of types related to autonomous systems ***/
+
+  typedef as-number {
+    type uint32;
+    description
+     "The as-number type represents autonomous system numbers
+      which identify an Autonomous System (AS).  An AS is a set
+      of routers under a single technical administration, using
+      an interior gateway protocol and common metrics to route
+      packets within the AS, and using an exterior gateway
+      protocol to route packets to other ASes.  IANA maintains
+      the AS number space and has delegated large parts to the
+      regional registries.
+
+      Autonomous system numbers were originally limited to 16
+      bits.  BGP extensions have enlarged the autonomous system
+      number space to 32 bits.  This type therefore uses an uint32
+      base type without a range restriction in order to support
+      a larger autonomous system number space.
+
+      In the value set and its semantics, this type is equivalent
+      to the InetAutonomousSystemNumber textual convention of
+      the SMIv2.";
+    reference
+     "RFC 1930: Guidelines for creation, selection, and registration
+                of an Autonomous System (AS)
+      RFC 4271: A Border Gateway Protocol 4 (BGP-4)
+      RFC 4001: Textual Conventions for Internet Network Addresses
+      RFC 6793: BGP Support for Four-Octet Autonomous System (AS)
+                Number Space";
+  }
+
+  /*** collection of types related to IP addresses and hostnames ***/
+
+  typedef ip-address {
+    type union {
+      type inet:ipv4-address;
+      type inet:ipv6-address;
+    }
+    description
+     "The ip-address type represents an IP address and is IP
+      version neutral.  The format of the textual representation
+      implies the IP version.  This type supports scoped addresses
+      by allowing zone identifiers in the address format.";
+    reference
+     "RFC 4007: IPv6 Scoped Address Architecture";
+  }
+
+  typedef ipv4-address {
+    type string {
+      pattern
+        '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+      +  '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
+      + '(%[\p{N}\p{L}]+)?';
+    }
+    description
+      "The ipv4-address type represents an IPv4 address in
+       dotted-quad notation.  The IPv4 address may include a zone
+       index, separated by a % sign.
+
+       The zone index is used to disambiguate identical address
+       values.  For link-local addresses, the zone index will
+       typically be the interface index number or the name of an
+       interface.  If the zone index is not present, the default
+       zone of the device will be used.
+
+       The canonical format for the zone index is the numerical
+       format";
+  }
+
+  typedef ipv6-address {
+    type string {
+      pattern '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}'
+            + '((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|'
+            + '(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}'
+            + '(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))'
+            + '(%[\p{N}\p{L}]+)?';
+      pattern '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|'
+            + '((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)'
+            + '(%.+)?';
+    }
+    description
+     "The ipv6-address type represents an IPv6 address in full,
+      mixed, shortened, and shortened-mixed notation.  The IPv6
+      address may include a zone index, separated by a % sign.
+
+      The zone index is used to disambiguate identical address
+      values.  For link-local addresses, the zone index will
+      typically be the interface index number or the name of an
+      interface.  If the zone index is not present, the default
+      zone of the device will be used.
+
+      The canonical format of IPv6 addresses uses the textual
+      representation defined in Section 4 of RFC 5952.  The
+      canonical format for the zone index is the numerical
+      format as described in Section 11.2 of RFC 4007.";
+    reference
+     "RFC 4291: IP Version 6 Addressing Architecture
+      RFC 4007: IPv6 Scoped Address Architecture
+      RFC 5952: A Recommendation for IPv6 Address Text
+                Representation";
+  }
+
+  typedef ip-address-no-zone {
+    type union {
+      type inet:ipv4-address-no-zone;
+      type inet:ipv6-address-no-zone;
+    }
+    description
+     "The ip-address-no-zone type represents an IP address and is
+      IP version neutral.  The format of the textual representation
+      implies the IP version.  This type does not support scoped
+      addresses since it does not allow zone identifiers in the
+      address format.";
+    reference
+     "RFC 4007: IPv6 Scoped Address Architecture";
+  }
+
+  typedef ipv4-address-no-zone {
+    type inet:ipv4-address {
+      pattern '[0-9\.]*';
+    }
+    description
+      "An IPv4 address without a zone index.  This type, derived from
+       ipv4-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+  }
+
+  typedef ipv6-address-no-zone {
+    type inet:ipv6-address {
+      pattern '[0-9a-fA-F:\.]*';
+    }
+    description
+      "An IPv6 address without a zone index.  This type, derived from
+       ipv6-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+    reference
+     "RFC 4291: IP Version 6 Addressing Architecture
+      RFC 4007: IPv6 Scoped Address Architecture
+      RFC 5952: A Recommendation for IPv6 Address Text
+                Representation";
+  }
+
+  typedef ip-prefix {
+    type union {
+      type inet:ipv4-prefix;
+      type inet:ipv6-prefix;
+    }
+    description
+     "The ip-prefix type represents an IP prefix and is IP
+      version neutral.  The format of the textual representations
+      implies the IP version.";
+  }
+
+  typedef ipv4-prefix {
+    type string {
+      pattern
+         '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+       +  '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])'
+       + '/(([0-9])|([1-2][0-9])|(3[0-2]))';
+    }
+    description
+     "The ipv4-prefix type represents an IPv4 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 32.
+
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+
+      The canonical format of an IPv4 prefix has all bits of
+      the IPv4 address set to zero that are not part of the
+      IPv4 prefix.";
+  }
+
+  typedef ipv6-prefix {
+    type string {
+      pattern '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}'
+            + '((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|'
+            + '(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}'
+            + '(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))'
+            + '(/(([0-9])|([0-9]{2})|(1[0-1][0-9])|(12[0-8])))';
+      pattern '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|'
+            + '((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)'
+            + '(/.+)';
+    }
+    description
+     "The ipv6-prefix type represents an IPv6 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 128.
+
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+
+      The IPv6 address should have all bits that do not belong
+      to the prefix set to zero.
+
+      The canonical format of an IPv6 prefix has all bits of
+      the IPv6 address set to zero that are not part of the
+      IPv6 prefix.  Furthermore, the IPv6 address is represented
+      as defined in Section 4 of RFC 5952.";
+    reference
+     "RFC 5952: A Recommendation for IPv6 Address Text
+                Representation";
+  }
+
+  /*** collection of domain name and URI types ***/
+
+  typedef domain-name {
+    type string {
+      length "1..253";
+      pattern
+        '((([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.)*'
+      + '([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.?)'
+      + '|\.';
+    }
+    description
+     "The domain-name type represents a DNS domain name.  The
+      name SHOULD be fully qualified whenever possible.
+
+      Internet domain names are only loosely specified.  Section
+      3.5 of RFC 1034 recommends a syntax (modified in Section
+      2.1 of RFC 1123).  The pattern above is intended to allow
+      for current practice in domain name use, and some possible
+      future expansion.  It is designed to hold various types of
+      domain names, including names used for A or AAAA records
+      (host names) and other records, such as SRV records.  Note
+      that Internet host names have a stricter syntax (described
+      in RFC 952) than the DNS recommendations in RFCs 1034 and
+      1123, and that systems that want to store host names in
+      schema nodes using the domain-name type are recommended to
+      adhere to this stricter standard to ensure interoperability.
+
+      The encoding of DNS names in the DNS protocol is limited
+      to 255 characters.  Since the encoding consists of labels
+      prefixed by a length bytes and there is a trailing NULL
+      byte, only 253 characters can appear in the textual dotted
+      notation.
+
+      The description clause of schema nodes using the domain-name
+      type MUST describe when and how these names are resolved to
+      IP addresses.  Note that the resolution of a domain-name value
+      may require to query multiple DNS records (e.g., A for IPv4
+      and AAAA for IPv6).  The order of the resolution process and
+      which DNS record takes precedence can either be defined
+      explicitly or may depend on the configuration of the
+      resolver.
+
+      Domain-name values use the US-ASCII encoding.  Their canonical
+      format uses lowercase US-ASCII characters.  Internationalized
+      domain names MUST be A-labels as per RFC 5890.";
+    reference
+     "RFC  952: DoD Internet Host Table Specification
+      RFC 1034: Domain Names - Concepts and Facilities
+      RFC 1123: Requirements for Internet Hosts -- Application
+                and Support
+      RFC 2782: A DNS RR for specifying the location of services
+                (DNS SRV)
+      RFC 5890: Internationalized Domain Names in Applications
+                (IDNA): Definitions and Document Framework";
+  }
+
+  typedef host {
+    type union {
+      type inet:ip-address;
+      type inet:domain-name;
+    }
+    description
+     "The host type represents either an IP address or a DNS
+      domain name.";
+  }
+
+  typedef uri {
+    type string;
+    description
+     "The uri type represents a Uniform Resource Identifier
+      (URI) as defined by STD 66.
+
+      Objects using the uri type MUST be in US-ASCII encoding,
+      and MUST be normalized as described by RFC 3986 Sections
+      6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
+      percent-encoding is removed, and all case-insensitive
+      characters are set to lowercase except for hexadecimal
+      digits, which are normalized to uppercase as described in
+      Section 6.2.2.1.
+
+      The purpose of this normalization is to help provide
+      unique URIs.  Note that this normalization is not
+      sufficient to provide uniqueness.  Two URIs that are
+      textually distinct after this normalization may still be
+      equivalent.
+
+      Objects using the uri type may restrict the schemes that
+      they permit.  For example, 'data:' and 'urn:' schemes
+      might not be appropriate.
+
+      A zero-length URI is not a valid URI.  This can be used to
+      express 'URI absent' where required.
+
+      In the value set and its semantics, this type is equivalent
+      to the Uri SMIv2 textual convention defined in RFC 5017.";
+    reference
+     "RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
+      RFC 3305: Report from the Joint W3C/IETF URI Planning Interest
+                Group: Uniform Resource Identifiers (URIs), URLs,
+                and Uniform Resource Names (URNs): Clarifications
+                and Recommendations
+      RFC 5017: MIB Textual Conventions for Uniform Resource
+                Identifiers (URIs)";
+  }
+
+}
diff --git a/src/share/yang/modules/ietf-interfaces@2018-02-20.yang b/src/share/yang/modules/ietf-interfaces@2018-02-20.yang
new file mode 100644
index 0000000..f66c205
--- /dev/null
+++ b/src/share/yang/modules/ietf-interfaces@2018-02-20.yang
@@ -0,0 +1,1123 @@
+module ietf-interfaces {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:ietf-interfaces";
+  prefix if;
+
+  import ietf-yang-types {
+    prefix yang;
+  }
+
+  organization
+    "IETF NETMOD (Network Modeling) Working Group";
+
+  contact
+    "WG Web:   <https://datatracker.ietf.org/wg/netmod/>
+     WG List:  <mailto:netmod@ietf.org>
+
+     Editor:   Martin Bjorklund
+               <mailto:mbj@tail-f.com>";
+
+  description
+    "This module contains a collection of YANG definitions for
+     managing network interfaces.
+
+     Copyright (c) 2018 IETF Trust and the persons identified as
+     authors of the code.  All rights reserved.
+
+     Redistribution and use in source and binary forms, with or
+     without modification, is permitted pursuant to, and subject
+     to the license terms contained in, the Simplified BSD License
+     set forth in Section 4.c of the IETF Trust's Legal Provisions
+     Relating to IETF Documents
+     (https://trustee.ietf.org/license-info).
+
+     This version of this YANG module is part of RFC 8343; see
+     the RFC itself for full legal notices.";
+
+  revision 2018-02-20 {
+    description
+      "Updated to support NMDA.";
+    reference
+      "RFC 8343: A YANG Data Model for Interface Management";
+  }
+
+  revision 2014-05-08 {
+    description
+      "Initial revision.";
+    reference
+      "RFC 7223: A YANG Data Model for Interface Management";
+  }
+
+  /*
+   * Typedefs
+   */
+
+  typedef interface-ref {
+    type leafref {
+      path "/if:interfaces/if:interface/if:name";
+    }
+    description
+      "This type is used by data models that need to reference
+       interfaces.";
+  }
+
+  /*
+   * Identities
+   */
+
+  identity interface-type {
+    description
+      "Base identity from which specific interface types are
+       derived.";
+  }
+
+  /*
+   * Features
+   */
+
+  feature arbitrary-names {
+    description
+      "This feature indicates that the device allows user-controlled
+       interfaces to be named arbitrarily.";
+  }
+  feature pre-provisioning {
+    description
+      "This feature indicates that the device supports
+       pre-provisioning of interface configuration, i.e., it is
+       possible to configure an interface whose physical interface
+       hardware is not present on the device.";
+  }
+  feature if-mib {
+    description
+      "This feature indicates that the device implements
+       the IF-MIB.";
+    reference
+      "RFC 2863: The Interfaces Group MIB";
+  }
+
+  /*
+   * Data nodes
+   */
+
+  container interfaces {
+    description
+      "Interface parameters.";
+
+    list interface {
+      key "name";
+
+      description
+        "The list of interfaces on the device.
+
+         The status of an interface is available in this list in the
+         operational state.  If the configuration of a
+         system-controlled interface cannot be used by the system
+         (e.g., the interface hardware present does not match the
+         interface type), then the configuration is not applied to
+         the system-controlled interface shown in the operational
+         state.  If the configuration of a user-controlled interface
+         cannot be used by the system, the configured interface is
+         not instantiated in the operational state.
+
+         System-controlled interfaces created by the system are
+         always present in this list in the operational state,
+         whether or not they are configured.";
+
+     leaf name {
+        type string;
+        description
+          "The name of the interface.
+
+           A device MAY restrict the allowed values for this leaf,
+           possibly depending on the type of the interface.
+           For system-controlled interfaces, this leaf is the
+           device-specific name of the interface.
+
+           If a client tries to create configuration for a
+           system-controlled interface that is not present in the
+           operational state, the server MAY reject the request if
+           the implementation does not support pre-provisioning of
+           interfaces or if the name refers to an interface that can
+           never exist in the system.  A Network Configuration
+           Protocol (NETCONF) server MUST reply with an rpc-error
+           with the error-tag 'invalid-value' in this case.
+
+           If the device supports pre-provisioning of interface
+           configuration, the 'pre-provisioning' feature is
+           advertised.
+
+           If the device allows arbitrarily named user-controlled
+           interfaces, the 'arbitrary-names' feature is advertised.
+
+           When a configured user-controlled interface is created by
+           the system, it is instantiated with the same name in the
+           operational state.
+
+           A server implementation MAY map this leaf to the ifName
+           MIB object.  Such an implementation needs to use some
+           mechanism to handle the differences in size and characters
+           allowed between this leaf and ifName.  The definition of
+           such a mechanism is outside the scope of this document.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifName";
+      }
+
+      leaf description {
+        type string;
+        description
+          "A textual description of the interface.
+
+           A server implementation MAY map this leaf to the ifAlias
+           MIB object.  Such an implementation needs to use some
+           mechanism to handle the differences in size and characters
+           allowed between this leaf and ifAlias.  The definition of
+           such a mechanism is outside the scope of this document.
+
+           Since ifAlias is defined to be stored in non-volatile
+           storage, the MIB implementation MUST map ifAlias to the
+           value of 'description' in the persistently stored
+           configuration.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifAlias";
+      }
+
+      leaf type {
+        type identityref {
+          base interface-type;
+        }
+        mandatory true;
+        description
+          "The type of the interface.
+
+           When an interface entry is created, a server MAY
+           initialize the type leaf with a valid value, e.g., if it
+           is possible to derive the type from the name of the
+           interface.
+
+           If a client tries to set the type of an interface to a
+           value that can never be used by the system, e.g., if the
+           type is not supported or if the type does not match the
+           name of the interface, the server MUST reject the request.
+           A NETCONF server MUST reply with an rpc-error with the
+           error-tag 'invalid-value' in this case.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifType";
+      }
+
+      leaf enabled {
+        type boolean;
+        default "true";
+        description
+          "This leaf contains the configured, desired state of the
+           interface.
+
+           Systems that implement the IF-MIB use the value of this
+           leaf in the intended configuration to set
+           IF-MIB.ifAdminStatus to 'up' or 'down' after an ifEntry
+           has been initialized, as described in RFC 2863.
+
+           Changes in this leaf in the intended configuration are
+           reflected in ifAdminStatus.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifAdminStatus";
+      }
+
+      leaf link-up-down-trap-enable {
+        if-feature if-mib;
+        type enumeration {
+          enum enabled {
+            value 1;
+            description
+              "The device will generate linkUp/linkDown SNMP
+               notifications for this interface.";
+          }
+          enum disabled {
+            value 2;
+            description
+              "The device will not generate linkUp/linkDown SNMP
+               notifications for this interface.";
+          }
+        }
+        description
+          "Controls whether linkUp/linkDown SNMP notifications
+           should be generated for this interface.
+
+           If this node is not configured, the value 'enabled' is
+           operationally used by the server for interfaces that do
+           not operate on top of any other interface (i.e., there are
+           no 'lower-layer-if' entries), and 'disabled' otherwise.";
+        reference
+          "RFC 2863: The Interfaces Group MIB -
+                     ifLinkUpDownTrapEnable";
+      }
+
+      leaf admin-status {
+        if-feature if-mib;
+        type enumeration {
+          enum up {
+            value 1;
+            description
+              "Ready to pass packets.";
+          }
+          enum down {
+            value 2;
+            description
+              "Not ready to pass packets and not in some test mode.";
+          }
+          enum testing {
+            value 3;
+            description
+              "In some test mode.";
+          }
+        }
+        config false;
+        mandatory true;
+        description
+          "The desired state of the interface.
+
+           This leaf has the same read semantics as ifAdminStatus.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifAdminStatus";
+      }
+
+      leaf oper-status {
+        type enumeration {
+          enum up {
+            value 1;
+            description
+              "Ready to pass packets.";
+          }
+          enum down {
+            value 2;
+
+            description
+              "The interface does not pass any packets.";
+          }
+          enum testing {
+            value 3;
+            description
+              "In some test mode.  No operational packets can
+               be passed.";
+          }
+          enum unknown {
+            value 4;
+            description
+              "Status cannot be determined for some reason.";
+          }
+          enum dormant {
+            value 5;
+            description
+              "Waiting for some external event.";
+          }
+          enum not-present {
+            value 6;
+            description
+              "Some component (typically hardware) is missing.";
+          }
+          enum lower-layer-down {
+            value 7;
+            description
+              "Down due to state of lower-layer interface(s).";
+          }
+        }
+        config false;
+        mandatory true;
+        description
+          "The current operational state of the interface.
+
+           This leaf has the same semantics as ifOperStatus.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifOperStatus";
+      }
+
+      leaf last-change {
+        type yang:date-and-time;
+        config false;
+        description
+          "The time the interface entered its current operational
+           state.  If the current state was entered prior to the
+           last re-initialization of the local network management
+           subsystem, then this node is not present.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifLastChange";
+      }
+
+      leaf if-index {
+        if-feature if-mib;
+        type int32 {
+          range "1..2147483647";
+        }
+        config false;
+        mandatory true;
+        description
+          "The ifIndex value for the ifEntry represented by this
+           interface.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifIndex";
+      }
+
+      leaf phys-address {
+        type yang:phys-address;
+        config false;
+        description
+          "The interface's address at its protocol sub-layer.  For
+           example, for an 802.x interface, this object normally
+           contains a Media Access Control (MAC) address.  The
+           interface's media-specific modules must define the bit
+           and byte ordering and the format of the value of this
+           object.  For interfaces that do not have such an address
+           (e.g., a serial line), this node is not present.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifPhysAddress";
+      }
+
+      leaf-list higher-layer-if {
+        type interface-ref;
+        config false;
+        description
+          "A list of references to interfaces layered on top of this
+           interface.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifStackTable";
+      }
+
+      leaf-list lower-layer-if {
+        type interface-ref;
+        config false;
+
+        description
+          "A list of references to interfaces layered underneath this
+           interface.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifStackTable";
+      }
+
+      leaf speed {
+        type yang:gauge64;
+        units "bits/second";
+        config false;
+        description
+            "An estimate of the interface's current bandwidth in bits
+             per second.  For interfaces that do not vary in
+             bandwidth or for those where no accurate estimation can
+             be made, this node should contain the nominal bandwidth.
