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+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";
+        }
+      }
+
+    }
+  }
+}