+             For interfaces that have no concept of bandwidth, this
+             node is not present.";
+        reference
+          "RFC 2863: The Interfaces Group MIB -
+                     ifSpeed, ifHighSpeed";
+      }
+
+      container statistics {
+        config false;
+        description
+          "A collection of interface-related statistics objects.";
+
+        leaf discontinuity-time {
+          type yang:date-and-time;
+          mandatory true;
+          description
+            "The time on the most recent occasion at which any one or
+             more of this interface's counters suffered a
+             discontinuity.  If no such discontinuities have occurred
+             since the last re-initialization of the local management
+             subsystem, then this node contains the time the local
+             management subsystem re-initialized itself.";
+        }
+
+        leaf in-octets {
+          type yang:counter64;
+          description
+            "The total number of octets received on the interface,
+             including framing characters.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCInOctets";
+        }
+
+        leaf in-unicast-pkts {
+          type yang:counter64;
+          description
+            "The number of packets, delivered by this sub-layer to a
+             higher (sub-)layer, that were not addressed to a
+             multicast or broadcast address at this sub-layer.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCInUcastPkts";
+        }
+
+        leaf in-broadcast-pkts {
+          type yang:counter64;
+          description
+            "The number of packets, delivered by this sub-layer to a
+             higher (sub-)layer, that were addressed to a broadcast
+             address at this sub-layer.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCInBroadcastPkts";
+        }
+
+        leaf in-multicast-pkts {
+          type yang:counter64;
+          description
+            "The number of packets, delivered by this sub-layer to a
+             higher (sub-)layer, that were addressed to a multicast
+             address at this sub-layer.  For a MAC-layer protocol,
+             this includes both Group and Functional addresses.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCInMulticastPkts";
+        }
+
+        leaf in-discards {
+          type yang:counter32;
+          description
+            "The number of inbound packets that were chosen to be
+             discarded even though no errors had been detected to
+             prevent their being deliverable to a higher-layer
+             protocol.  One possible reason for discarding such a
+             packet could be to free up buffer space.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifInDiscards";
+        }
+
+        leaf in-errors {
+          type yang:counter32;
+          description
+            "For packet-oriented interfaces, the number of inbound
+             packets that contained errors preventing them from being
+             deliverable to a higher-layer protocol.  For character-
+             oriented or fixed-length interfaces, the number of
+             inbound transmission units that contained errors
+             preventing them from being deliverable to a higher-layer
+             protocol.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifInErrors";
+        }
+
+        leaf in-unknown-protos {
+          type yang:counter32;
+
+          description
+            "For packet-oriented interfaces, the number of packets
+             received via the interface that were discarded because
+             of an unknown or unsupported protocol.  For
+             character-oriented or fixed-length interfaces that
+             support protocol multiplexing, the number of
+             transmission units received via the interface that were
+             discarded because of an unknown or unsupported protocol.
+             For any interface that does not support protocol
+             multiplexing, this counter is not present.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifInUnknownProtos";
+        }
+
+        leaf out-octets {
+          type yang:counter64;
+          description
+            "The total number of octets transmitted out of the
+             interface, including framing characters.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCOutOctets";
+        }
+
+        leaf out-unicast-pkts {
+          type yang:counter64;
+          description
+            "The total number of packets that higher-level protocols
+             requested be transmitted and that were not addressed
+             to a multicast or broadcast address at this sub-layer,
+             including those that were discarded or not sent.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCOutUcastPkts";
+        }
+
+        leaf out-broadcast-pkts {
+          type yang:counter64;
+          description
+            "The total number of packets that higher-level protocols
+             requested be transmitted and that were addressed to a
+             broadcast address at this sub-layer, including those
+             that were discarded or not sent.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCOutBroadcastPkts";
+        }
+
+        leaf out-multicast-pkts {
+          type yang:counter64;
+          description
+            "The total number of packets that higher-level protocols
+             requested be transmitted and that were addressed to a
+             multicast address at this sub-layer, including those
+             that were discarded or not sent.  For a MAC-layer
+             protocol, this includes both Group and Functional
+             addresses.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCOutMulticastPkts";
+        }
+
+        leaf out-discards {
+          type yang:counter32;
+          description
+            "The number of outbound packets that were chosen to be
+             discarded even though no errors had been detected to
+             prevent their being transmitted.  One possible reason
+             for discarding such a packet could be to free up buffer
+             space.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifOutDiscards";
+        }
+
+        leaf out-errors {
+          type yang:counter32;
+          description
+            "For packet-oriented interfaces, the number of outbound
+             packets that could not be transmitted because of errors.
+             For character-oriented or fixed-length interfaces, the
+             number of outbound transmission units that could not be
+             transmitted because of errors.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifOutErrors";
+        }
+      }
+
+    }
+  }
+
+  /*
+   * Legacy typedefs
+   */
+
+  typedef interface-state-ref {
+    type leafref {
+      path "/if:interfaces-state/if:interface/if:name";
+    }
+    status deprecated;
+    description
+      "This type is used by data models that need to reference
+       the operationally present interfaces.";
+  }
+
+  /*
+   * Legacy operational state data nodes
+   */
+
+  container interfaces-state {
+    config false;
+    status deprecated;
+    description
+      "Data nodes for the operational state of interfaces.";
+
+    list interface {
+      key "name";
+      status deprecated;
+
+      description
+        "The list of interfaces on the device.
+
+         System-controlled interfaces created by the system are
+         always present in this list, whether or not they are
+         configured.";
+
+      leaf name {
+        type string;
+        status deprecated;
+        description
+          "The name of the interface.
+
+           A server implementation MAY map this leaf to the ifName
+           MIB object.  Such an implementation needs to use some
+           mechanism to handle the differences in size and characters
+           allowed between this leaf and ifName.  The definition of
+           such a mechanism is outside the scope of this document.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifName";
+      }
+
+      leaf type {
+        type identityref {
+          base interface-type;
+        }
+        mandatory true;
+        status deprecated;
+        description
+          "The type of the interface.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifType";
+      }
+
+      leaf admin-status {
+        if-feature if-mib;
+        type enumeration {
+          enum up {
+            value 1;
+            description
+              "Ready to pass packets.";
+          }
+          enum down {
+            value 2;
+            description
+              "Not ready to pass packets and not in some test mode.";
+          }
+          enum testing {
+            value 3;
+            description
+              "In some test mode.";
+          }
+        }
+        mandatory true;
+        status deprecated;
+        description
+          "The desired state of the interface.
+
+           This leaf has the same read semantics as ifAdminStatus.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifAdminStatus";
+      }
+
+      leaf oper-status {
+        type enumeration {
+          enum up {
+            value 1;
+            description
+              "Ready to pass packets.";
+          }
+          enum down {
+            value 2;
+            description
+              "The interface does not pass any packets.";
+          }
+          enum testing {
+            value 3;
+            description
+              "In some test mode.  No operational packets can
+               be passed.";
+          }
+          enum unknown {
+            value 4;
+            description
+              "Status cannot be determined for some reason.";
+          }
+          enum dormant {
+            value 5;
+            description
+              "Waiting for some external event.";
+          }
+          enum not-present {
+            value 6;
+            description
+              "Some component (typically hardware) is missing.";
+          }
+          enum lower-layer-down {
+            value 7;
+            description
+              "Down due to state of lower-layer interface(s).";
+          }
+        }
+        mandatory true;
+        status deprecated;
+        description
+          "The current operational state of the interface.
+
+           This leaf has the same semantics as ifOperStatus.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifOperStatus";
+      }
+
+      leaf last-change {
+        type yang:date-and-time;
+        status deprecated;
+        description
+          "The time the interface entered its current operational
+           state.  If the current state was entered prior to the
+           last re-initialization of the local network management
+           subsystem, then this node is not present.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifLastChange";
+      }
+
+      leaf if-index {
+        if-feature if-mib;
+        type int32 {
+          range "1..2147483647";
+        }
+        mandatory true;
+        status deprecated;
+        description
+          "The ifIndex value for the ifEntry represented by this
+           interface.";
+
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifIndex";
+      }
+
+      leaf phys-address {
+        type yang:phys-address;
+        status deprecated;
+        description
+          "The interface's address at its protocol sub-layer.  For
+           example, for an 802.x interface, this object normally
+           contains a Media Access Control (MAC) address.  The
+           interface's media-specific modules must define the bit
+           and byte ordering and the format of the value of this
+           object.  For interfaces that do not have such an address
+           (e.g., a serial line), this node is not present.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifPhysAddress";
+      }
+
+      leaf-list higher-layer-if {
+        type interface-state-ref;
+        status deprecated;
+        description
+          "A list of references to interfaces layered on top of this
+           interface.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifStackTable";
+      }
+
+      leaf-list lower-layer-if {
+        type interface-state-ref;
+        status deprecated;
+        description
+          "A list of references to interfaces layered underneath this
+           interface.";
+        reference
+          "RFC 2863: The Interfaces Group MIB - ifStackTable";
+      }
+
+      leaf speed {
+        type yang:gauge64;
+        units "bits/second";
+        status deprecated;
+        description
+            "An estimate of the interface's current bandwidth in bits
+             per second.  For interfaces that do not vary in
+             bandwidth or for those where no accurate estimation can
+
+             be made, this node should contain the nominal bandwidth.
+             For interfaces that have no concept of bandwidth, this
+             node is not present.";
+        reference
+          "RFC 2863: The Interfaces Group MIB -
+                     ifSpeed, ifHighSpeed";
+      }
+
+      container statistics {
+        status deprecated;
+        description
+          "A collection of interface-related statistics objects.";
+
+        leaf discontinuity-time {
+          type yang:date-and-time;
+          mandatory true;
+          status deprecated;
+          description
+            "The time on the most recent occasion at which any one or
+             more of this interface's counters suffered a
+             discontinuity.  If no such discontinuities have occurred
+             since the last re-initialization of the local management
+             subsystem, then this node contains the time the local
+             management subsystem re-initialized itself.";
+        }
+
+        leaf in-octets {
+          type yang:counter64;
+          status deprecated;
+          description
+            "The total number of octets received on the interface,
+             including framing characters.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCInOctets";
+        }
+
+        leaf in-unicast-pkts {
+          type yang:counter64;
+          status deprecated;
+          description
+            "The number of packets, delivered by this sub-layer to a
+             higher (sub-)layer, that were not addressed to a
+             multicast or broadcast address at this sub-layer.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCInUcastPkts";
+        }
+
+        leaf in-broadcast-pkts {
+          type yang:counter64;
+          status deprecated;
+          description
+            "The number of packets, delivered by this sub-layer to a
+             higher (sub-)layer, that were addressed to a broadcast
+             address at this sub-layer.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCInBroadcastPkts";
+        }
+
+        leaf in-multicast-pkts {
+          type yang:counter64;
+          status deprecated;
+          description
+            "The number of packets, delivered by this sub-layer to a
+             higher (sub-)layer, that were addressed to a multicast
+             address at this sub-layer.  For a MAC-layer protocol,
+             this includes both Group and Functional addresses.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCInMulticastPkts";
+        }
+
+        leaf in-discards {
+          type yang:counter32;
+          status deprecated;
+
+          description
+            "The number of inbound packets that were chosen to be
+             discarded even though no errors had been detected to
+             prevent their being deliverable to a higher-layer
+             protocol.  One possible reason for discarding such a
+             packet could be to free up buffer space.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifInDiscards";
+        }
+
+        leaf in-errors {
+          type yang:counter32;
+          status deprecated;
+          description
+            "For packet-oriented interfaces, the number of inbound
+             packets that contained errors preventing them from being
+             deliverable to a higher-layer protocol.  For character-
+             oriented or fixed-length interfaces, the number of
+             inbound transmission units that contained errors
+             preventing them from being deliverable to a higher-layer
+             protocol.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifInErrors";
+        }
+
+        leaf in-unknown-protos {
+          type yang:counter32;
+          status deprecated;
+          description
+            "For packet-oriented interfaces, the number of packets
+             received via the interface that were discarded because
+             of an unknown or unsupported protocol.  For
+             character-oriented or fixed-length interfaces that
+             support protocol multiplexing, the number of
+             transmission units received via the interface that were
+             discarded because of an unknown or unsupported protocol.
+             For any interface that does not support protocol
+             multiplexing, this counter is not present.
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifInUnknownProtos";
+        }
+
+        leaf out-octets {
+          type yang:counter64;
+          status deprecated;
+          description
+            "The total number of octets transmitted out of the
+             interface, including framing characters.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCOutOctets";
+        }
+
+        leaf out-unicast-pkts {
+          type yang:counter64;
+          status deprecated;
+          description
+            "The total number of packets that higher-level protocols
+             requested be transmitted and that were not addressed
+             to a multicast or broadcast address at this sub-layer,
+             including those that were discarded or not sent.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifHCOutUcastPkts";
+        }
+
+        leaf out-broadcast-pkts {
+          type yang:counter64;
+          status deprecated;
+
+          description
+            "The total number of packets that higher-level protocols
+             requested be transmitted and that were addressed to a
+             broadcast address at this sub-layer, including those
+             that were discarded or not sent.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCOutBroadcastPkts";
+        }
+
+        leaf out-multicast-pkts {
+          type yang:counter64;
+          status deprecated;
+          description
+            "The total number of packets that higher-level protocols
+             requested be transmitted and that were addressed to a
+             multicast address at this sub-layer, including those
+             that were discarded or not sent.  For a MAC-layer
+             protocol, this includes both Group and Functional
+             addresses.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB -
+                       ifHCOutMulticastPkts";
+        }
+
+        leaf out-discards {
+          type yang:counter32;
+          status deprecated;
+          description
+            "The number of outbound packets that were chosen to be
+             discarded even though no errors had been detected to
+             prevent their being transmitted.  One possible reason
+             for discarding such a packet could be to free up buffer
+             space.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifOutDiscards";
+        }
+
+        leaf out-errors {
+          type yang:counter32;
+          status deprecated;
+          description
+            "For packet-oriented interfaces, the number of outbound
+             packets that could not be transmitted because of errors.
+             For character-oriented or fixed-length interfaces, the
+             number of outbound transmission units that could not be
+             transmitted because of errors.
+
+             Discontinuities in the value of this counter can occur
+             at re-initialization of the management system and at
+             other times as indicated by the value of
+             'discontinuity-time'.";
+          reference
+            "RFC 2863: The Interfaces Group MIB - ifOutErrors";
+        }
+      }
+    }
+  }
+}
diff --git a/src/share/yang/modules/ietf-yang-types@2013-07-15.yang b/src/share/yang/modules/ietf-yang-types@2013-07-15.yang
new file mode 100644
index 0000000..ee58fa3
--- /dev/null
+++ b/src/share/yang/modules/ietf-yang-types@2013-07-15.yang
@@ -0,0 +1,474 @@
+module ietf-yang-types {
+
+  namespace "urn:ietf:params:xml:ns:yang:ietf-yang-types";
+  prefix "yang";
+
+  organization
+   "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+
+  contact
+   "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+
+  description
+   "This module contains a collection of generally useful derived
+    YANG data types.
+
+    Copyright (c) 2013 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+
+    This version of this YANG module is part of RFC 6991; see
+    the RFC itself for full legal notices.";
+
+  revision 2013-07-15 {
+    description
+     "This revision adds the following new data types:
+      - yang-identifier
+      - hex-string
+      - uuid
+      - dotted-quad";
+    reference
+     "RFC 6991: Common YANG Data Types";
+  }
+
+  revision 2010-09-24 {
+    description
+     "Initial revision.";
+    reference
+     "RFC 6021: Common YANG Data Types";
+  }
+
+  /*** collection of counter and gauge types ***/
+
+  typedef counter32 {
+    type uint32;
+    description
+     "The counter32 type represents a non-negative integer
+      that monotonically increases until it reaches a
+      maximum value of 2^32-1 (4294967295 decimal), when it
+      wraps around and starts increasing again from zero.
+
+      Counters have no defined 'initial' value, and thus, a
+      single value of a counter has (in general) no information
+      content.  Discontinuities in the monotonically increasing
+      value normally occur at re-initialization of the
+      management system, and at other times as specified in the
+      description of a schema node using this type.  If such
+      other times can occur, for example, the creation of
+      a schema node of type counter32 at times other than
+      re-initialization, then a corresponding schema node
+      should be defined, with an appropriate type, to indicate
+      the last discontinuity.
+
+      The counter32 type should not be used for configuration
+      schema nodes.  A default statement SHOULD NOT be used in
+      combination with the type counter32.
+
+      In the value set and its semantics, this type is equivalent
+      to the Counter32 type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+
+  typedef zero-based-counter32 {
+    type yang:counter32;
+    default "0";
+    description
+     "The zero-based-counter32 type represents a counter32
+      that has the defined 'initial' value zero.
+
+      A schema node of this type will be set to zero (0) on creation
+      and will thereafter increase monotonically until it reaches
+      a maximum value of 2^32-1 (4294967295 decimal), when it
+      wraps around and starts increasing again from zero.
+
+      Provided that an application discovers a new schema node
+      of this type within the minimum time to wrap, it can use the
+      'initial' value as a delta.  It is important for a management
+      station to be aware of this minimum time and the actual time
+      between polls, and to discard data if the actual time is too
+      long or there is no defined minimum time.
+
+      In the value set and its semantics, this type is equivalent
+      to the ZeroBasedCounter32 textual convention of the SMIv2.";
+    reference
+      "RFC 4502: Remote Network Monitoring Management Information
+                 Base Version 2";
+  }
+
+  typedef counter64 {
+    type uint64;
+    description
+     "The counter64 type represents a non-negative integer
+      that monotonically increases until it reaches a
+      maximum value of 2^64-1 (18446744073709551615 decimal),
+      when it wraps around and starts increasing again from zero.
+
+      Counters have no defined 'initial' value, and thus, a
+      single value of a counter has (in general) no information
+      content.  Discontinuities in the monotonically increasing
+      value normally occur at re-initialization of the
+      management system, and at other times as specified in the
+      description of a schema node using this type.  If such
+      other times can occur, for example, the creation of
+      a schema node of type counter64 at times other than
+      re-initialization, then a corresponding schema node
+      should be defined, with an appropriate type, to indicate
+      the last discontinuity.
+
+      The counter64 type should not be used for configuration
+      schema nodes.  A default statement SHOULD NOT be used in
+      combination with the type counter64.
+
+      In the value set and its semantics, this type is equivalent
+      to the Counter64 type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+
+  typedef zero-based-counter64 {
+    type yang:counter64;
+    default "0";
+    description
+     "The zero-based-counter64 type represents a counter64 that
+      has the defined 'initial' value zero.
+
+      A schema node of this type will be set to zero (0) on creation
+      and will thereafter increase monotonically until it reaches
+      a maximum value of 2^64-1 (18446744073709551615 decimal),
+      when it wraps around and starts increasing again from zero.
+
+      Provided that an application discovers a new schema node
+      of this type within the minimum time to wrap, it can use the
+      'initial' value as a delta.  It is important for a management
+      station to be aware of this minimum time and the actual time
+      between polls, and to discard data if the actual time is too
+      long or there is no defined minimum time.
+
+      In the value set and its semantics, this type is equivalent
+      to the ZeroBasedCounter64 textual convention of the SMIv2.";
+    reference
+     "RFC 2856: Textual Conventions for Additional High Capacity
+                Data Types";
+  }
+
+  typedef gauge32 {
+    type uint32;
+    description
+     "The gauge32 type represents a non-negative integer, which
+      may increase or decrease, but shall never exceed a maximum
+      value, nor fall below a minimum value.  The maximum value
+      cannot be greater than 2^32-1 (4294967295 decimal), and
+      the minimum value cannot be smaller than 0.  The value of
+      a gauge32 has its maximum value whenever the information
+      being modeled is greater than or equal to its maximum
+      value, and has its minimum value whenever the information
+      being modeled is smaller than or equal to its minimum value.
+      If the information being modeled subsequently decreases
+      below (increases above) the maximum (minimum) value, the
+      gauge32 also decreases (increases).
+
+      In the value set and its semantics, this type is equivalent
+      to the Gauge32 type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+
+  typedef gauge64 {
+    type uint64;
+    description
+     "The gauge64 type represents a non-negative integer, which
+      may increase or decrease, but shall never exceed a maximum
+      value, nor fall below a minimum value.  The maximum value
+      cannot be greater than 2^64-1 (18446744073709551615), and
+      the minimum value cannot be smaller than 0.  The value of
+      a gauge64 has its maximum value whenever the information
+      being modeled is greater than or equal to its maximum
+      value, and has its minimum value whenever the information
+      being modeled is smaller than or equal to its minimum value.
+      If the information being modeled subsequently decreases
+      below (increases above) the maximum (minimum) value, the
+      gauge64 also decreases (increases).
+
+      In the value set and its semantics, this type is equivalent
+      to the CounterBasedGauge64 SMIv2 textual convention defined
+      in RFC 2856";
+    reference
+     "RFC 2856: Textual Conventions for Additional High Capacity
+                Data Types";
+  }
+
+  /*** collection of identifier-related types ***/
+
+  typedef object-identifier {
+    type string {
+      pattern '(([0-1](\.[1-3]?[0-9]))|(2\.(0|([1-9]\d*))))'
+            + '(\.(0|([1-9]\d*)))*';
+    }
+    description
+     "The object-identifier type represents administratively
+      assigned names in a registration-hierarchical-name tree.
+
+      Values of this type are denoted as a sequence of numerical
+      non-negative sub-identifier values.  Each sub-identifier
+      value MUST NOT exceed 2^32-1 (4294967295).  Sub-identifiers
+      are separated by single dots and without any intermediate
+      whitespace.
+
+      The ASN.1 standard restricts the value space of the first
+      sub-identifier to 0, 1, or 2.  Furthermore, the value space
+      of the second sub-identifier is restricted to the range
+      0 to 39 if the first sub-identifier is 0 or 1.  Finally,
+      the ASN.1 standard requires that an object identifier
+      has always at least two sub-identifiers.  The pattern
+      captures these restrictions.
+
+      Although the number of sub-identifiers is not limited,
+      module designers should realize that there may be
+      implementations that stick with the SMIv2 limit of 128
+      sub-identifiers.
+
+      This type is a superset of the SMIv2 OBJECT IDENTIFIER type
+      since it is not restricted to 128 sub-identifiers.  Hence,
+      this type SHOULD NOT be used to represent the SMIv2 OBJECT
+      IDENTIFIER type; the object-identifier-128 type SHOULD be
+      used instead.";
+    reference
+     "ISO9834-1: Information technology -- Open Systems
+      Interconnection -- Procedures for the operation of OSI
+      Registration Authorities: General procedures and top
+      arcs of the ASN.1 Object Identifier tree";
+  }
+
+  typedef object-identifier-128 {
+    type object-identifier {
+      pattern '\d*(\.\d*){1,127}';
+    }
+    description
+     "This type represents object-identifiers restricted to 128
+      sub-identifiers.
+
+      In the value set and its semantics, this type is equivalent
+      to the OBJECT IDENTIFIER type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+
+  typedef yang-identifier {
+    type string {
+      length "1..max";
+      pattern '[a-zA-Z_][a-zA-Z0-9\-_.]*';
+      pattern '.|..|[^xX].*|.[^mM].*|..[^lL].*';
+    }
+    description
+      "A YANG identifier string as defined by the 'identifier'
+       rule in Section 12 of RFC 6020.  An identifier must
+       start with an alphabetic character or an underscore
+       followed by an arbitrary sequence of alphabetic or
+       numeric characters, underscores, hyphens, or dots.
+
+       A YANG identifier MUST NOT start with any possible
+       combination of the lowercase or uppercase character
+       sequence 'xml'.";
+    reference
+      "RFC 6020: YANG - A Data Modeling Language for the Network
+                 Configuration Protocol (NETCONF)";
+  }
+
+  /*** collection of types related to date and time***/
+
+  typedef date-and-time {
+    type string {
+      pattern '\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?'
+            + '(Z|[\+\-]\d{2}:\d{2})';
+    }
+    description
+     "The date-and-time type is a profile of the ISO 8601
+      standard for representation of dates and times using the
+      Gregorian calendar.  The profile is defined by the
+      date-time production in Section 5.6 of RFC 3339.
+
+      The date-and-time type is compatible with the dateTime XML
+      schema type with the following notable exceptions:
+
+      (a) The date-and-time type does not allow negative years.
+
+      (b) The date-and-time time-offset -00:00 indicates an unknown
+          time zone (see RFC 3339) while -00:00 and +00:00 and Z
+          all represent the same time zone in dateTime.
+
+      (c) The canonical format (see below) of data-and-time values
+          differs from the canonical format used by the dateTime XML
+          schema type, which requires all times to be in UTC using
+          the time-offset 'Z'.
+
+      This type is not equivalent to the DateAndTime textual
+      convention of the SMIv2 since RFC 3339 uses a different
+      separator between full-date and full-time and provides
+      higher resolution of time-secfrac.
+
+      The canonical format for date-and-time values with a known time
+      zone uses a numeric time zone offset that is calculated using
+      the device's configured known offset to UTC time.  A change of
+      the device's offset to UTC time will cause date-and-time values
+      to change accordingly.  Such changes might happen periodically
+      in case a server follows automatically daylight saving time
+      (DST) time zone offset changes.  The canonical format for
+      date-and-time values with an unknown time zone (usually
+      referring to the notion of local time) uses the time-offset
+      -00:00.";
+    reference
+     "RFC 3339: Date and Time on the Internet: Timestamps
+      RFC 2579: Textual Conventions for SMIv2
+      XSD-TYPES: XML Schema Part 2: Datatypes Second Edition";
+  }
+
+  typedef timeticks {
+    type uint32;
+    description
+     "The timeticks type represents a non-negative integer that
+      represents the time, modulo 2^32 (4294967296 decimal), in
+      hundredths of a second between two epochs.  When a schema
+      node is defined that uses this type, the description of
+      the schema node identifies both of the reference epochs.
+
+      In the value set and its semantics, this type is equivalent
+      to the TimeTicks type of the SMIv2.";
+    reference
+     "RFC 2578: Structure of Management Information Version 2
+                (SMIv2)";
+  }
+
+  typedef timestamp {
+    type yang:timeticks;
+    description
+     "The timestamp type represents the value of an associated
+      timeticks schema node at which a specific occurrence
+      happened.  The specific occurrence must be defined in the
+      description of any schema node defined using this type.  When
+      the specific occurrence occurred prior to the last time the
+      associated timeticks attribute was zero, then the timestamp
+      value is zero.  Note that this requires all timestamp values
+      to be reset to zero when the value of the associated timeticks
+      attribute reaches 497+ days and wraps around to zero.
+
+      The associated timeticks schema node must be specified
+      in the description of any schema node using this type.
+
+      In the value set and its semantics, this type is equivalent
+      to the TimeStamp textual convention of the SMIv2.";
+    reference
+     "RFC 2579: Textual Conventions for SMIv2";
+  }
+
+  /*** collection of generic address types ***/
+
+  typedef phys-address {
+    type string {
+      pattern '([0-9a-fA-F]{2}(:[0-9a-fA-F]{2})*)?';
+    }
+
+    description
+     "Represents media- or physical-level addresses represented
+      as a sequence octets, each octet represented by two hexadecimal
+      numbers.  Octets are separated by colons.  The canonical
+      representation uses lowercase characters.
+
+      In the value set and its semantics, this type is equivalent
+      to the PhysAddress textual convention of the SMIv2.";
+    reference
+     "RFC 2579: Textual Conventions for SMIv2";
+  }
+
+  typedef mac-address {
+    type string {
+      pattern '[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}';
+    }
+    description
+     "The mac-address type represents an IEEE 802 MAC address.
+      The canonical representation uses lowercase characters.
+
+      In the value set and its semantics, this type is equivalent
+      to the MacAddress textual convention of the SMIv2.";
+    reference
+     "IEEE 802: IEEE Standard for Local and Metropolitan Area
+                Networks: Overview and Architecture
+      RFC 2579: Textual Conventions for SMIv2";
+  }
+
+  /*** collection of XML-specific types ***/
+
+  typedef xpath1.0 {
+    type string;
+    description
+     "This type represents an XPATH 1.0 expression.
+
+      When a schema node is defined that uses this type, the
+      description of the schema node MUST specify the XPath
+      context in which the XPath expression is evaluated.";
+    reference
+     "XPATH: XML Path Language (XPath) Version 1.0";
+  }
+
+  /*** collection of string types ***/
+
+  typedef hex-string {
+    type string {
+      pattern '([0-9a-fA-F]{2}(:[0-9a-fA-F]{2})*)?';
+    }
+    description
+     "A hexadecimal string with octets represented as hex digits
+      separated by colons.  The canonical representation uses
+      lowercase characters.";
+  }
+
+  typedef uuid {
+    type string {
+      pattern '[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-'
+            + '[0-9a-fA-F]{4}-[0-9a-fA-F]{12}';
+    }
+    description
+     "A Universally Unique IDentifier in the string representation
+      defined in RFC 4122.  The canonical representation uses
+      lowercase characters.
+
+      The following is an example of a UUID in string representation:
+      f81d4fae-7dec-11d0-a765-00a0c91e6bf6
+      ";
+    reference
+     "RFC 4122: A Universally Unique IDentifier (UUID) URN
+                Namespace";
+  }
+
+  typedef dotted-quad {
+    type string {
+      pattern
+        '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}'
+      + '([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])';
+    }
+    description
+      "An unsigned 32-bit number expressed in the dotted-quad
+       notation, i.e., four octets written as decimal numbers
+       and separated with the '.' (full stop) character.";
+  }
+}
diff --git a/src/share/yang/modules/kea-ctrl-agent@2019-08-12.yang b/src/share/yang/modules/kea-ctrl-agent@2019-08-12.yang
new file mode 100644
index 0000000..ff25896
--- /dev/null
+++ b/src/share/yang/modules/kea-ctrl-agent@2019-08-12.yang
@@ -0,0 +1,78 @@
+module kea-ctrl-agent {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:kea-ctrl-agent";
+  prefix "kea-ctrl-agent";
+
+  import ietf-inet-types {
+    prefix inet;
+  }
+  import kea-types {
+    prefix kea;
+    revision-date 2019-08-12;
+  }
+
+  organization "Internet Systems Consortium";
+  contact "kea-dev@lists.isc.org";
+  description "This model defines a YANG data model that can be
+               used to configure and manage a Kea control agent.";
+
+  revision 2019-08-12 {
+    description "Initial revision";
+    reference "";
+  }
+
+  /*
+  * Data Nodes
+  */
+
+  container config {
+    // config true;
+    description "Contains control agent configuration.";
+
+    leaf http-host {
+      type inet:ip-address;
+      description "IP address to which HTTP service will be bound.";
+    }
+
+    leaf http-port {
+      type uint16;
+      description "Port to which HTTP service will be bound.";
+    }
+
+    container control-sockets {
+      description "Control sockets.";
+      list socket {
+        key server-type;
+        description "List of server control socket.";
+        leaf server-type {
+          type enumeration {
+            enum "dhcp4" {
+              description "kea-dhcp4 server";
+            }
+            enum "dhcp6" {
+              description "kea-dhcp6 server";
+            }
+            enum "d2" {
+              description "kea-dhcp-ddns server";
+            }
+          }
+          mandatory true;
+          description "Server type.";
+        }
+        container control-socket {
+          description "Control socket information.";
+          uses kea:control-socket-info;
+        }
+      }
+    }
+
+    uses kea:hooks-libraries;
+
+    leaf user-context {
+      type kea:user-context;
+      description "Control agent user context.";
+    }
+
+    uses kea:loggers;
+  }
+}
diff --git a/src/share/yang/modules/kea-dhcp-ddns@2022-07-27.yang b/src/share/yang/modules/kea-dhcp-ddns@2022-07-27.yang
new file mode 100644
index 0000000..bafa6a3
--- /dev/null
+++ b/src/share/yang/modules/kea-dhcp-ddns@2022-07-27.yang
@@ -0,0 +1,184 @@
+module kea-dhcp-ddns {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:kea-dhcp-ddns";
+  prefix "kea-dhcp-ddns";
+
+  import ietf-inet-types {
+    prefix inet;
+  }
+  import kea-types {
+    prefix kea;
+    revision-date 2019-08-12;
+  }
+
+  organization "Internet Systems Consortium";
+  contact "kea-dev@lists.isc.org";
+  description "This model defines a YANG data model that can be
+    used to configure and manage a Kea DHCP-DDNS server.";
+
+  revision 2022-07-27 {
+    description "Added GSS-TSIG key-name configration parameter for DNS
+                 servers";
+  }
+
+  revision 2019-08-12 {
+    description "Initial revision";
+    reference "";
+  }
+
+  /*
+  * Groupings
+  */
+
+  grouping managed-domains {
+    description "Contains parameters for forward or reverse DDNS managed
+      domains.";
+
+    container ddns-domains {
+      description "DDNS domains.";
+      list ddns-domain {
+        key name;
+        description "List of DDNS domains.";
+        leaf name {
+          type string;
+          mandatory true;
+          description "DDNS domain name.";
+        }
+        leaf key-name {
+          type string;
+          description "TSIG key to use. Blank means no TSIG.";
+        }
+        container dns-servers {
+          description "DNS servers.";
+          list server {
+            key ip-address;
+            description "List of DNS servers.";
+            leaf hostname {
+              type string;
+              description "DNS server hostname.";
+            }
+            leaf ip-address {
+              type inet:ip-address;
+              mandatory true;
+              description "DNS server IP address.";
+            }
+            leaf port {
+              type uint16;
+              description "DNS server port.";
+            }
+            leaf key-name {
+              type string;
+              description "Name of the TSIG key used to protect DNS updates for
+                           this server.";
+            }
+            leaf user-context {
+              type kea:user-context;
+              description "DNS server user context.";
+            }
+          }
+        }
+        leaf user-context {
+          type kea:user-context;
+          description "DDNS domain user context.";
+        }
+      }
+    }
+  }
+
+  /*
+  * Data Nodes
+  */
+
+  container config {
+    // config true;
+    description "Contains DHCP-DDNS server configuration.";
+
+    leaf ip-address {
+      type inet:ip-address;
+      description "IP address on which the server listens for requests.";
+    }
+
+    leaf port {
+      type uint16;
+      description "Port on which the server listens for requests.";
+    }
+
+    leaf dns-server-timeout {
+      type uint32;
+      units "milliseconds";
+      description "Maximum amount of time that the server will wait for
+        a response from a DNS server to a single DNS update message.";
+    }
+
+    leaf ncr-protocol {
+      type enumeration {
+        enum "UDP" {
+          description "UDP transport";
+        }
+        enum "TCP" {
+          description "TCP transport";
+        }
+      }
+      description "Protocol to use when sending requests to the server.";
+    }
+
+    leaf ncr-format {
+      type enumeration {
+        enum "JSON" {
+          description "JSON format";
+        }
+      }
+      description "Packet format to use when sending requests to the server.";
+    }
+
+    uses kea:control-socket;
+
+    container forward-ddns {
+      description "Forward DNS zones.";
+      uses managed-domains;
+    }
+
+    container reverse-ddns {
+      description "Reverse DNS zones.";
+      uses managed-domains;
+    }
+
+    container tsig-keys {
+      description "Keys to use with TSIG.";
+      list key {
+        key name;
+        description "List of TSIG keys.";
+        leaf name {
+          type string;
+          mandatory true;
+          description "Key name.";
+        }
+        leaf algorithm {
+          type string;
+          mandatory true;
+          description "Hashing algorithm to use with the key.";
+        }
+        leaf digest-bits {
+           type uint16;
+           units "bits";
+           description "Minimum truncated length. 0 means no truncation.";
+        }
+        leaf secret {
+          type string;
+          mandatory true;
+          description "Shared secret for the key.";
+        }
+        leaf user-context {
+          type kea:user-context;
+          description "Key user context.";
+        }
+      }
+    }
+    leaf user-context {
+      type kea:user-context;
+      description "DHCP-DDNS server user context.";
+    }
+
+    uses kea:loggers;
+  }
+}
diff --git a/src/share/yang/modules/kea-dhcp-types@2023-06-28.yang b/src/share/yang/modules/kea-dhcp-types@2023-06-28.yang
new file mode 100644
index 0000000..fb77060
--- /dev/null
+++ b/src/share/yang/modules/kea-dhcp-types@2023-06-28.yang
@@ -0,0 +1,1256 @@
+module kea-dhcp-types {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:kea-dhcp-types";
+  prefix "kea-dhcp-types";
+
+  import ietf-inet-types {
+    prefix inet;
+  }
+  import kea-types {
+    prefix kea;
+    revision-date 2019-08-12;
+  }
+
+  organization "Internet Systems Consortium";
+  contact "kea-dev@lists.isc.org";
+  description "This file defines some commonly used Kea DHCP types and
+               groupings.";
+
+  revision 2023-06-28 {
+    description "Added pool ID.";
+  }
+
+  revision 2023-05-31 {
+    description "Added allocator, ddns-ttl-percent, exclude-first-last-24,
+                 ignore-dhcp-server-identifier, offer-lifetime, pd-allocator,
+                 read-timeout, tcp-user-timeout, write-timeout.
+                 Removed contact-points, keyspace.";
+  }
+
+  revision 2022-12-27 {
+    description "Added never-send.";
+  }
+
+  revision 2022-11-30 {
+    description "Added the extended-info-checks and the ignore-rai-link-selection nodes.";
+  }
+
+  revision 2022-07-27 {
+    description "Added TLS parameters for database connections: trust-anchor,
+                 cert-file, key-file, cipher-list. Added parameters which govern
+                 the way the server behaves regarding detection of configured
+                 interfaces: service-sockets-require-all,
+                 service-sockets-max-retries, service-sockets-retry-wait-time.
+                 Added parameters which govern reservations lookup:
+                 early-global-reservations-lookup, reservations-lookup-first.";
+  }
+
+  revision 2021-11-24 {
+    description "Fixed store-extended-info. Added several containers and leaves:
+                 compatibility, lenient-option-parsing, multi-threading,
+                 enable-multi-threading, packet-queue-size, thread-pool-size,
+                 valid-lifetime, min-valid-lifetime, max-valid-lifetime,
+                 preferred-lifetime, min-preferred-lifetime,
+                 max-preferred-lifetime, cache-max-age, cache-threshold,
+                 ddns-generated-prefix, ddns-override-client-update,
+                 ddns-override-no-update, ddns-qualifying-suffix,
+                 ddns-replace-client-name, ddns-send-updates,
+                 ddns-update-on-renew, ddns-use-conflict-resolution,
+                 ip-reservations-unique, parked-packet-limit,
+                 reservations-global, reservations-in-subnet,
+                 reservations-out-of-pool, statistic-default-sample-age,
+                 statistic-default-sample-count, store-extended-info, on-fail.";
+  }
+
+  revision 2021-08-25 {
+    description "Added store-extended-info";
+  }
+
+  revision 2019-08-12 {
+    description "Initial revision";
+  }
+
+  /*
+  * Typedef
+  */
+  typedef host-reservation-mode {
+    type enumeration {
+      enum "disabled" {
+        description "Host reservation support is disabled.";
+      }
+      enum "out-of-pool" {
+        description "Allows only out of pool host reservations.";
+      }
+      enum "all" {
+        description "Allows both in pool and out of pool host reservations.";
+      }
+      enum "global" {
+        description "Allows only global host reservations.";
+      }
+    }
+    description "Host reservation mode.";
+  }
+
+  typedef lease-state {
+    type enumeration {
+      enum "default" {
+        description "Active/default";
+      }
+      enum "declined" {
+        description "Declined";
+      }
+      enum "expired-reclaimed" {
+        description "Expired-reclaimed";
+      }
+    }
+    description "Defines state of the lease.";
+  }
+
+  /*
+  * Grouping
+  */
+  grouping valid-lifetime {
+    description "Valid lifetime grouping.";
+    leaf valid-lifetime {
+      type uint32;
+      units "seconds";
+      description "Valid lifetime entry.";
+    }
+  }
+
+  grouping min-valid-lifetime {
+    description "Minimum valid lifetime grouping.";
+    leaf min-valid-lifetime {
+      type uint32;
+      units "seconds";
+      description "Minimum valid lifetime entry.";
+    }
+  }
+
+  grouping max-valid-lifetime {
+    description "Maximum valid lifetime grouping.";
+    leaf max-valid-lifetime {
+      type uint32;
+      units "seconds";
+      description "Maximum valid lifetime entry.";
+    }
+  }
+
+  grouping renew-timer {
+    description "Renew timer grouping.";
+    leaf renew-timer {
+      type uint32;
+      units "seconds";
+      description "Renew timer entry.";
+    }
+  }
+
+  grouping rebind-timer {
+    description "Rebind timer grouping.";
+    leaf rebind-timer {
+      type uint32;
+      units "seconds";
+      description "Rebind timer entry.";
+    }
+  }
+
+  grouping calculate-tee-times {
+    description "Calculate T1/T2 grouping.";
+    leaf calculate-tee-times {
+      type boolean;
+      description "Calculate T1/T2 entry.";
+    }
+  }
+
+  grouping cache-max-age {
+    leaf cache-max-age {
+      type uint32;
+      description
+        "maximum lease age until cached";
+    }
+  }
+
+  grouping cache-threshold {
+    leaf cache-threshold {
+      type decimal64 {
+        fraction-digits 18;
+        range "0 .. 1";
+      }
+      description
+        "cache threshold";
+    }
+  }
+
+  grouping t1-percent {
+    description "T1 timer grouping.";
+    leaf t1-percent {
+      type decimal64 {
+        fraction-digits 18;
+        range "0 .. 1";
+      }
+      description "T1 timer entry.";
+    }
+  }
+
+  grouping t2-percent {
+    description "T2 timer grouping.";
+    leaf t2-percent {
+      type decimal64 {
+        fraction-digits 18;
+        range "0 .. 1";
+      }
+      description "T2 timer entry.";
+    }
+  }
+
+  grouping database {
+    description "Database grouping.";
+    leaf database-type {
+      type string;
+      mandatory true;
+      description "Database type (e.g. mysql).";
+    }
+    leaf user {
+      type string;
+      description "Database user name.";
+    }
+    leaf password {
+      type string;
+      description "Database user password.";
+    }
+    leaf host {
+      type string;
+      description "Database host.";
+    }
+    leaf name {
+      type string;
+      description "Database name.";
+    }
+    leaf persist {
+      type boolean;
+      description "Write lease to disk file. This parameter applies only to
+                   memfile backend.";
+    }
+    leaf port {
+      type uint16;
+      description "Database port.";
+    }
+    leaf lfc-interval {
+      type uint32;
+      units "seconds";
+      description "Interval between two lease file cleanups.";
+    }
+    leaf readonly {
+      type boolean;
+      description "If set to true, the database will be connected in
+                   read-only mode. This does not make sense for lease
+                   databases, only for host reservations and possibly
+                   for upcoming config backend.";
+    }
+    leaf trust-anchor {
+      type string;
+      description "TLS trust anchor.";
+    }
+    leaf cert-file {
+      type string;
+      description "TLS certificate file.";
+    }
+    leaf key-file {
+      type string;
+      description "TLS key file.";
+    }
+    leaf cipher-list {
+      type string;
+      description "TLS cipher list.";
+    }
+    leaf connect-timeout {
+      type uint32;
+      units "milliseconds";
+      description "Database connection timeout.";
+    }
+    leaf read-timeout {
+      type uint32;
+      units "seconds";
+      description "timeout for database read operations";
+    }
+    leaf write-timeout {
+      type uint32;
+      units "seconds";
+      description "timeout for database write operations";
+    }
+    leaf max-reconnect-tries {
+      type uint32;
+      description "Maximum of recovery attempts before exit.";
+    }
+    leaf reconnect-wait-time {
+      type uint32;
+      units "milliseconds";
+      description "Waiting delay between two recovery attempts.";
+    }
+    leaf request-timeout {
+      type uint32;
+      units "milliseconds";
+      description "Timeout waiting for a response.";
+    }
+    leaf tcp-keepalive {
+      type uint32;
+      units "seconds";
+      description "TCP keepalive for the database connection.";
+    }
+    leaf tcp-nodelay {
+      type boolean;
+      description "TCP nodelay for the database connection.";
+    }
+    leaf tcp-user-timeout {
+      type uint32;
+      units "seconds";
+      description "TCP user timeout while communicating with the database";
+    }
+    leaf consistency {
+      type string;
+      description "Consistency level.";
+    }
+    leaf serial-consistency {
+      type string;
+      description "Serial consistency level.";
+    }
+    leaf max-row-errors {
+      type uint32;
+      description "Maximum row errors (0 means unlimited).";
+    }
+    leaf on-fail {
+      type string;
+      description
+        "action to take when connection recovery fails";
+    }
+    uses kea:user-context {
+      refine user-context {
+        description "Database user context. Arbitrary JSON data can be
+                     stored here.";
+      }
+    }
+  }
+
+  grouping databases {
+    description "Databases grouping.";
+    container lease-database {
+      presence "Have lease database.";
+      description "Lease database.";
+      uses database;
+    }
+    list hosts-database {
+      key database-type;
+      description "List of databases.";
+      uses database;
+    }
+  }
+
+  grouping expired-leases-processing {
+    description "Expired leases processing grouping.";
+    container expired-leases-processing {
+      description "Expired leases processing setup.";
+      leaf reclaim-timer-wait-time {
+        type uint32;
+        units "seconds";
+        description "Interval between reclamation cycles.";
+      }
+      leaf flush-reclaimed-timer-wait-time {
+        type uint32;
+        units "seconds";
+        description "Interval between reclaimed leases collection.";
+      }
+      leaf hold-reclaimed-time {
+        type uint32;
+        units "seconds";
+        description "Hold timer for re-assignment.";
+      }
+      leaf max-reclaim-leases {
+        type uint32;
+        description "Maximum number of reclaimed leases per cycle.";
+      }
+      leaf max-reclaim-time {
+        type uint32;
+        units "milliseconds";
+        description "Maximum duration of a reclamation cycle.";
+      }
+      leaf unwarned-reclaim-cycles {
+        type uint32;
+        description "Maximum numbers of uncomplete cycles before warning.";
+      }
+    }
+  }
+
+  grouping hostname-char-set {
+    description "Hostname character set grouping.";
+    leaf hostname-char-set {
+      type string;
+      description "A regex defining invalid characters. If detected, those
+                   will be replaced by hostname-char-replacement.";
+    }
+  }
+
+  grouping hostname-char-replacement {
+    description "Hostname character replacement grouping.";
+    leaf hostname-char-replacement {
+      type string;
+      description "Replacement for invalid charaters. See
+                   hostname-char-set.";
+    }
+  }
+
+  grouping dhcp-ddns {
+    description "DHCP-DDNS grouping.";
+    container dhcp-ddns {
+      description "DHCP-DDNS client setup.";
+      leaf enable-updates {
+        type boolean;
+        description "Enable DHCP-DDNS updates.";
+      }
+      leaf qualifying-suffix {
+        type string;
+        description "DHCP-DDNS qualifying suffix.";
+      }
+      leaf server-ip {
+        type inet:ip-address;
+        description "DHCP-DDNS server IP address.";
+      }
+      leaf server-port {
+        type uint16;
+        description "DHCP-DDNS server port.";
+      }
+      leaf sender-ip {
+        type inet:ip-address;
+        description "DHCP-DDNS sender IP address.";
+      }
+      leaf sender-port {
+        type uint16;
+        description "DHCP-DDNS sender port.";
+      }
+      leaf max-queue-size {
+        type uint32;
+        description "Maximum DHCP-DDNS queue size.";
+      }
+      leaf ncr-protocol {
+        type enumeration {
+          enum "UDP" {
+            description "UDP transport";
+          }
+          enum "TCP" {
+            description "TCP transport";
+          }
+        }
+        description "Protocol to use for DHCP-DDNS communication.
+                     Currently only UDP is supported.";
+      }
+      leaf ncr-format {
+        type enumeration {
+          enum "JSON" {
+            description "JSON format";
+          }
+        }
+        description "Packet format to use for DHCP-DDNS.";
+      }
+      leaf override-no-update {
+        type boolean;
+        description "Ignore client request and send update.";
+      }
+      leaf override-client-update {
+        type boolean;
+        description "Ignore client delegation.";
+      }
+      leaf replace-client-name {
+        type enumeration {
+          enum "when-present" {
+            description "When the client sent a name.";
+          }
+          enum "never" {
+            description "Never replace or generate a name.";
+          }
+          enum "always" {
+            description "Always replace or generate a name.";
+          }
+          enum "when-not-present" {
+            description "When the client did not send a name.";
+          }
+        }
+        description "Replace the name provided by the client.";
+      }
+      leaf generated-prefix {
+        type string;
+        description "DHCP-DDNS generated prefix.";
+      }
+      uses hostname-char-set;
+      uses hostname-char-replacement;
+      uses kea:user-context {
+        refine user-context {
+          description "DHCP-DDNS user context. Arbitrary JSON data can
+                       be stored here.";
+        }
+      }
+    }
+  }
+  grouping sanity-checks {
+    description
+      "Sanity checks grouping.";
+    container sanity-checks {
+      description
+        "Sanity checks container.";
+      leaf extended-info-checks {
+        type enumeration {
+          enum "none" {
+            description
+              "Don't attempt to correct or upgrade the extended info.";
+          }
+          enum "fix" {
+            description
+              "Fix common inconsistencies and upgrade from old format. This is the default.";
+          }
+          enum "pedantic" {
+            description
+              "Enforce full Kea code formatting.";
+          }
+          enum "strict" {
+            description
+              "Fix inconsistencies with an impact on lease query.";
+          }
+        }
+        description
+          "Specifies how Kea DHCPv4 server should behave when
+           invalid extended info is read from a lease.";
+      }
+      leaf lease-checks {
+        type enumeration {
+          enum "none" {
+            description
+              "No checks.";
+          }
+          enum "warn" {
+            description
+              "When a check fails print a warning and accept the
+               lease.";
+          }
+          enum "fix" {
+            description
+              "When a check fails try to fix it and accept the
+               lease.";
+          }
+          enum "fix-del" {
+            description
+              "When a check fails try to fix it and reject the
+               lease if still bad.";
+          }
+          enum "del" {
+            description
+              "When a check fails reject the lease.";
+          }
+        }
+        description
+          "Lease checks: verify subnet-id consistency on memfile
+           loading.";
+      }
+    }
+  }
+
+  grouping client-class {
+    description "Client class grouping.";
+    leaf client-class {
+      type string;
+      description "Client class entry.";
+    }
+  }
+
+  grouping pool-client-class {
+    description "Client class grouping for a pool.";
+    uses client-class {
+      refine client-class {
+        description "Pool client class guard (only clients belonging
+                     to this class will be allowed in this pool).";
+      }
+    }
+  }
+
+  grouping subnet-client-class {
+    description "Client class grouping for a subnet.";
+    uses client-class {
+      refine client-class {
+        description "Subnet client class guard (only clients belonging to this
+                     class will be allowed in this subnet).";
+      }
+    }
+  }
+
+  grouping network-client-class {
+    description "Client class grouping for a shared network.";
+    uses client-class {
+      refine client-class {
+        description "Shared network client class guard (only clients
+                     belonging to this class will be allowed in this
+                     shared network).";
+      }
+    }
+  }
+
+  grouping require-client-classes {
+    description "Require client classes grouping.";
+    leaf-list require-client-classes {
+      type string;
+      description "List of client classes.";
+    }
+  }
+
+  grouping pool-require-client-classes {
+    description "Require client classes grouping for a pool.";
+    uses require-client-classes {
+      refine require-client-classes {
+        description "Pool require client classes.";
+      }
+    }
+  }
+
+  grouping subnet-require-client-classes {
+    description "Require client classes grouping for a subnet.";
+    uses require-client-classes {
+      refine require-client-classes {
+        description "Subnet require client classes.";
+      }
+    }
+  }
+
+  grouping network-require-client-classes {
+    description "Require client classes grouping for a shared network.";
+    uses require-client-classes {
+      refine require-client-classes {
+        description "Shared network require client classes.";
+      }
+    }
+  }
+
+  grouping interface {
+    description "Interface grouping.";
+    leaf interface {
+      type string;
+      description "Interface entry.";
+    }
+  }
+
+  grouping subnet-interface {
+    description "Interface grouping for a subnet.";
+    uses interface {
+      refine interface {
+        description "Name of the network interface this subnet is directly
+                     accessible with (optional).";
+      }
+    }
+  }
+
+  grouping network-interface {
+    description "Interface grouping for a shared network.";
+    uses interface {
+      refine interface {
+        description "Specifies the network interface this shared network is
+                     directly accessible with. (optional)";
+      }
+    }
+  }
+
+  grouping subnet-id {
+    description "Subnet ID grouping.";
+    leaf id {
+      type uint32 {
+        range 1..max;
+      }
+      mandatory true;
+      description "Subnet ID, a unique identifier used to locate or reference
+                   a subnet.";
+    }
+  }
+
+  grouping pool-id {
+    description "Pool ID grouping.";
+    leaf pool-id {
+      type uint32 {
+        range 1..max;
+      }
+      description "Pool ID, an identifier used to locate or reference a pool.";
+    }
+  }
+
+  grouping host-identifier {
+    description "Host identifier grouping.";
+    leaf identifier {
+      type string;
+      description "Host identifier.";
+    }
+  }
+
+  grouping host-hostname {
+    description "Host DNS name grouping.";
+    leaf hostname {
+      type string;
+      description "Host DNS name.";
+    }
+  }
+
+  grouping host-client-classes {
+    description "Host client classes grouping.";
+    leaf-list client-classes {
+      type string;
+      description "Host client classes (if host identifier matches, a
+                   client's packet will be added to the classes liste
+                   here.)";
+    }
+  }
+
+  grouping host-subnet-id {
+    description "Host subnet ID grouping.";
+    leaf subnet-id {
+      type uint32;
+      mandatory true;
+      description "Host subnet ID.";
+    }
+  }
+
+  grouping reservation-mode {
+    description "Reservation mode grouping.";
+    leaf reservation-mode {
+      type host-reservation-mode;
+      description "Reservation mode entry.";
+    }
+  }
+
+  grouping interfaces-re-detect {
+    description "Interfaces re-detect grouping.";
+    leaf re-detect {
+      type boolean;
+      description "Re-detect interfaces at each reconfiguration.";
+    }
+  }
+
+  grouping interfaces-service-sockets-require-all {
+    description "Interfaces service-sockets-require-all grouping.";
+    leaf service-sockets-require-all {
+      type boolean;
+      description "Kea tries to bind the service sockets during initialization.
+                   It may fail due to a port being already opened or
+                   misconfiguration. Kea can suppress these errors and only logs
+                   them. This flag prevents starting the DHCP server without
+                   binding all sockets.";
+    }
+  }
+
+  grouping interfaces-service-sockets-max-retries {
+    description "Interfaces service-sockets-max-retries grouping.";
+    leaf service-sockets-max-retries {
+      type uint32;
+      description "Kea tries to bind the service sockets during initialization.
+                   This option specifies how many times binding to interface
+                   will be retried.";
+    }
+  }
+
+  grouping interfaces-service-sockets-retry-wait-time {
+    description "Interfaces service-sockets-retry-wait-time grouping.";
+    leaf service-sockets-retry-wait-time {
+      type uint32;
+      description "The time interval in milliseconds to wait before the next
+                   attempt to retry opening a service socket.";
+    }
+  }
+
+  grouping class-name {
+    description "Client class name grouping.";
+    leaf name {
+      type string;
+      mandatory true;
+      description "Name of the client class.";
+    }
+  }
+
+  grouping class-test {
+    description "Client class test grouping.";
+    leaf test {
+      type string;
+      description "Defines an expression that evaluates every incoming
+                   packet.";
+    }
+  }
+
+  grouping template-test {
+    leaf template-test {
+      type string;
+      description
+        "The test expression for a template class.";
+    }
+  }
+
+  grouping class-only-if-required {
+    description "Client class only-if-required grouping.";
+    leaf only-if-required {
+      type boolean;
+      description "Client class only if required flag.";
+    }
+  }
+
+  grouping option-def-name {
+    description "Option definition name grouping.";
+    leaf name {
+      type string;
+      mandatory true;
+      description "Name of the new option being defined.";
+    }
+  }
+
+  grouping option-def-type {
+    description "Option definition type grouping.";
+    leaf type {
+      type string;
+      mandatory true;
+      description "Type of the new option being defined (such as
+                   string, record or uint8).";
+    }
+  }
+
+  grouping option-def-record-types {
+    description "Option definition record types grouping.";
+    leaf record-types {
+      type string;
+      description "Option definition record types.";
+    }
+  }
+
+  grouping option-def-encapsulate {
+    description "Option definition encapsulate grouping.";
+    leaf encapsulate {
+      type string;
+      description "Defines option space this new option encapsulates.
+                   Usually empty.";
+    }
+  }
+
+  grouping option-data-name {
+    description "Option data name grouping.";
+    leaf name {
+      type string;
+      description "Option name.";
+    }
+  }
+
+  grouping option-data-data {
+    description "Option data data grouping.";
+    leaf data {
+      type string;
+      description "Option data.";
+    }
+  }
+
+  grouping option-data-csv-format {
+    description "Option data csv-format grouping.";
+    leaf csv-format {
+      type boolean;
+      description "If true, the option is specified as comma separated
+                   values.  If false, it is expected as a hex string.";
+    }
+  }
+
+  grouping option-data-always-send {
+    description "Option data always-send grouping.";
+    leaf always-send {
+      type boolean;
+      description "Defines whether to always send the option,
+                   regardless if the client requested it or not.";
+    }
+  }
+
+  grouping option-data-never-send {
+    description "Option data never-send grouping.";
+    leaf never-send {
+      type boolean;
+      description "Defines whether to never send the option.";
+    }
+  }
+
+  grouping option-def-array {
+    description "Option data array grouping.";
+    leaf array {
+      type boolean;
+      description "Option definition array flag.";
+    }
+  }
+
+  grouping decline-probation-period {
+    description "Decline probation period grouping.";
+    leaf decline-probation-period {
+      type uint32;
+      units "seconds";
+      description "Decline probabation period.";
+    }
+  }
+
+  grouping network-name {
+    description "Shared network name grouping.";
+    leaf name {
+      type string;
+      mandatory true;
+      description "Shared network name.";
+    }
+  }
+
+  grouping dhcp4o6-port {
+    description "DHCPv4-over-DHCPv6 port grouping.";
+    leaf dhcp4o6-port {
+      type uint16;
+      description "DHCPv4-over-DHCPv6 interserver port.";
+    }
+  }
+
+  grouping pool-user-context {
+    description "User context grouping for a pool.";
+    uses kea:user-context {
+      refine user-context {
+        description "Pool user context. Arbitrary JSON data can be
+                     stored here.";
+      }
+    }
+  }
+
+  grouping host-user-context {
+    description "User context grouping for a host reservation.";
+    uses kea:user-context {
+      refine user-context {
+        description "Host user context. Arbitrary JSON data can be
+                     stored here.";
+      }
+    }
+  }
+
+  grouping subnet-user-context {
+    description "User context grouping for a subnet.";
+    uses kea:user-context {
+      refine user-context {
+        description "Subnet user context. Arbitrary JSON data can be
+                     stored here.";
+      }
+    }
+  }
+
+  grouping network-user-context {
+    description "User context grouping for a shared network.";
+    uses kea:user-context {
+      refine user-context {
+        description "Shared network user context. Arbitrary JSON data can be
+                     stored here.";
+      }
+    }
+  }
+
+  grouping interfaces-user-context {
+    description "User context grouping for interfaces.";
+    uses kea:user-context {
+      refine user-context {
+        description "Interfaces user context. Arbitrary JSON data can
+                     be stored here.";
+      }
+    }
+  }
+
+  grouping class-user-context {
+    description "User context grouping for a client class.";
+    uses kea:user-context {
+      refine user-context {
+        description "Client class user context. Arbitrary JSON data can
+                     be stored here.";
+      }
+    }
+  }
+
+  grouping option-def-user-context {
+    description "User context grouping for an option definition.";
+    uses kea:user-context {
+      refine user-context {
+        description "Option definition user context. Arbitrary JSON data
+                     can be stored here.";
+      }
+    }
+  }
+
+  grouping option-data-user-context {
+    description "User context grouping for an option data.";
+    uses kea:user-context {
+      refine user-context {
+        description "Option user context. Arbitrary JSON data can be
+                     stored here.";
+      }
+    }
+  }
+
+  grouping config-control {
+    description "Config control grouping.";
+    container config-control {
+      description "Config control.";
+      leaf config-fetch-wait-time {
+        type uint32;
+        units "seconds";
+        description "Configuration fetch wait time entry.";
+      }
+      list config-database {
+        key database-type;
+        description "List of databases.";
+        uses database;
+      }
+    }
+  }
+
+  grouping server-tag {
+    description "Server tag grouping.";
+    leaf server-tag {
+      type string;
+      description "Server tag.";
+    }
+  }
+
+  grouping dhcp-queue-control {
+    description "DHCP queue control grouping.";
+    leaf dhcp-queue-control {
+      type string;
+      description "DHCP queue control (JSON map).";
+    }
+  }
+
+  grouping store-extended-info {
+    leaf store-extended-info {
+      description "whether Kea should store additional client query data e.g. RAI in packets";
+      type boolean;
+    }
+  }
+
+  grouping common-compatibility {
+    description
+      "parameters that are common to DHCPv4 and DHCPv6 for triggering behaviors compatible
+        with broken or non-compliant clients, relays or other agents";
+    leaf ignore-rai-link-selection {
+      type boolean;
+      description
+        "Ignore the link selection RAI suboption.";
+    }
+    leaf lenient-option-parsing {
+      type boolean;
+      description
+        "Enable more lenient option parsing.";
+    }
+  }
+
+  grouping v4-compatibility {
+    description
+      "DHCPv4-specific parameters for triggering behaviors compatible
+        with broken or non-compliant clients, relays or other agents";
+    leaf exclude-first-last-24 {
+      type boolean;
+      description
+        "Whether .0 and .255 addresses should be excluded from allocation in subnets with a prefix length of 24 or less.";
+    }
+    leaf ignore-dhcp-server-identifier {
+      type boolean;
+      description
+        "Whether the DHCP Server Identifier should be ignored in ingress packets.";
+    }
+  }
+
+  grouping ddns-generated-prefix {
+    leaf ddns-generated-prefix {
+      type string;
+      description
+        "the prefix to be prepended to the generated Client FQDN";
+    }
+  }
+
+  grouping ddns-override-client-update {
+    leaf ddns-override-client-update {
+      type boolean;
+      description
+        "whether to ignore DHCP client requests to update DNS";
+    }
+  }
+
+  grouping ddns-override-no-update {
+    leaf ddns-override-no-update {
+      type boolean;
+      description
+        "whether to override DHCP client requests to not update DNS";
+    }
+  }
+
+  grouping ddns-qualifying-suffix {
+    leaf ddns-qualifying-suffix {
+      type string;
+      description
+        "the suffix appended to the partial name sent to the DNS";
+    }
+  }
+
+  grouping ddns-replace-client-name {
+    leaf ddns-replace-client-name {
+      type string;
+      description
+        "whether the server should honor the hostname or Client FQDN
+         sent by the client; multiple options are available";
+    }
+  }
+
+  grouping ddns-send-updates {
+    leaf ddns-send-updates {
+      type boolean;
+      description
+        "whether DDNS updates should be enabled";
+    }
+  }
+
+  grouping ddns-ttl-percent {
+    leaf ddns-ttl-percent {
+      type decimal64 {
+        fraction-digits 18;
+        range "0 .. 1";
+      }
+      description
+        "the percentage of the leases's lifetime to use for the DNS TTL";
+    }
+  }
+
+  grouping ddns-update-on-renew {
+    leaf ddns-update-on-renew {
+      type boolean;
+      description
+        "whether to update DNS when leases are renewed";
+    }
+  }
+
+  grouping ddns-use-conflict-resolution {
+    leaf ddns-use-conflict-resolution {
+      type boolean;
+      description
+        "whether RFC 4703 DNS update conflict resolution should be
+         employed";
+    }
+  }
+
+  grouping ip-reservations-unique {
+    leaf ip-reservations-unique {
+      type boolean;
+      description
+        "whether Kea should enforce a single reservation per address";
+    }
+  }
+
+  grouping early-global-reservations-lookup {
+    leaf early-global-reservations-lookup {
+      type boolean;
+      description
+        "whether an early global host reservations lookup should be performed";
+    }
+  }
+
+  grouping reservations-lookup-first {
+    leaf reservations-lookup-first {
+      type boolean;
+      description
+        "whether host reservations lookup should be performed before lease
+         lookup";
+    }
+  }
+
+  grouping multi-threading {
+    container multi-threading {
+      description
+        "multi-threading parameters";
+      leaf enable-multi-threading {
+        type boolean;
+        description
+          "whether Kea should run on multiple threads or just one";
+      }
+
+      leaf packet-queue-size {
+        type uint32;
+        description
+          "the capacity of the packet backlog that threads dequeue from";
+      }
+
+      leaf thread-pool-size {
+        type uint32;
+        description
+          "the number of threads Kea should use for packet processing";
+      }
+    }
+  }
+
+  grouping parked-packet-limit {
+    leaf parked-packet-limit {
+      type uint32;
+      description
+        "maximum allowed capacity of parked packets";
+    }
+  }
+
+  grouping reservations-global {
+    leaf reservations-global {
+      type boolean;
+      description
+        "whether Kea should lookup global reservations";
+    }
+  }
+
+  grouping reservations-in-subnet {
+    leaf reservations-in-subnet {
+      type boolean;
+      description
+        "whether Kea should lookup in-subnet reservations";
+    }
+  }
+
+  grouping reservations-out-of-pool {
+    leaf reservations-out-of-pool {
+      type boolean;
+      description
+        "whether Kea can assume that all reservations are
+         out-of-pool";
+    }
+  }
+
+  grouping statistic-default-sample-age {
+    leaf statistic-default-sample-age {
+      type uint32;
+      description
+        "the maximum number of seconds that samples are kept for";
+    }
+  }
+
+  grouping statistic-default-sample-count {
+    leaf statistic-default-sample-count {
+      type uint32;
+      description
+        "the maximum number of samples which are kept";
+    }
+  }
+
+  grouping allocator {
+    leaf allocator {
+      type string;
+      description
+        "the allocation strategy for IP addresses";
+    }
+  }
+
+  grouping pd-allocator {
+    leaf pd-allocator {
+      type string;
+      description
+        "the allocation strategy for delegated prefixes";
+    }
+  }
+
+  grouping offer-lifetime {
+    leaf offer-lifetime {
+      type uint32;
+      description
+        "the lifetime of leases temporarily allocated on DISCOVER";
+    }
+  }
+}
diff --git a/src/share/yang/modules/kea-dhcp4-server@2023-06-28.yang b/src/share/yang/modules/kea-dhcp4-server@2023-06-28.yang
new file mode 100644
index 0000000..c256105
--- /dev/null
+++ b/src/share/yang/modules/kea-dhcp4-server@2023-06-28.yang
@@ -0,0 +1,644 @@
+module kea-dhcp4-server {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:kea-dhcp4-server";
+  prefix "kea-dhcp4-server";
+
+  import ietf-inet-types {
+    prefix inet;
+  }
+  import kea-types {
+    prefix kea;
+    revision-date 2019-08-12;
+  }
+  import kea-dhcp-types {
+    prefix dhcp;
+    revision-date 2023-06-28;
+  }
+
+  organization "Internet Systems Consortium";
+  contact "kea-dev@lists.isc.org";
+  description "This model defines a YANG data model that can be
+               used to configure and manage a Kea DHCPv4 server.";
+
+  revision 2023-06-28 {
+    description "Added pool ID.";
+  }
+
+  revision 2023-05-31 {
+    description "Added allocator, ddns-ttl-percent, exclude-first-last-24,
+                 ignore-dhcp-server-identifier, offer-lifetime,
+                 read-timeout, tcp-user-timeout, write-timeout.
+                 Removed contact-points, keyspace.";
+  }
+
+  revision 2022-12-27 {
+    description "Added never-send to option-data.";
+  }
+
+  revision 2022-11-30 {
+    description "Added the template-test node for client classes.";
+  }
+
+  revision 2022-07-27 {
+    description "Added TLS parameters for database connections: trust-anchor,
+                 cert-file, key-file, cipher-list. Added parameters which govern
+                 the way the server behaves regarding detection of configured
+                 interfaces: service-sockets-require-all,
+                 service-sockets-max-retries, service-sockets-retry-wait-time.
+                 Added parameters which govern reservations lookup:
+                 early-global-reservations-lookup, reservations-lookup-first.";
+  }
+
+  revision 2021-11-24 {
+    description "Fixed store-extended-info. Added several containers and leaves:
+                 compatibility, lenient-option-parsing, multi-threading,
+                 enable-multi-threading, packet-queue-size, thread-pool-size,
+                 valid-lifetime, min-valid-lifetime, max-valid-lifetime,
+                 preferred-lifetime, min-preferred-lifetime,
+                 max-preferred-lifetime, cache-max-age, cache-threshold,
+                 ddns-generated-prefix, ddns-override-client-update,
+                 ddns-override-no-update, ddns-qualifying-suffix,
+                 ddns-replace-client-name, ddns-send-updates,
+                 ddns-update-on-renew, ddns-use-conflict-resolution,
+                 ip-reservations-unique, parked-packet-limit,
+                 reservations-global, reservations-in-subnet,
+                 reservations-out-of-pool, statistic-default-sample-age,
+                 statistic-default-sample-count, store-extended-info, on-fail.";
+  }
+
+  revision 2021-08-25 {
+    description "Added store-extended-info";
+  }
+
+  revision 2019-08-12 {
+    description "Initial revision";
+  }
+
+  /*
+  * Typedefs
+  */
+  typedef host-identifier-type {
+    type enumeration {
+      enum "duid" {
+        description "DUID";
+      }
+      enum "hw-address" {
+        description "Hardware address";
+      }
+      enum "circuit-id" {
+        description "Circuit-id option";
+      }
+      enum "client-id" {
+        description "Client identifier";
+      }
+      enum "flex-id" {
+        description "Flexible identifier";
+      }
+    }
+    description "Host identifier type.";
+  }
+
+  /*
+  * Groupings
+  */
+  grouping match-client-id {
+    description "Match client ID grouping.";
+    leaf match-client-id {
+      type boolean;
+      description "Use client-id for lease lookups. If set to false, client-id
+                   will be ignored.";
+    }
+  }
+
+  grouping next-server {
+    description "Next server address grouping.";
+    leaf next-server {
+      type inet:ipv4-address;
+      description "Next server IPv4 address. If set, this value will be set
+                   in siaddr field.";
+    }
+  }
+
+  grouping server-hostname {
+    description "Server hostname grouping.";
+    leaf server-hostname {
+      type string;
+      description "Server hostname (up to 64 bytes).";
+    }
+  }
+
+  grouping boot-file-name {
+    description "Boot file name grouping.";
+    leaf boot-file-name {
+      type string;
+      description "Boot file name (up to 128 bytes).";
+    }
+  }
+
+  grouping authoritative {
+    description "Authoritative grouping.";
+    leaf authoritative {
+      type boolean;
+      description "NAK requests for unknown clients. If set to false
+                   ignore them.";
+      }
+  }
+
+  grouping relay {
+    description "Relay grouping.";
+    leaf-list ip-addresses {
+      type inet:ipv4-address;
+      description "IPv4 addresses.";
+    }
+  }
+
+  grouping host {
+    description "Host grouping.";
+    leaf identifier-type {
+      type host-identifier-type;
+      mandatory true;
+      description "Host identifier type.";
+    }
+    uses dhcp:host-identifier;
+    leaf ip-address {
+      type inet:ipv4-address;
+      description "Host reserved IPv4 address.";
+    }
+    uses dhcp:host-hostname;
+    uses dhcp:host-client-classes;
+    uses option-data-list;
+    uses next-server;
+    uses server-hostname;
+    uses boot-file-name;
+    uses dhcp:host-user-context;
+  }
+
+  grouping reservations {
+    description "Host reservations grouping.";
+    list host {
+      key "identifier-type identifier";
+      description "Host reservation list.";
+      uses host;
+    }
+  }
+
+  grouping subnet4-list {
+    description "Subnet4 list grouping.";
+    list subnet4 {
+      key id;
+      ordered-by user;
+      description "List of IPv4 subnets.";
+      uses dhcp:allocator;
+      uses dhcp:offer-lifetime;
+      uses dhcp:valid-lifetime;
+      uses dhcp:min-valid-lifetime;
+      uses dhcp:max-valid-lifetime;
+      uses dhcp:renew-timer;
+      uses dhcp:rebind-timer;
+      uses dhcp:calculate-tee-times;
+      uses dhcp:t1-percent;
+      uses dhcp:t2-percent;
+      uses option-data-list;
+      list pool {
+        key "start-address end-address";
+        ordered-by user;
+        description "Pool list.";
+        leaf prefix {
+          type inet:ipv4-prefix;
+          description "Defines a pool of dynamic IPv4 addresses to be managed
+                       by the server.";
+        }
+        leaf start-address {
+          type inet:ipv4-address;
+          mandatory true;
+          description "First IPv4 address in a pool.";
+        }
+        leaf end-address {
+          type inet:ipv4-address;
+          mandatory true;
+          description "Last IPv4 address in a pool.";
+        }
+        uses option-data-list;
+        uses dhcp:pool-client-class;
+        uses dhcp:pool-require-client-classes;
+        uses dhcp:pool-id;
+        uses dhcp:pool-user-context;
+      }
+      leaf subnet {
+        type inet:ipv4-prefix;
+        mandatory true;
+        description "IPv4 subnet prefix.";
+      }
+      uses dhcp:subnet-interface;
+      uses dhcp:subnet-id;
+      uses dhcp:subnet-client-class;
+      uses dhcp:subnet-require-client-classes;
+      uses reservations {
+        refine host {
+          description "Subnet host reservations list.";
+        }
+      }
+      uses dhcp:reservation-mode;
+      container relay {
+        description "Optional information about relay agent.";
+        uses relay;
+      }
+      uses match-client-id;
+      uses next-server;
+      uses server-hostname;
+      uses boot-file-name;
+      leaf subnet-4o6-interface {
+        type string;
+        description "Subnet DHCPv4-over-DHCPv6 interface.";
+      }
+      leaf subnet-4o6-interface-id {
+        type string;
+        description "Subnet DHCPv4-over-DHCPv6 interface-id option.";
+      }
+      leaf subnet-4o6-subnet {
+        type inet:ipv6-prefix;
+        description "Subnet DHCPv4-over-DHCPv6 IPv6 prefix.";
+      }
+      uses authoritative;
+      uses dhcp:cache-max-age;
+      uses dhcp:cache-threshold;
+      uses dhcp:ddns-generated-prefix;
+      uses dhcp:ddns-override-client-update;
+      uses dhcp:ddns-override-no-update;
+      uses dhcp:ddns-qualifying-suffix;
+      uses dhcp:ddns-replace-client-name;
+      uses dhcp:ddns-send-updates;
+      uses dhcp:ddns-ttl-percent;
+      uses dhcp:ddns-update-on-renew;
+      uses dhcp:ddns-use-conflict-resolution;
+      uses dhcp:hostname-char-replacement;
+      uses dhcp:hostname-char-set;
+      uses dhcp:reservations-global;
+      uses dhcp:reservations-in-subnet;
+      uses dhcp:reservations-out-of-pool;
+      uses dhcp:store-extended-info;
+      uses dhcp:subnet-user-context;
+    }
+  }
+
+  grouping client-classes {
+    description "Client class grouping.";
+    list client-class {
+      key name;
+      ordered-by user;
+      description "List of client classes.";
+      uses dhcp:class-name;
+      uses dhcp:class-test;
+      uses dhcp:template-test;
+      uses dhcp:class-only-if-required;
+      uses dhcp:offer-lifetime;
+      uses option-def-list;
+      uses option-data-list;
+      uses next-server;
+      uses server-hostname;
+      uses boot-file-name;
+      uses dhcp:valid-lifetime;
+      uses dhcp:min-valid-lifetime;
+      uses dhcp:max-valid-lifetime;
+      uses dhcp:class-user-context;
+    }
+  }
+
+  grouping option-def-list {
+    description "Option definition list grouping.";
+    list option-def {
+      key "code space";
+      description "Option definition entry.";
+      leaf code {
+        type uint8;
+        mandatory true;
+        description "Option code to be used by the new option definition.";
+      }
+      leaf space {
+        type string;
+        mandatory true;
+        description "Option space for the new option (typically dhcp4).";
+      }
+      uses dhcp:option-def-name;
+      uses dhcp:option-def-type;
+      uses dhcp:option-def-record-types;
+      uses dhcp:option-def-encapsulate;
+      uses dhcp:option-def-array;
+      uses dhcp:option-def-user-context;
+     }
+  }
+
+  grouping option-data-list {
+    description "Option data list grouping.";
+    list option-data {
+      key "code space";
+      description "Option data entry.";
+      leaf code {
+        type uint8;
+        mandatory true;
+        description "Option code.";
+      }
+      leaf space {
+        type string;
+        mandatory true;
+        description "Option space.";
+      }
+      uses dhcp:option-data-name;
+      uses dhcp:option-data-data;
+      uses dhcp:option-data-csv-format;
+      uses dhcp:option-data-always-send;
+      uses dhcp:option-data-never-send;
+      uses dhcp:option-data-user-context;
+    }
+  }
+
+  /*
+  * Data Nodes
+  */
+
+  container config {
+    // config true;
+    description "Contains DHCPv4 server configuration.";
+
+    uses dhcp:allocator;
+    uses dhcp:offer-lifetime;
+    uses dhcp:valid-lifetime;
+    uses dhcp:min-valid-lifetime;
+    uses dhcp:max-valid-lifetime;
+    uses dhcp:renew-timer;
+    uses dhcp:rebind-timer;
+    uses dhcp:calculate-tee-times;
+    uses dhcp:t1-percent;
+    uses dhcp:t2-percent;
+    uses dhcp:decline-probation-period;
+    uses subnet4-list;
+
+    list shared-network {
+      key name;
+      description "List of IPv4 shared networks.";
+      uses dhcp:network-name;
+      uses subnet4-list;
+      uses dhcp:allocator;
+      uses dhcp:offer-lifetime;
+      uses dhcp:network-interface;
+      uses dhcp:renew-timer;
+      uses dhcp:rebind-timer;
+      uses option-data-list;
+      uses match-client-id;
+      uses next-server;
+      uses server-hostname;
+      uses boot-file-name;
+      container relay {
+        description "Optional information about relay agent.";
+        uses relay;
+      }
+      uses authoritative;
+      uses dhcp:reservation-mode;
+      uses dhcp:network-client-class;
+      uses dhcp:network-require-client-classes;
+      uses dhcp:valid-lifetime;
+      uses dhcp:min-valid-lifetime;
+      uses dhcp:max-valid-lifetime;
+      uses dhcp:calculate-tee-times;
+      uses dhcp:t1-percent;
+      uses dhcp:t2-percent;
+      uses dhcp:cache-max-age;
+      uses dhcp:cache-threshold;
+      uses dhcp:ddns-generated-prefix;
+      uses dhcp:ddns-override-client-update;
+      uses dhcp:ddns-override-no-update;
+      uses dhcp:ddns-qualifying-suffix;
+      uses dhcp:ddns-replace-client-name;
+      uses dhcp:ddns-send-updates;
+      uses dhcp:ddns-ttl-percent;
+      uses dhcp:ddns-update-on-renew;
+      uses dhcp:ddns-use-conflict-resolution;
+      uses dhcp:hostname-char-replacement;
+      uses dhcp:hostname-char-set;
+      uses dhcp:reservations-global;
+      uses dhcp:reservations-in-subnet;
+      uses dhcp:reservations-out-of-pool;
+      uses dhcp:store-extended-info;
+      uses dhcp:network-user-context;
+    }
+
+    container interfaces-config {
+      description "Network interfaces configuration.";
+      leaf-list interfaces {
+        type string;
+        description "Name of the interface (e.g. eth0) or name/address
+                     (e.g. eth0/192.168.1.1) or * (use all interfaces).";
+      }
+      leaf dhcp-socket-type {
+        type enumeration {
+          enum "raw" {
+            description "DHCP service uses RAW sockets.";
+          }
+          enum "udp" {
+            description "DHCP service uses UDP sockets.";
+          }
+        }
+        description "Type of sockets to use.";
+      }
+      leaf outbound-interface {
+        type enumeration {
+          enum "same-as-inbound" {
+            description "Send the response on the interface where the query
+                         was received.";
+          }
+          enum "use-routing" {
+            description "Use kernel routing.";
+          }
+        }
+        description "Control the interface used to send a response.";
+      }
+      uses dhcp:interfaces-re-detect;
+      uses dhcp:interfaces-service-sockets-require-all;
+      uses dhcp:interfaces-service-sockets-max-retries;
+      uses dhcp:interfaces-service-sockets-retry-wait-time;
+      uses dhcp:interfaces-user-context;
+    }
+
+    uses dhcp:databases;
+
+    leaf-list host-reservation-identifiers {
+      type host-identifier-type;
+      description "Host reservation identifiers.";
+    }
+
+    uses client-classes;
+    uses option-def-list;
+    uses option-data-list;
+    uses kea:hooks-libraries;
+    uses dhcp:expired-leases-processing;
+    uses dhcp:dhcp4o6-port;
+    uses kea:control-socket;
+    uses dhcp:hostname-char-set;
+    uses dhcp:hostname-char-replacement;
+    uses dhcp:dhcp-ddns;
+
+    leaf echo-client-id {
+      type boolean;
+      description "Send client-id back when the client sent it. This
+                   is conformant with RFC6842, but some older, buggy
+                   clients have problems with it.";
+    }
+
+    uses match-client-id;
+    uses next-server;
+    uses server-hostname;
+    uses boot-file-name;
+    uses authoritative;
+    uses kea:user-context {
+      refine user-context {
+        description "DHCPv4 server user context. Arbitrary JSON data can
+                     be stored here.";
+      }
+    }
+    uses dhcp:sanity-checks;
+    uses dhcp:reservation-mode;
+    uses reservations {
+      refine host {
+        description "Global host reservations list.";
+      }
+    }
+    uses dhcp:config-control;
+    uses dhcp:server-tag;
+    uses dhcp:dhcp-queue-control;
+    uses kea:loggers;
+    uses dhcp:cache-max-age;
+    uses dhcp:cache-threshold;
+    container compatibility {
+      uses dhcp:common-compatibility;
+      uses dhcp:v4-compatibility;
+    }
+    uses dhcp:ddns-generated-prefix;
+    uses dhcp:ddns-override-client-update;
+    uses dhcp:ddns-override-no-update;
+    uses dhcp:ddns-qualifying-suffix;
+    uses dhcp:ddns-replace-client-name;
+    uses dhcp:ddns-send-updates;
+    uses dhcp:ddns-ttl-percent;
+    uses dhcp:ddns-update-on-renew;
+    uses dhcp:ddns-use-conflict-resolution;
+    uses dhcp:ip-reservations-unique;
+    uses dhcp:early-global-reservations-lookup;
+    uses dhcp:reservations-lookup-first;
+    uses dhcp:multi-threading;
+    uses dhcp:parked-packet-limit;
+    uses dhcp:reservations-global;
+    uses dhcp:reservations-in-subnet;
+    uses dhcp:reservations-out-of-pool;
+    uses dhcp:statistic-default-sample-age;
+    uses dhcp:statistic-default-sample-count;
+    uses dhcp:store-extended-info;
+  }
+
+  /*
+  * State data
+  */
+  container state {
+    config false;
+    description "State of Kea DHCPv4 server.";
+
+    container leases {
+      description "Kea DHCPv4 leases.";
+      list lease {
+        key ip-address;
+        description "List of Kea DHCPv4 leases.";
+        leaf ip-address {
+          type inet:ipv4-address;
+          mandatory true;
+          description "Lease IP address.";
+        }
+        leaf hw-address {
+          type binary;
+          mandatory true;
+          description "Lease hardware address.";
+        }
+        leaf client-id {
+          type binary;
+          description "Lease client-id.";
+        }
+        uses dhcp:valid-lifetime {
+          refine valid-lifetime {
+            mandatory true;
+          }
+        }
+        leaf cltt {
+          type uint32;
+          units "seconds";
+          mandatory true;
+          description "Lease client last transmission time.";
+        }
+        leaf subnet-id {
+          type uint32;
+          mandatory true;
+          description "Lease subnet ID.";
+        }
+        leaf fqdn-fwd {
+          type boolean;
+          description "Lease FQDN forward flag.";
+        }
+        leaf fqdn-rev {
+          type boolean;
+          description "Lease FQDN reverse lag.";
+        }
+        leaf hostname {
+          type string;
+          description "Lease hostname.";
+        }
+        leaf state {
+          type dhcp:lease-state;
+          description "Lease state.";
+        }
+        leaf user-context {
+          type kea:user-context;
+          description "Lease user context.";
+        }
+      }
+    }
+
+    container lease-stats {
+      description "Lease statistics.";
+      list subnet {
+        key subnet-id;
+        description "List of IPv4 subnets.";
+        leaf subnet-id {
+          type uint32;
+          mandatory true;
+          description "Subnet ID.";
+        }
+        leaf total-addresses {
+          type uint32;
+          mandatory true;
+          description "Total addresses counter.";
+        }
+        leaf assigned-addresses {
+          type uint32;
+          mandatory true;
+          description "Assigned addresses counter.";
+        }
+        leaf declined-addresses {
+          type uint32;
+          mandatory true;
+          description "Declined addresses counter.";
+        }
+      }
+    }
+
+    container hosts {
+      description "Kea DHCPv4 hosts.";
+      list host {
+        key "subnet-id identifier-type identifier";
+        description "List of Kea DHCPv4 hosts.";
+        uses host;
+        uses dhcp:host-subnet-id;
+        leaf auth-key {
+          type string;
+          description "Host authentication key (unused in DHCPv4).";
+        }
+      }
+    }
+  }
+}
diff --git a/src/share/yang/modules/kea-dhcp6-server@2023-06-28.yang b/src/share/yang/modules/kea-dhcp6-server@2023-06-28.yang
new file mode 100644
index 0000000..8f71620
--- /dev/null
+++ b/src/share/yang/modules/kea-dhcp6-server@2023-06-28.yang
@@ -0,0 +1,749 @@
+module kea-dhcp6-server {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:kea-dhcp6-server";
+  prefix "kea-dhcp6-server";
+
+  import ietf-inet-types {
+    prefix inet;
+  }
+  import kea-types {
+    prefix kea;
+    revision-date 2019-08-12;
+  }
+  import kea-dhcp-types {
+    prefix dhcp;
+    revision-date 2023-06-28;
+  }
+
+  organization "Internet Systems Consortium";
+  contact "kea-dev@lists.isc.org";
+  description "This model defines a YANG data model that can be
+               used to configure and manage a Kea DHCPv6 server.";
+
+  revision 2023-06-28 {
+    description "Added pool ID. Renamed statistic declined-nas to
+                 declined-addresses";
+  }
+
+  revision 2023-05-31 {
+    description "Added allocator, ddns-ttl-percent, pd-allocator,
+                 read-timeout, tcp-user-timeout, write-timeout.
+                 Removed contact-points, keyspace.";
+  }
+
+  revision 2022-12-27 {
+    description "Added never-send to option-data.";
+  }
+
+  revision 2022-11-30 {
+    description "Added the template-test node for client classes.";
+  }
+
+  revision 2022-07-27 {
+    description "Added TLS parameters for database connections: trust-anchor,
+                 cert-file, key-file, cipher-list. Added parameters which govern
+                 the way the server behaves regarding detection of configured
+                 interfaces: service-sockets-require-all,
+                 service-sockets-max-retries, service-sockets-retry-wait-time.
+                 Added parameters which govern reservations lookup:
+                 early-global-reservations-lookup, reservations-lookup-first.";
+  }
+
+  revision 2021-11-24 {
+    description "Fixed store-extended-info. Added several containers and leaves:
+                 compatibility, lenient-option-parsing, multi-threading,
+                 enable-multi-threading, packet-queue-size, thread-pool-size,
+                 valid-lifetime, min-valid-lifetime, max-valid-lifetime,
+                 preferred-lifetime, min-preferred-lifetime,
+                 max-preferred-lifetime, cache-max-age, cache-threshold,
+                 ddns-generated-prefix, ddns-override-client-update,
+                 ddns-override-no-update, ddns-qualifying-suffix,
+                 ddns-replace-client-name, ddns-send-updates,
+                 ddns-update-on-renew, ddns-use-conflict-resolution,
+                 ip-reservations-unique, parked-packet-limit,
+                 reservations-global, reservations-in-subnet,
+                 reservations-out-of-pool, statistic-default-sample-age,
+                 statistic-default-sample-count, store-extended-info, on-fail.";
+  }
+
+  revision 2021-08-25 {
+    description "Added store-extended-info";
+  }
+
+  revision 2019-08-12 {
+    description "Initial revision";
+  }
+
+  /*
+  * Typedefs
+  */
+  typedef host-identifier-type {
+    type enumeration {
+      enum "duid" {
+        description "DUID";
+      }
+      enum "hw-address" {
+        description "Hardware address";
+      }
+      enum "flex-id" {
+        description "Flexible identifier";
+      }
+    }
+    description "Host identifier type.";
+  }
+
+  /*
+  * Groupings
+  */
+  grouping data-directory {
+    description "Data directory grouping.";
+    leaf data-directory {
+      type string;
+      description "Server data directory.";
+    }
+  }
+
+  grouping preferred-lifetime {
+    description "Preferred lifetime grouping.";
+    leaf preferred-lifetime {
+      type uint32;
+      units "seconds";
+      description "Preferred lifetime.";
+    }
+  }
+
+  grouping min-preferred-lifetime {
+    description "Minimum preferred lifetime grouping.";
+    leaf min-preferred-lifetime {
+      type uint32;
+      units "seconds";
+      description "Minimum preferred lifetime.";
+    }
+  }
+
+  grouping max-preferred-lifetime {
+    description "Maximum preferred lifetime grouping.";
+    leaf max-preferred-lifetime {
+      type uint32;
+      units "seconds";
+      description "Maximum preferred lifetime.";
+    }
+  }
+
+  grouping interface-id {
+    description "Interface ID grouping.";
+    leaf interface-id {
+      type string;
+      description "Interface ID entry.";
+    }
+  }
+
+  grouping relay {
+    description "Relay grouping.";
+    leaf-list ip-addresses {
+      type inet:ipv6-address;
+      description "IPv6 addresses.";
+    }
+  }
+
+  grouping rapid-commit {
+    description "Rapid commit grouping.";
+    leaf rapid-commit {
+      type boolean;
+      description "Rapid commit entry.";
+    }
+  }
+
+  grouping host {
+    description "Host grouping.";
+    leaf identifier-type {
+      type host-identifier-type;
+      mandatory true;
+      description "Host identifier type.";
+    }
+    uses dhcp:host-identifier;
+    leaf-list ip-addresses {
+      type inet:ipv6-address;
+      description "Host reserved IP addresses.";
+    }
+    leaf-list prefixes {
+      type inet:ipv6-prefix;
+      description "Host reserved IP prefixes.";
+    }
+    uses dhcp:host-hostname;
+    uses dhcp:host-client-classes;
+    uses option-data-list;
+    uses dhcp:host-user-context;
+  }
+
+  grouping reservations {
+    description "Host reservations grouping.";
+    list host {
+      key "identifier-type identifier";
+      description "Host reservation list.";
+      uses host;
+    }
+  }
+
+  grouping subnet6-list {
+    description "Subnet6 list grouping.";
+    list subnet6 {
+      key id;
+      ordered-by user;
+      description "List of IPv6 subnets.";
+      uses dhcp:allocator;
+      uses dhcp:pd-allocator;
+      uses preferred-lifetime;
+      uses min-preferred-lifetime;
+      uses max-preferred-lifetime;
+      uses dhcp:valid-lifetime;
+      uses dhcp:min-valid-lifetime;
+      uses dhcp:max-valid-lifetime;
+      uses dhcp:renew-timer;
+      uses dhcp:rebind-timer;
+      uses dhcp:calculate-tee-times;
+      uses dhcp:t1-percent;
+      uses dhcp:t2-percent;
+      uses option-data-list;
+      list pool {
+        key "start-address end-address";
+        ordered-by user;
+        description "Pool list.";
+        leaf prefix {
+          type inet:ipv6-prefix;
+          description "Pool prefix.";
+        }
+        leaf start-address {
+          type inet:ipv6-address;
+          mandatory true;
+          description "First IPv6 address in a pool.";
+        }
+        leaf end-address {
+          type inet:ipv6-address;
+          mandatory true;
+          description "Last IPv6 address in a pool.";
+        }
+        uses option-data-list;
+        uses dhcp:pool-client-class;
+        uses dhcp:pool-require-client-classes;
+        uses dhcp:pool-id;
+        uses dhcp:pool-user-context;
+      }
+      list pd-pool {
+        key prefix;
+        ordered-by user;
+        description "Prefix delegation pool list.";
+        leaf prefix {
+          type inet:ipv6-prefix;
+          mandatory true;
+          description "IPv6 pool prefix.";
+        }
+        leaf delegated-len {
+          type uint8;
+          description "Prefix pool delegated length.";
+        }
+        uses option-data-list;
+        uses dhcp:client-class {
+          refine client-class {
+            description "Prefix pool client class guard. (only
+                         clients belonging to this class will be
+                         allowed in this pool).";
+          }
+        }
+        uses dhcp:require-client-classes {
+          refine require-client-classes {
+            description "Prefix pool require client classes.";
+          }
+        }
+        leaf excluded-prefix {
+          type inet:ipv6-prefix;
+          description "Prefix pool excluded prefix.";
+        }
+        uses dhcp:pool-id;
+        uses kea:user-context {
+          refine user-context {
+            description "Prefix pool user context. Arbitrary JSON data
+                         can be stored here.";
+          }
+        }
+      }
+      leaf subnet {
+        type inet:ipv6-prefix;
+        mandatory true;
+        description "IPv6 subnet prefix.";
+      }
+      uses dhcp:subnet-interface;
+      uses interface-id {
+        refine interface-id {
+          description "Subnet interface-id option.";
+        }
+      }
+      uses dhcp:subnet-id;
+      uses rapid-commit {
+        refine rapid-commit {
+          description "Subnet rapid commit flag.";
+        }
+      }
+      uses dhcp:subnet-client-class;
+      uses dhcp:require-client-classes;
+      uses reservations {
+        refine host {
+          description "Subnet host reservations list.";
+        }
+      }
+      uses dhcp:reservation-mode;
+      container relay {
+        description "Optional information about relay agent.";
+        uses relay;
+      }
+      uses dhcp:cache-max-age;
+      uses dhcp:cache-threshold;
+      uses dhcp:ddns-generated-prefix;
+      uses dhcp:ddns-override-client-update;
+      uses dhcp:ddns-override-no-update;
+      uses dhcp:ddns-qualifying-suffix;
+      uses dhcp:ddns-replace-client-name;
+      uses dhcp:ddns-send-updates;
+      uses dhcp:ddns-ttl-percent;
+      uses dhcp:ddns-update-on-renew;
+      uses dhcp:ddns-use-conflict-resolution;
+      uses dhcp:hostname-char-replacement;
+      uses dhcp:hostname-char-set;
+      uses dhcp:reservations-global;
+      uses dhcp:reservations-in-subnet;
+      uses dhcp:reservations-out-of-pool;
+      uses dhcp:store-extended-info;
+      uses dhcp:subnet-user-context;
+    }
+  }
+
+  grouping client-classes {
+    description "Client class grouping.";
+    list client-class {
+      key name;
+      ordered-by user;
+      description "List of client classes.";
+      uses dhcp:class-name;
+      uses dhcp:class-test;
+      uses dhcp:template-test;
+      uses dhcp:class-only-if-required;
+      uses option-data-list;
+      uses preferred-lifetime;
+      uses min-preferred-lifetime;
+      uses max-preferred-lifetime;
+      uses dhcp:valid-lifetime;
+      uses dhcp:min-valid-lifetime;
+      uses dhcp:max-valid-lifetime;
+      uses dhcp:class-user-context;
+    }
+  }
+
+  grouping option-def-list {
+    description "Option definition list grouping.";
+    list option-def {
+      key "code space";
+      description "Option definition entry.";
+      leaf code {
+        type uint16;
+        mandatory true;
+        description "Option code to be used by the new option definition.";
+      }
+      leaf space {
+        type string;
+        mandatory true;
+        description "Option space for the new option (typically dhcp6).";
+      }
+      uses dhcp:option-def-name;
+      uses dhcp:option-def-type;
+      uses dhcp:option-def-record-types;
+      uses dhcp:option-def-encapsulate;
+      uses dhcp:option-def-array;
+      uses dhcp:option-def-user-context;
+    }
+  }
+
+  grouping option-data-list {
+    description "Option data list grouping.";
+    list option-data {
+      key "code space";
+      description "Option data entry.";
+      leaf code {
+        type uint16;
+        mandatory true;
+        description "Option code.";
+      }
+      leaf space {
+        type string;
+        mandatory true;
+        description "Option space.";
+      }
+      uses dhcp:option-data-name;
+      uses dhcp:option-data-data;
+      uses dhcp:option-data-csv-format;
+      uses dhcp:option-data-always-send;
+      uses dhcp:option-data-never-send;
+      uses dhcp:option-data-user-context;
+    }
+  }
+
+  /*
+  * Data Nodes
+  */
+
+  container config {
+    // config true;
+    description "Contains DHCPv6 server configuration.";
+
+    uses dhcp:allocator;
+    uses dhcp:pd-allocator;
+    uses data-directory;
+    uses preferred-lifetime;
+    uses min-preferred-lifetime;
+    uses max-preferred-lifetime;
+    uses dhcp:valid-lifetime;
+    uses dhcp:min-valid-lifetime;
+    uses dhcp:max-valid-lifetime;
+    uses dhcp:renew-timer;
+    uses dhcp:rebind-timer;
+    uses dhcp:calculate-tee-times;
+    uses dhcp:t1-percent;
+    uses dhcp:t2-percent;
+    uses dhcp:decline-probation-period;
+    uses subnet6-list;
+
+    list shared-network {
+      key name;
+      uses dhcp:network-name;
+      description "List of IPv4 shared networks.";
+      uses dhcp:allocator;
+      uses dhcp:pd-allocator;
+      uses subnet6-list;
+      uses dhcp:network-interface;
+      uses interface-id {
+        refine interface-id {
+          description "Shared network interface-id option.";
+        }
+      }
+      uses dhcp:renew-timer;
+      uses dhcp:rebind-timer;
+      uses option-data-list;
+      container relay {
+        description "Optional information about relay agent.";
+        uses relay;
+      }
+      uses dhcp:reservation-mode;
+      uses dhcp:network-client-class;
+      uses dhcp:require-client-classes;
+      uses preferred-lifetime;
+      uses min-preferred-lifetime;
+      uses max-preferred-lifetime;
+      uses rapid-commit {
+        refine rapid-commit {
+          description "Shared network rapid commit flag.";
+        }
+      }
+      uses dhcp:valid-lifetime;
+      uses dhcp:min-valid-lifetime;
+      uses dhcp:max-valid-lifetime;
+      uses dhcp:calculate-tee-times;
+      uses dhcp:t1-percent;
+      uses dhcp:t2-percent;
+      uses dhcp:cache-max-age;
+      uses dhcp:cache-threshold;
+      uses dhcp:ddns-generated-prefix;
+      uses dhcp:ddns-override-client-update;
+      uses dhcp:ddns-override-no-update;
+      uses dhcp:ddns-qualifying-suffix;
+      uses dhcp:ddns-replace-client-name;
+      uses dhcp:ddns-send-updates;
+      uses dhcp:ddns-ttl-percent;
+      uses dhcp:ddns-update-on-renew;
+      uses dhcp:ddns-use-conflict-resolution;
+      uses dhcp:hostname-char-replacement;
+      uses dhcp:hostname-char-set;
+      uses dhcp:reservations-global;
+      uses dhcp:reservations-in-subnet;
+      uses dhcp:reservations-out-of-pool;
+      uses dhcp:store-extended-info;
+      uses dhcp:network-user-context;
+    }
+
+    container interfaces-config {
+      description "Network interfaces configuration.";
+      leaf-list interfaces {
+        type string;
+        description "Name of the interface (e.g. eth0) or name/address
+                     (e.g. eth0/2001:db8::1) or * (use all interfaces).";
+      }
+      uses dhcp:interfaces-re-detect;
+      uses dhcp:interfaces-service-sockets-require-all;
+      uses dhcp:interfaces-service-sockets-max-retries;
+      uses dhcp:interfaces-service-sockets-retry-wait-time;
+      uses dhcp:interfaces-user-context;
+    }
+
+    uses dhcp:databases;
+
+    leaf-list relay-supplied-options {
+      type string;
+      description "Relay supplied options.";
+    }
+
+    leaf-list mac-sources {
+      type string;
+      description "MAC address sources.";
+    }
+
+    leaf-list host-reservation-identifiers {
+      type host-identifier-type;
+      description "Host reservation identifiers.";
+    }
+
+    uses client-classes;
+    uses option-def-list;
+    uses option-data-list;
+    uses kea:hooks-libraries;
+    uses dhcp:expired-leases-processing;
+
+    container server-id {
+      presence "Have server ID.";
+      description "Server DUID.";
+      leaf type {
+        type enumeration {
+          enum "LLT" {
+            description "Link-layer address and timestamp.";
+          }
+          enum "EN" {
+            description "Enterprise number.";
+          }
+          enum "LL" {
+            description "Link-layer address.";
+          }
+        }
+        description "Server DIOD type.";
+      }
+      leaf identifier {
+        type string;
+        description "Server DUID identifier.";
+      }
+      leaf time {
+        type uint32;
+        description "Server DUID time.";
+      }
+      leaf htype {
+        type uint16;
+        description "Server DUID hardware type.";
+      }
+      leaf enterprise-id {
+        type uint32;
+        description "Server DUID enterprise ID.";
+      }
+      leaf persist {
+        type boolean;
+        description "Server DUID persist flag.";
+      }
+      leaf user-context {
+        type kea:user-context;
+        description "Server DUID user context.";
+      }
+    }
+
+    uses dhcp:dhcp4o6-port;
+    uses kea:control-socket;
+    uses dhcp:hostname-char-set;
+    uses dhcp:hostname-char-replacement;
+    uses dhcp:dhcp-ddns;
+    uses kea:user-context {
+      refine user-context {
+        description "DHCPv6 server user context. Arbitrary JSON data can
+                     be stored here.";
+      }
+    }
+    uses dhcp:sanity-checks;
+    uses dhcp:reservation-mode;
+    uses reservations {
+      refine host {
+        description "Global host reservations list.";
+      }
+    }
+    uses dhcp:config-control;
+    uses dhcp:server-tag;
+    uses dhcp:dhcp-queue-control;
+    uses kea:loggers;
+    uses dhcp:cache-max-age;
+    uses dhcp:cache-threshold;
+    container compatibility {
+      uses dhcp:common-compatibility;
+    }
+    uses dhcp:ddns-generated-prefix;
+    uses dhcp:ddns-override-client-update;
+    uses dhcp:ddns-override-no-update;
+    uses dhcp:ddns-qualifying-suffix;
+    uses dhcp:ddns-replace-client-name;
+    uses dhcp:ddns-send-updates;
+    uses dhcp:ddns-ttl-percent;
+    uses dhcp:ddns-update-on-renew;
+    uses dhcp:ddns-use-conflict-resolution;
+    uses dhcp:ip-reservations-unique;
+    uses dhcp:early-global-reservations-lookup;
+    uses dhcp:reservations-lookup-first;
+    uses dhcp:multi-threading;
+    uses dhcp:parked-packet-limit;
+    uses dhcp:reservations-global;
+    uses dhcp:reservations-in-subnet;
+    uses dhcp:reservations-out-of-pool;
+    uses dhcp:statistic-default-sample-age;
+    uses dhcp:statistic-default-sample-count;
+    uses dhcp:store-extended-info;
+  }
+
+  /*
+  * State data
+  */
+  container state {
+    config false;
+    description "State of Kea DHCPv6 server.";
+
+    container leases {
+      description "Kea DHCPv6 leases.";
+      list lease {
+        key ip-address;
+        description "List of Kea DHCPv6 leases.";
+        leaf ip-address {
+          type inet:ipv6-address;
+          mandatory true;
+          description "Lease IP address.";
+        }
+        leaf duid {
+          type binary;
+          mandatory true;
+          description "Lease DUID.";
+        }
+        uses dhcp:valid-lifetime {
+          refine valid-lifetime {
+            mandatory true;
+          }
+        }
+        leaf cltt {
+          type uint32;
+          units "seconds";
+          mandatory true;
+          description "Lease client last transmission time.";
+        }
+        leaf subnet-id {
+          type uint32;
+          mandatory true;
+          description "Lease subnet ID.";
+        }
+        leaf preferred-lifetime {
+          type uint32;
+          units "seconds";
+          mandatory true;
+          description "Lease preferred lifetime.";
+        }
+        leaf lease-type {
+          type enumeration {
+            enum "IA_NA" {
+              description "Identity association for non-temporary addresses.";
+            }
+            enum "IA_TA" {
+              description "Identity association for temporary addresses.";
+            }
+            enum "IA_PD" {
+              description "Identity association for prefix delegation.";
+            }
+          }
+          mandatory true;
+          description "Lease IA type.";
+        }
+        leaf iaid {
+          type uint32;
+          mandatory true;
+          description "Lease IA ID.";
+        }
+        leaf prefix-length {
+          type uint8 {
+            range 0..128;
+          }
+          description "Lease prefix length.";
+        }
+        leaf fqdn-fwd {
+          type boolean;
+          description "Lease FQDN forward flag.";
+        }
+        leaf fqdn-rev {
+          type boolean;
+          description "Lease FQDN reverse lag.";
+        }
+        leaf hostname {
+          type string;
+          description "Lease hostname.";
+        }
+        leaf state {
+          type dhcp:lease-state;
+          description "Lease state.";
+        }
+        leaf user-context {
+          type kea:user-context;
+          description "Lease user context.";
+        }
+        leaf hw-address {
+          type string;
+          description "Lease hardware address.";
+        }
+      }
+    }
+
+    container lease-stats {
+      description "Lease statistics.";
+      list subnet {
+        key subnet-id;
+        description "List of IPv6 subnets.";
+        leaf subnet-id {
+          type uint32;
+          mandatory true;
+          description "Subnet ID.";
+        }
+        leaf total-nas {
+          type uint32;
+          mandatory true;
+          description "Total non-temporary addresses counter.";
+        }
+        leaf assigned-nas {
+          type uint32;
+          mandatory true;
+          description "Assigned non-temporary counter.";
+        }
+        leaf declined-addresses {
+          type uint32;
+          mandatory true;
+          description "Declined non-temporary addresses counter.";
+        }
+        leaf total-pds {
+          type uint32;
+          mandatory true;
+          description "Total delegated prefixes counter.";
+        }
+        leaf assigned-pds {
+          type uint32;
+          mandatory true;
+          description "Assigned delegated prefixe counter.";
+        }
+      }
+    }
+
+    container hosts {
+      description "Kea DHCPv6 hosts.";
+      list host {
+        key "subnet-id identifier-type identifier";
+        description "List of Kea DHCPv6 hosts.";
+        uses host;
+        uses dhcp:host-subnet-id;
+        leaf auth-key {
+          type string;
+          description "Host authentication key.";
+        }
+      }
+    }
+  }
+}
diff --git a/src/share/yang/modules/kea-types@2019-08-12.yang b/src/share/yang/modules/kea-types@2019-08-12.yang
new file mode 100644
index 0000000..a19c18f
--- /dev/null
+++ b/src/share/yang/modules/kea-types@2019-08-12.yang
@@ -0,0 +1,159 @@
+module kea-types {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:kea-types";
+  prefix "kea-types";
+
+  organization "Internet Systems Consortium";
+  contact "kea-dev@lists.isc.org";
+  description "This file defines some commonly used Kea types and groupings.";
+
+  revision 2019-08-12 {
+    description "Initial revision";
+  }
+
+  /*
+  * Typedef
+  */
+  typedef user-context {
+    type string;
+    description "User context (JSON map).";
+  }
+
+  /*
+  * Grouping
+  */
+  grouping user-context {
+    description "User context grouping.";
+    leaf user-context {
+      type user-context;
+      description "User context entry.";
+    }
+  }
+
+  grouping control-socket-info {
+    description "Control socket parameters.";
+    leaf socket-name {
+      type string;
+      mandatory true;
+      description "Path to the UNIX socket.";
+    }
+    leaf socket-type {
+      type enumeration {
+        enum "unix" {
+          description "Unix socket type.";
+        }
+      }
+      mandatory true;
+      description "Socket type.";
+    }
+    leaf user-context {
+      type user-context;
+      description "Control socket user context.";
+    }
+  }
+
+  grouping control-socket {
+    description "Control socket grouping.";
+    container control-socket {
+      presence "Have control socket.";
+      description "Control socket container.";
+      uses control-socket-info;
+    }
+  }
+
+  grouping hooks-libraries {
+    description "Hooks libraries grouping.";
+    list hook-library {
+      key library;
+      description "List of hook library.";
+      leaf library {
+        type string;
+        mandatory true;
+        description "Path to the DSO.";
+      }
+      leaf parameters {
+        type string;
+        description "Parameters (JSON value).";
+      }
+    }
+  }
+
+  grouping loggers {
+    description "Loggers.";
+    list logger {
+      key name;
+      description "List of loggers.";
+      leaf name {
+        type string;
+        mandatory true;
+        description "Name of the logger.";
+      }
+      list output-option {
+        key output;
+        description "List of output options.";
+        leaf output {
+          type string;
+          description "Type of output. Special values are stdout (standard
+            output), stderr (standard error), syslog (syslog using default
+            name), syslog:name (syslog using specified name). Any other
+            value is interpreted as a filename.";
+        }
+        leaf flush {
+          type boolean;
+          description "When true flush buffers after each message.";
+        }
+        leaf maxsize {
+          type uint32;
+          description "Maximum size of output file before rotation.
+            Values below 204800 including 0 disable rotation.";
+        }
+        leaf maxver {
+          type uint32 {
+            range 1..max;
+          }
+          description "Maximum version to keep a rotated output file.";
+        }
+        leaf pattern {
+          type string;
+          description "Custom log layout.";
+        }
+      }
+      leaf debuglevel {
+        type uint8 {
+          range 0..99;
+        }
+        description "What level of debug messages should be printed.";
+      }
+      leaf severity {
+        type enumeration {
+          enum "FATAL" {
+            description "Condition is so serious that the server cannot
+              continue executing";
+          }
+          enum "ERROR" {
+            description "Error condition. The server will continue
+              executing, but the results may not be as expected.";
+          }
+          enum "WARN" {
+            description "Out of the ordinary condition. However, the server
+              will continue executing normally.";
+          }
+          enum "INFO" {
+            description "Information message marking some event.";
+          }
+          enum "DEBUG" {
+            description "For debugging purposes.";
+          }
+          enum "NONE" {
+            description "All messages are inhibited.";
+          }
+        }
+        description "Category of messages logged.";
+      }
+      leaf user-context {
+        type user-context;
+        description "Logger user context.";
+      }
+    }
+  }
+}
diff --git a/src/share/yang/modules/keatest-module@2022-11-30.yang b/src/share/yang/modules/keatest-module@2022-11-30.yang
new file mode 100644
index 0000000..8042b26
--- /dev/null
+++ b/src/share/yang/modules/keatest-module@2022-11-30.yang
@@ -0,0 +1,251 @@
+module keatest-module {
+  yang-version 1.1;
+  namespace "urn:ietf:params:xml:ns:yang:keatest-module";
+  prefix tm;
+
+  organization "Sysrepo and ISC";
+  description
+    "ISC imported a test module from Sysrepo tests and adapted it
+     to kea testing regime.";
+  contact
+    "kea-dev@lists.isc.org";
+
+  revision 2022-11-30 {
+    description
+      "Added leafrefs and empty leaf.";
+  }
+
+  revision 2018-11-20 {
+    description "Initial revision";
+    reference "";
+  }
+
+  container container {
+      config true;
+      list list {
+         leaf leaf {
+            type string;
+         }
+         leaf key1 {
+            type string;
+         }
+         leaf key2 {
+            type string;
+         }
+         key "key1 key2";
+      }
+  }
+
+  container main {
+    leaf enum {
+      type enumeration {
+        enum "yes" {
+          value 1;
+        }
+        enum "no" {
+          value 2;
+        }
+        enum "maybe" {
+          value 3;
+        }
+      }
+    }
+    leaf options {
+      type bits {
+        bit strict;
+        bit recursive;
+        bit logging;
+      }
+    }
+    leaf raw {
+      type binary;
+    }
+    leaf dec64 {
+      type decimal64{
+         fraction-digits 2;
+      }
+    }
+    leaf i8 {
+      type int8;
+    }
+    leaf i16 {
+      type int16;
+    }
+    leaf i32 {
+      type int32;
+    }
+    leaf i64 {
+      type int64;
+    }
+    leaf ui8 {
+      type uint8;
+    }
+    leaf ui16 {
+      type uint16;
+    }
+    leaf ui32 {
+      type uint32;
+    }
+    leaf ui64 {
+      type uint64;
+    }
+    leaf empty {
+      type empty;
+    }
+    leaf boolean {
+      type boolean;
+    }
+    leaf string {
+      type string;
+    }
+    leaf id_ref {
+      type identityref {
+        base base_id;
+      }
+    }
+    leaf-list numbers {
+      type uint8;
+    }
+    leaf instance_id {
+      type instance-identifier;
+    }
+    leaf union {
+      type union {
+          type uint8;
+          type enumeration {
+              enum "infinity";
+          }
+      }
+    }
+    leaf leafref-i8 {
+      type leafref {
+        path "/main/i8";
+      }
+    }
+    leaf leafref-raw {
+      type leafref {
+        path "/main/raw";
+      }
+    }
+    leaf leafref-string {
+      type leafref {
+        path "/main/string";
+      }
+    }
+    anyxml xml-data;
+    anydata any-data;
+  }
+
+  identity base_id;
+
+  identity id_1 {
+    base base_id;
+  }
+
+  identity id_2 {
+    base base_id;
+  }
+
+  list list {
+    key "key";
+    leaf key {
+      type string;
+    }
+    leaf id_ref {
+      type identityref {
+        base base_id;
+      }
+    }
+    leaf instance_id {
+       type instance-identifier;
+    }
+    leaf empty {
+      type empty;
+    }
+  }
+
+  container kernel-modules {
+    list kernel-module {
+      key "name";
+
+      leaf name {
+        type string;
+      }
+
+      leaf location {
+        type string;
+        default "/lib/modules";
+      }
+
+      leaf loaded {
+        type boolean;
+      }
+
+      action load {
+        input {
+          leaf params {
+            mandatory "true";
+            type string;
+          }
+          leaf force {
+            type boolean;
+            default "false";
+            when "../../loaded = 'false'";
+          }
+          leaf dry-run {
+            type boolean;
+            default false;
+          }
+        }
+        output {
+          leaf return-code {
+            type uint8;
+          }
+        }
+      }
+    }
+  }
+
+ container presence-container {
+   presence "presence-container";
+
+    leaf topleaf1 {
+      type int8;
+    }
+
+    leaf topleaf2 {
+      type int8;
+    }
+
+    container child1 {
+      leaf child1-leaf {
+        type int8;
+      }
+
+      container grandchild1 {
+        leaf grandchild1-leaf {
+          type int8;
+          default 10;
+        }
+      }
+    }
+
+    container child2 {
+      leaf child2-leaf {
+        type int8;
+       }
+
+      container grandchild2 {
+        leaf grandchild2-leaf1 {
+          type int8;
+        }
+        leaf grandchild2-leaf2 {
+          type int8;
+        }
+        leaf grandchild2-leaf3 {
+          type int8;
+        }
+      }
+    }
+  }
+}
diff --git a/src/share/yang/modules/utils/Makefile.am b/src/share/yang/modules/utils/Makefile.am
new file mode 100644
index 0000000..fef578e
--- /dev/null
+++ b/src/share/yang/modules/utils/Makefile.am
@@ -0,0 +1,31 @@
+SUBDIRS = .
+
+yangdir = ${datarootdir}/${PACKAGE_NAME}/yang/modules/utils
+
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+yang_list += check-hashes.sh
+yang_list += check-revisions.sh
+
+EXTRA_DIST = ${yang_list}
+
+if HAVE_NETCONF
+
+yang_SCRIPTS = reinstall.sh
+
+# Shell tests
+SHTESTS  =
+SHTESTS += check-hashes.sh
+SHTESTS += check-revisions.sh
+
+if HAVE_GTEST
+
+# Run shell tests on "make check".
+check_SCRIPTS = $(SHTESTS)
+TESTS = $(SHTESTS)
+
+endif
+
+# Don't install shell tests.
+noinst_SCRIPTS = $(SHTESTS)
+
+endif
diff --git a/src/share/yang/modules/utils/Makefile.in b/src/share/yang/modules/utils/Makefile.in
new file mode 100644
index 0000000..b43e721
--- /dev/null
+++ b/src/share/yang/modules/utils/Makefile.in
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+localstatedir = @localstatedir@
+mandir = @mandir@
+mkdir_p = @mkdir_p@
+oldincludedir = @oldincludedir@
+pdfdir = @pdfdir@
+pkgpyexecdir = @pkgpyexecdir@
+pkgpythondir = @pkgpythondir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+pyexecdir = @pyexecdir@
+pythondir = @pythondir@
+runstatedir = @runstatedir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+SUBDIRS = .
+yangdir = ${datarootdir}/${PACKAGE_NAME}/yang/modules/utils
+yang_list = check-hashes.sh check-revisions.sh
+EXTRA_DIST = ${yang_list}
+@HAVE_NETCONF_TRUE@yang_SCRIPTS = reinstall.sh
+
+# Shell tests
+@HAVE_NETCONF_TRUE@SHTESTS = check-hashes.sh check-revisions.sh
+
+# Run shell tests on "make check".
+@HAVE_GTEST_TRUE@@HAVE_NETCONF_TRUE@check_SCRIPTS = $(SHTESTS)
+@HAVE_GTEST_TRUE@@HAVE_NETCONF_TRUE@TESTS = $(SHTESTS)
+
+# Don't install shell tests.
+@HAVE_NETCONF_TRUE@noinst_SCRIPTS = $(SHTESTS)
+all: all-recursive
+
+.SUFFIXES:
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/share/yang/modules/utils/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/share/yang/modules/utils/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+check-hashes.sh: $(top_builddir)/config.status $(srcdir)/check-hashes.sh.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+check-revisions.sh: $(top_builddir)/config.status $(srcdir)/check-revisions.sh.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+reinstall.sh: $(top_builddir)/config.status $(srcdir)/reinstall.sh.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+install-yangSCRIPTS: $(yang_SCRIPTS)
+	@$(NORMAL_INSTALL)
+	@list='$(yang_SCRIPTS)'; test -n "$(yangdir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(yangdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(yangdir)" || exit 1; \
+	fi; \
+	for p in $$list; do \
+	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \
+	  if test -f "$$d$$p"; then echo "$$d$$p"; echo "$$p"; else :; fi; \
+	done | \
+	sed -e 'p;s,.*/,,;n' \
+	    -e 'h;s|.*|.|' \
+	    -e 'p;x;s,.*/,,;$(transform)' | sed 'N;N;N;s,\n, ,g' | \
+	$(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1; } \
+	  { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \
+	    if ($$2 == $$4) { files[d] = files[d] " " $$1; \
+	      if (++n[d] == $(am__install_max)) { \
+		print "f", d, files[d]; n[d] = 0; files[d] = "" } } \
+	    else { print "f", d "/" $$4, $$1 } } \
+	  END { for (d in files) print "f", d, files[d] }' | \
+	while read type dir files; do \
+	     if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \
+	     test -z "$$files" || { \
+	       echo " $(INSTALL_SCRIPT) $$files '$(DESTDIR)$(yangdir)$$dir'"; \
+	       $(INSTALL_SCRIPT) $$files "$(DESTDIR)$(yangdir)$$dir" || exit $$?; \
+	     } \
+	; done
+
+uninstall-yangSCRIPTS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(yang_SCRIPTS)'; test -n "$(yangdir)" || exit 0; \
+	files=`for p in $$list; do echo "$$p"; done | \
+	       sed -e 's,.*/,,;$(transform)'`; \
+	dir='$(DESTDIR)$(yangdir)'; $(am__uninstall_files_from_dir)
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+# This directory's subdirectories are mostly independent; you can cd
+# into them and run 'make' without going through this Makefile.
+# To change the values of 'make' variables: instead of editing Makefiles,
+# (1) if the variable is set in 'config.status', edit 'config.status'
+#     (which will cause the Makefiles to be regenerated when you run 'make');
+# (2) otherwise, pass the desired values on the 'make' command line.
+$(am__recursive_targets):
+	@fail=; \
+	if $(am__make_keepgoing); then \
+	  failcom='fail=yes'; \
+	else \
+	  failcom='exit 1'; \
+	fi; \
+	dot_seen=no; \
+	target=`echo $@ | sed s/-recursive//`; \
+	case "$@" in \
+	  distclean-* | maintainer-clean-*) list='$(DIST_SUBDIRS)' ;; \
+	  *) list='$(SUBDIRS)' ;; \
+	esac; \
+	for subdir in $$list; do \
+	  echo "Making $$target in $$subdir"; \
+	  if test "$$subdir" = "."; then \
+	    dot_seen=yes; \
+	    local_target="$$target-am"; \
+	  else \
+	    local_target="$$target"; \
+	  fi; \
+	  ($(am__cd) $$subdir && $(MAKE) $(AM_MAKEFLAGS) $$local_target) \
+	  || eval $$failcom; \
+	done; \
+	if test "$$dot_seen" = "no"; then \
+	  $(MAKE) $(AM_MAKEFLAGS) "$$target-am" || exit 1; \
+	fi; test -z "$$fail"
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-recursive
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	if ($(ETAGS) --etags-include --version) >/dev/null 2>&1; then \
+	  include_option=--etags-include; \
+	  empty_fix=.; \
+	else \
+	  include_option=--include; \
+	  empty_fix=; \
+	fi; \
+	list='$(SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    test ! -f $$subdir/TAGS || \
+	      set "$$@" "$$include_option=$$here/$$subdir/TAGS"; \
+	  fi; \
+	done; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-recursive
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-recursive
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+check-TESTS: $(TESTS)
+	@failed=0; all=0; xfail=0; xpass=0; skip=0; \
+	srcdir=$(srcdir); export srcdir; \
+	list=' $(TESTS) '; \
+	$(am__tty_colors); \
+	if test -n "$$list"; then \
+	  for tst in $$list; do \
+	    if test -f ./$$tst; then dir=./; \
+	    elif test -f $$tst; then dir=; \
+	    else dir="$(srcdir)/"; fi; \
+	    if $(TESTS_ENVIRONMENT) $${dir}$$tst $(AM_TESTS_FD_REDIRECT); then \
+	      all=`expr $$all + 1`; \
+	      case " $(XFAIL_TESTS) " in \
+	      *[\ \	]$$tst[\ \	]*) \
+		xpass=`expr $$xpass + 1`; \
+		failed=`expr $$failed + 1`; \
+		col=$$red; res=XPASS; \
+	      ;; \
+	      *) \
+		col=$$grn; res=PASS; \
+	      ;; \
+	      esac; \
+	    elif test $$? -ne 77; then \
+	      all=`expr $$all + 1`; \
+	      case " $(XFAIL_TESTS) " in \
+	      *[\ \	]$$tst[\ \	]*) \
+		xfail=`expr $$xfail + 1`; \
+		col=$$lgn; res=XFAIL; \
+	      ;; \
+	      *) \
+		failed=`expr $$failed + 1`; \
+		col=$$red; res=FAIL; \
+	      ;; \
+	      esac; \
+	    else \
+	      skip=`expr $$skip + 1`; \
+	      col=$$blu; res=SKIP; \
+	    fi; \
+	    echo "$${col}$$res$${std}: $$tst"; \
+	  done; \
+	  if test "$$all" -eq 1; then \
+	    tests="test"; \
+	    All=""; \
+	  else \
+	    tests="tests"; \
+	    All="All "; \
+	  fi; \
+	  if test "$$failed" -eq 0; then \
+	    if test "$$xfail" -eq 0; then \
+	      banner="$$All$$all $$tests passed"; \
+	    else \
+	      if test "$$xfail" -eq 1; then failures=failure; else failures=failures; fi; \
+	      banner="$$All$$all $$tests behaved as expected ($$xfail expected $$failures)"; \
+	    fi; \
+	  else \
+	    if test "$$xpass" -eq 0; then \
+	      banner="$$failed of $$all $$tests failed"; \
+	    else \
+	      if test "$$xpass" -eq 1; then passes=pass; else passes=passes; fi; \
+	      banner="$$failed of $$all $$tests did not behave as expected ($$xpass unexpected $$passes)"; \
+	    fi; \
+	  fi; \
+	  dashes="$$banner"; \
+	  skipped=""; \
+	  if test "$$skip" -ne 0; then \
+	    if test "$$skip" -eq 1; then \
+	      skipped="($$skip test was not run)"; \
+	    else \
+	      skipped="($$skip tests were not run)"; \
+	    fi; \
+	    test `echo "$$skipped" | wc -c` -le `echo "$$banner" | wc -c` || \
+	      dashes="$$skipped"; \
+	  fi; \
+	  report=""; \
+	  if test "$$failed" -ne 0 && test -n "$(PACKAGE_BUGREPORT)"; then \
+	    report="Please report to $(PACKAGE_BUGREPORT)"; \
+	    test `echo "$$report" | wc -c` -le `echo "$$banner" | wc -c` || \
+	      dashes="$$report"; \
+	  fi; \
+	  dashes=`echo "$$dashes" | sed s/./=/g`; \
+	  if test "$$failed" -eq 0; then \
+	    col="$$grn"; \
+	  else \
+	    col="$$red"; \
+	  fi; \
+	  echo "$${col}$$dashes$${std}"; \
+	  echo "$${col}$$banner$${std}"; \
+	  test -z "$$skipped" || echo "$${col}$$skipped$${std}"; \
+	  test -z "$$report" || echo "$${col}$$report$${std}"; \
+	  echo "$${col}$$dashes$${std}"; \
+	  test "$$failed" -eq 0; \
+	else :; fi
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) $(check_SCRIPTS)
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-recursive
+all-am: Makefile $(SCRIPTS)
+installdirs: installdirs-recursive
+installdirs-am:
+	for dir in "$(DESTDIR)$(yangdir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-recursive
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am: install-yangSCRIPTS
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am: uninstall-yangSCRIPTS
+
+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am check \
+	check-TESTS check-am clean clean-generic clean-libtool \
+	cscopelist-am ctags ctags-am distclean distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip install-yangSCRIPTS \
+	installcheck installcheck-am installdirs installdirs-am \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am uninstall-yangSCRIPTS
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/share/yang/modules/utils/check-hashes.sh b/src/share/yang/modules/utils/check-hashes.sh
new file mode 100755
index 0000000..efe9c5e
--- /dev/null
+++ b/src/share/yang/modules/utils/check-hashes.sh
@@ -0,0 +1,67 @@
+#!/bin/sh
+
+# Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Check hashes
+#
+# This developer script verifies recorded hashes still match the
+# result of SHA-256 checksums of the YIN format.
+# Requires yanglint to translate YANG to YIN formats and openssl
+# for a system independent SHA-256.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Change directory to the YANG modules' directory.
+cd "/home/admin/workspace/kea-2.4/build-tarball/kea/src/share/yang/modules"
+
+amend=false
+if test "${1-}" = '-a' || test "${1-}" = '--amend'; then
+    amend=true
+fi
+
+exit_code=0
+
+LIBYANG_PREFIX=''
+
+# Find yanglint.
+if test -f "${LIBYANG_PREFIX}/bin/yanglint"; then
+    yanglint="${LIBYANG_PREFIX}/bin/yanglint"
+    LD_LIBRARY_PATH="${LD_LIBRARY_PATH-}:${LIBYANG_PREFIX}/lib:${LIBYANG_PREFIX}/lib64"
+    export LD_LIBRARY_PATH
+elif command -v yanglint; then
+    yanglint='yanglint'
+else
+    exit_code=$((exit_code | 2))
+    printf 'ERROR: cannot find yanglint.\n' >&2
+    exit "${exit_code}"
+fi
+
+for m in *.yang; do
+    hash1=$("${yanglint}" -f yin "${m}" | openssl dgst -sha256 | sed 's/(stdin)= //' | sed 's/SHA2-256//')
+    h="hashes/$(basename "${m}" .yang).hash"
+    if test -f "${h}"; then
+        hash2=$(cat "${h}")
+        if test "$hash1" != "$hash2"
+        then
+            exit_code=$((exit_code | 4))
+            printf 'ERROR: hash mismatch on %s expected %s in %s\n' "${m}" "${hash1}" "${h}" >&2
+            if "${amend}"; then
+                printf '%s\n' "${hash1}" > "${h}"
+            fi
+        fi
+    else
+        exit_code=$((exit_code | 8))
+        printf 'ERROR: missing hash file %s for %s\n' "${h}" "${m}" >&2
+        if "${amend}"; then
+            printf '%s\n' "${hash1}" > "${h}"
+        fi
+    fi
+done
+
+exit "${exit_code}"
diff --git a/src/share/yang/modules/utils/check-hashes.sh.in b/src/share/yang/modules/utils/check-hashes.sh.in
new file mode 100644
index 0000000..8ca411f
--- /dev/null
+++ b/src/share/yang/modules/utils/check-hashes.sh.in
@@ -0,0 +1,67 @@
+#!/bin/sh
+
+# Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Check hashes
+#
+# This developer script verifies recorded hashes still match the
+# result of SHA-256 checksums of the YIN format.
+# Requires yanglint to translate YANG to YIN formats and openssl
+# for a system independent SHA-256.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Change directory to the YANG modules' directory.
+cd "@abs_top_srcdir@/src/share/yang/modules"
+
+amend=false
+if test "${1-}" = '-a' || test "${1-}" = '--amend'; then
+    amend=true
+fi
+
+exit_code=0
+
+LIBYANG_PREFIX='@LIBYANG_PREFIX@'
+
+# Find yanglint.
+if test -f "${LIBYANG_PREFIX}/bin/yanglint"; then
+    yanglint="${LIBYANG_PREFIX}/bin/yanglint"
+    LD_LIBRARY_PATH="${LD_LIBRARY_PATH-}:${LIBYANG_PREFIX}/lib:${LIBYANG_PREFIX}/lib64"
+    export LD_LIBRARY_PATH
+elif command -v yanglint; then
+    yanglint='yanglint'
+else
+    exit_code=$((exit_code | 2))
+    printf 'ERROR: cannot find yanglint.\n' >&2
+    exit "${exit_code}"
+fi
+
+for m in *.yang; do
+    hash1=$("${yanglint}" -f yin "${m}" | openssl dgst -sha256 | sed 's/(stdin)= //' | sed 's/SHA2-256//')
+    h="hashes/$(basename "${m}" .yang).hash"
+    if test -f "${h}"; then
+        hash2=$(cat "${h}")
+        if test "$hash1" != "$hash2"
+        then
+            exit_code=$((exit_code | 4))
+            printf 'ERROR: hash mismatch on %s expected %s in %s\n' "${m}" "${hash1}" "${h}" >&2
+            if "${amend}"; then
+                printf '%s\n' "${hash1}" > "${h}"
+            fi
+        fi
+    else
+        exit_code=$((exit_code | 8))
+        printf 'ERROR: missing hash file %s for %s\n' "${h}" "${m}" >&2
+        if "${amend}"; then
+            printf '%s\n' "${hash1}" > "${h}"
+        fi
+    fi
+done
+
+exit "${exit_code}"
diff --git a/src/share/yang/modules/utils/check-revisions.sh b/src/share/yang/modules/utils/check-revisions.sh
new file mode 100755
index 0000000..e5af0b6
--- /dev/null
+++ b/src/share/yang/modules/utils/check-revisions.sh
@@ -0,0 +1,52 @@
+#!/bin/sh
+
+# Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Check revisions
+#
+# This developer script verifies versions in module contents match
+# the version in the name.
+# Requires yanglint to translate YANG to YIN formats.
+# Fixme: use xlstproc to extract the revision.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Change directory to the YANG modules' directory.
+cd "/home/admin/workspace/kea-2.4/build-tarball/kea/src/share/yang/modules"
+
+exit_code=0
+
+LIBYANG_PREFIX=''
+
+# Find yanglint.
+if test -f "${LIBYANG_PREFIX}/bin/yanglint"; then
+    yanglint="${LIBYANG_PREFIX}/bin/yanglint"
+    LD_LIBRARY_PATH="${LD_LIBRARY_PATH-}:${LIBYANG_PREFIX}/lib:${LIBYANG_PREFIX}/lib64"
+    export LD_LIBRARY_PATH
+elif command -v yanglint; then
+    yanglint='yanglint'
+else
+    exit_code=$((exit_code | 2))
+    printf 'ERROR: cannot find yanglint.\n' >&2
+    exit "${exit_code}"
+fi
+
+for m in *.yang; do
+    rev1=$("${yanglint}" -f yin "${m}" | grep '<revision date=' | head -1 | sed \
+ 's/.*<revision date="\([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\)".*/\1/')
+    rev2=$(echo "${m}" | sed \
+ 's/.*@\([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\)\..*/\1/')
+
+    if test "${rev1}" != "${rev2}"; then
+        exit_code=$((exit_code | 4))
+        printf 'ERROR: revision mismatch on module %s: revision date is %s, file name has %s.\n' "${m}" "${rev1}" "${rev2}" >&2
+    fi
+done
+
+exit "${exit_code}"
diff --git a/src/share/yang/modules/utils/check-revisions.sh.in b/src/share/yang/modules/utils/check-revisions.sh.in
new file mode 100644
index 0000000..5990100
--- /dev/null
+++ b/src/share/yang/modules/utils/check-revisions.sh.in
@@ -0,0 +1,52 @@
+#!/bin/sh
+
+# Copyright (C) 2018-2022 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Check revisions
+#
+# This developer script verifies versions in module contents match
+# the version in the name.
+# Requires yanglint to translate YANG to YIN formats.
+# Fixme: use xlstproc to extract the revision.
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Change directory to the YANG modules' directory.
+cd "@abs_top_srcdir@/src/share/yang/modules"
+
+exit_code=0
+
+LIBYANG_PREFIX='@LIBYANG_PREFIX@'
+
+# Find yanglint.
+if test -f "${LIBYANG_PREFIX}/bin/yanglint"; then
+    yanglint="${LIBYANG_PREFIX}/bin/yanglint"
+    LD_LIBRARY_PATH="${LD_LIBRARY_PATH-}:${LIBYANG_PREFIX}/lib:${LIBYANG_PREFIX}/lib64"
+    export LD_LIBRARY_PATH
+elif command -v yanglint; then
+    yanglint='yanglint'
+else
+    exit_code=$((exit_code | 2))
+    printf 'ERROR: cannot find yanglint.\n' >&2
+    exit "${exit_code}"
+fi
+
+for m in *.yang; do
+    rev1=$("${yanglint}" -f yin "${m}" | grep '<revision date=' | head -1 | sed \
+ 's/.*<revision date="\([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\)".*/\1/')
+    rev2=$(echo "${m}" | sed \
+ 's/.*@\([0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]\)\..*/\1/')
+
+    if test "${rev1}" != "${rev2}"; then
+        exit_code=$((exit_code | 4))
+        printf 'ERROR: revision mismatch on module %s: revision date is %s, file name has %s.\n' "${m}" "${rev1}" "${rev2}" >&2
+    fi
+done
+
+exit "${exit_code}"
diff --git a/src/share/yang/modules/utils/reinstall.sh.in b/src/share/yang/modules/utils/reinstall.sh.in
new file mode 100644
index 0000000..efb3627
--- /dev/null
+++ b/src/share/yang/modules/utils/reinstall.sh.in
@@ -0,0 +1,179 @@
+#!/bin/sh
+
+# Copyright (C) 2021-2022 Internet Systems Consortium, Inc. ("ISC")
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Usage:
+#
+# reinstall.sh [-d|--debug] [-h|--help] [-s|--sysrepo ${SYSREPO_INSTALLATION}]
+
+# Exit with error if commands exit with non-zero and if undefined variables are
+# used.
+set -eu
+
+# Print usage.
+# Expressions don't expand in single quotes, use double quotes for that. [SC2016]
+# shellcheck disable=SC2016
+print_usage() {
+  printf \
+'Usage: %s {{options}}
+Options:
+  [-d|--debug]                              enable debug mode, showing every executed command
+  [-h|--help]                               print usage (this text)
+  [-s|--sysrepo ${SYSREPO_INSTALLATION}]    point to sysrepo installation which is needed for sysrepoctl
+  [-u|--uninstall-first]                    uninstall before installing
+' \
+    "$(basename "${0}")"
+}
+
+# Define some ANSI color codes.
+if test -t 1; then
+  red='\033[91m'
+  reset='\033[0m'
+else
+  red=
+  reset=
+fi
+
+# Parse parameters.
+while test ${#} -gt 0; do
+  case "${1}" in
+    # [-d|--debug]                              enable debug mode, showing every executed command
+    '-d'|'--debug') set -vx ;;
+
+    # [-h|--help]                               print usage (this text)
+    '-h'|'--help') print_usage; exit 0 ;;
+
+    # [-s|--sysrepo ${SYSREPO_INSTALLATION}]    point to sysrepo installation which is needed for sysrepoctl
+    '-s'|'--sysrepo') shift; sysrepo=${1} ;;
+
+    # [-u|--uninstall-first]                    uninstall before installing
+    '-u'|'--uninstall-first') uninstall_first=true ;;
+
+    # Unrecognized argument
+    *)
+    printf "${red}ERROR: Unrecognized argument '%s'${reset}\\n" "${1}" 1>&2; print_usage; exit 1 ;;
+  esac; shift
+done
+
+SYSREPO_PREFIX='@SYSREPO_PREFIX@'
+
+# Default arguments
+if test -z "${sysrepo+x}"; then
+  if test -d "${SYSREPO_PREFIX}"; then
+    sysrepo="${SYSREPO_PREFIX}"
+    LD_LIBRARY_PATH="${LD_LIBRARY_PATH-}:${SYSREPO_PREFIX}/lib:${SYSREPO_PREFIX}/lib64"
+    export LD_LIBRARY_PATH
+  else
+    sysrepo='/usr/local'
+  fi
+fi
+test -z "${uninstall_first+x}" && uninstall_first='false'
+
+#------------------------------------------------------------------------------#
+
+# Get script path.
+script_path=$(cd "$(dirname "${0}")" && pwd)
+
+# shellcheck disable=SC2034
+# prefix appears unused. Verify use (or export if used externally).
+# reason: prefix is used in datarootdir (@datarootdir@) below.
+prefix="@prefix@"
+
+# Find modules location.
+# If script is in sources, use modules from sources.
+# If script is in installation, use modules from installation.
+for i in \
+  "@datarootdir@/@PACKAGE_NAME@/yang/modules" \
+  "@abs_top_builddir@/src/share/yang/modules" \
+; do
+  if test "${script_path}" = "${i}/utils"; then
+    modules="${i}"
+    break
+  fi
+done
+if test -z "${modules+x}"; then
+  printf 'ERROR: cannot find location of modules. Use this script from sources or from installation.' >&2
+  exit 1
+fi
+
+# sysrepoctl does not set its rpath. Set LD_LIBRARY_PATH instead.
+export LD_LIBRARY_PATH="${LD_LIBRARY_PATH-}:${sysrepo}/lib:${sysrepo}/lib64"
+
+# Check if module is installed.
+is_module_installed() {
+  module=${1}
+  if test "$("${sysrepo}/bin/sysrepoctl" -l | grep -F '| I' | cut -d ' ' -f 1 | tail -n +7 | head -n -1 | grep -Ec "^${module}")" -eq 0; then
+    # not installed
+    return 1
+  fi
+  # installed
+  return 0
+}
+
+# Install a module from the Kea sources. Should upgrade automatically to a newer
+# revision.
+install_kea_module() {
+  module=${1}
+
+  if is_module_installed "${module}"; then
+    # Upgrade.
+    flag="-U"
+  else
+    # Install.
+    flag="-i"
+  fi
+
+  # Find a module starting with given name and act on it.
+  find "${modules}" -maxdepth 1 -type f -name "${module}*.yang" -exec \
+    "${sysrepo}/bin/sysrepoctl" "${flag}" {} -s "${modules}" -v 4 \;
+}
+
+# Uninstall a module if installed.
+uninstall_module() {
+  module=${1}
+  if ! is_module_installed "${module}"; then
+    return;
+  fi
+  "${sysrepo}/bin/sysrepoctl" -u "${module}" -v 4
+}
+
+# Install all YANG modules in dependency order.
+install_yang_modules() {
+  install_kea_module 'keatest-module'
+  install_kea_module 'ietf-interfaces'
+  install_kea_module 'ietf-dhcpv6-common'
+  install_kea_module 'ietf-dhcpv6-client'
+  install_kea_module 'ietf-dhcpv6-relay'
+  install_kea_module 'ietf-dhcpv6-server'
+  install_kea_module 'ietf-yang-types'
+  install_kea_module 'ietf-dhcpv6-options'
+  install_kea_module 'ietf-dhcpv6-types'
+  install_kea_module 'ietf-inet-types'
+  install_kea_module 'kea-types'
+  install_kea_module 'kea-dhcp-types'
+  install_kea_module 'kea-dhcp-ddns'
+  install_kea_module 'kea-ctrl-agent'
+  install_kea_module 'kea-dhcp4-server'
+  install_kea_module 'kea-dhcp6-server'
+}
+
+# Uninstall all YANG modules in reverse dependency order. Only uninstalls Kea
+# modules. IETF modules might be dependencies to sysrepo internal modules.
+uninstall_yang_modules() {
+  uninstall_module 'kea-dhcp6-server'
+  uninstall_module 'kea-dhcp4-server'
+  uninstall_module 'kea-ctrl-agent'
+  uninstall_module 'kea-dhcp-ddns'
+  uninstall_module 'kea-dhcp-types'
+  uninstall_module 'kea-types'
+  uninstall_module 'keatest-module'
+}
+
+if "${uninstall_first}"; then
+  uninstall_yang_modules
+fi
+install_yang_modules