Adding upstream version 8.4.4.upstream/8.4.4upstream

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

1 files changed, 2139 insertions, 0 deletions

diff --git a/ospfd/ospf_ri.c b/ospfd/ospf_ri.c
new file mode 100644
index 0000000..e227a31
--- /dev/null
+++ b/ospfd/ospf_ri.c
@@ -0,0 +1,2139 @@
+/*
+ * This is an implementation of RFC4970 Router Information
+ * with support of RFC5088 PCE Capabilites announcement
+ *
+ * Module name: Router Information
+ * Author: Olivier Dugeon <olivier.dugeon@orange.com>
+ * Copyright (C) 2012 - 2017 Orange Labs http://www.orange.com/
+ *
+ * This file is part of GNU Quagga.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Quagga is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <zebra.h>
+#include <math.h>
+
+#include "linklist.h"
+#include "prefix.h"
+#include "if.h"
+#include "table.h"
+#include "memory.h"
+#include "command.h"
+#include "vty.h"
+#include "stream.h"
+#include "log.h"
+#include "thread.h"
+#include "hash.h"
+#include "sockunion.h" /* for inet_aton() */
+#include "mpls.h"
+
+#include "ospfd/ospfd.h"
+#include "ospfd/ospf_interface.h"
+#include "ospfd/ospf_ism.h"
+#include "ospfd/ospf_asbr.h"
+#include "ospfd/ospf_lsa.h"
+#include "ospfd/ospf_lsdb.h"
+#include "ospfd/ospf_neighbor.h"
+#include "ospfd/ospf_nsm.h"
+#include "ospfd/ospf_flood.h"
+#include "ospfd/ospf_packet.h"
+#include "ospfd/ospf_spf.h"
+#include "ospfd/ospf_dump.h"
+#include "ospfd/ospf_route.h"
+#include "ospfd/ospf_ase.h"
+#include "ospfd/ospf_zebra.h"
+#include "ospfd/ospf_sr.h"
+#include "ospfd/ospf_ri.h"
+#include "ospfd/ospf_errors.h"
+
+/*
+ * Global variable to manage Opaque-LSA/Router Information on this node.
+ * Note that all parameter values are stored in network byte order.
+ */
+static struct ospf_router_info OspfRI;
+
+/*------------------------------------------------------------------------------*
+ * Following are initialize/terminate functions for Router Information
+ *handling.
+ *------------------------------------------------------------------------------*/
+
+static void ospf_router_info_ism_change(struct ospf_interface *oi,
+					int old_status);
+static void ospf_router_info_config_write_router(struct vty *vty);
+static void ospf_router_info_show_info(struct vty *vty,
+				       struct json_object *json,
+				       struct ospf_lsa *lsa);
+static int ospf_router_info_lsa_originate(void *arg);
+static struct ospf_lsa *ospf_router_info_lsa_refresh(struct ospf_lsa *lsa);
+static void ospf_router_info_lsa_schedule(struct ospf_ri_area_info *ai,
+					  enum lsa_opcode opcode);
+static void ospf_router_info_register_vty(void);
+static int ospf_router_info_lsa_update(struct ospf_lsa *lsa);
+static void del_area_info(void *val);
+static void del_pce_info(void *val);
+
+int ospf_router_info_init(void)
+{
+
+	zlog_info("RI (%s): Initialize Router Information", __func__);
+
+	memset(&OspfRI, 0, sizeof(OspfRI));
+	OspfRI.enabled = false;
+	OspfRI.registered = 0;
+	OspfRI.scope = OSPF_OPAQUE_AS_LSA;
+	OspfRI.as_flags = RIFLG_LSA_INACTIVE;
+	OspfRI.area_info = list_new();
+	OspfRI.area_info->del = del_area_info;
+
+	/* Initialize pce domain and neighbor list */
+	OspfRI.pce_info.enabled = false;
+	OspfRI.pce_info.pce_domain = list_new();
+	OspfRI.pce_info.pce_domain->del = del_pce_info;
+	OspfRI.pce_info.pce_neighbor = list_new();
+	OspfRI.pce_info.pce_neighbor->del = del_pce_info;
+
+	/* Initialize Segment Routing information structure */
+	OspfRI.sr_info.enabled = false;
+
+	ospf_router_info_register_vty();
+
+	return 0;
+}
+
+static int ospf_router_info_register(uint8_t scope)
+{
+	int rc = 0;
+
+	if (OspfRI.registered)
+		return rc;
+
+	zlog_info("RI (%s): Register Router Information with scope %s(%d)",
+		  __func__,
+		  scope == OSPF_OPAQUE_AREA_LSA ? "Area" : "AS", scope);
+	rc = ospf_register_opaque_functab(
+		scope, OPAQUE_TYPE_ROUTER_INFORMATION_LSA,
+		NULL, /* new interface */
+		NULL, /* del interface */
+		ospf_router_info_ism_change,
+		NULL, /* NSM change */
+		ospf_router_info_config_write_router,
+		NULL, /* Config. write interface */
+		NULL, /* Config. write debug */
+		ospf_router_info_show_info, ospf_router_info_lsa_originate,
+		ospf_router_info_lsa_refresh, ospf_router_info_lsa_update,
+		NULL); /* del_lsa_hook */
+
+	if (rc != 0) {
+		flog_warn(
+			EC_OSPF_OPAQUE_REGISTRATION,
+			"RI (%s): Failed to register functions", __func__);
+		return rc;
+	}
+
+	OspfRI.registered = 1;
+	OspfRI.scope = scope;
+	return rc;
+}
+
+static int ospf_router_info_unregister(void)
+{
+
+	if ((OspfRI.scope != OSPF_OPAQUE_AS_LSA)
+	    && (OspfRI.scope != OSPF_OPAQUE_AREA_LSA)) {
+		assert("Unable to unregister Router Info functions: Wrong scope!"
+		       == NULL);
+		return -1;
+	}
+
+	ospf_delete_opaque_functab(OspfRI.scope,
+				   OPAQUE_TYPE_ROUTER_INFORMATION_LSA);
+
+	OspfRI.registered = 0;
+	return 0;
+}
+
+void ospf_router_info_term(void)
+{
+
+	list_delete(&OspfRI.pce_info.pce_domain);
+	list_delete(&OspfRI.pce_info.pce_neighbor);
+
+	OspfRI.enabled = false;
+
+	ospf_router_info_unregister();
+
+	return;
+}
+
+void ospf_router_info_finish(void)
+{
+	struct listnode *node, *nnode;
+	struct ospf_ri_area_info *ai;
+
+	/* Flush Router Info LSA */
+	for (ALL_LIST_ELEMENTS(OspfRI.area_info, node, nnode, ai))
+		if (CHECK_FLAG(ai->flags, RIFLG_LSA_ENGAGED))
+			ospf_router_info_lsa_schedule(ai, FLUSH_THIS_LSA);
+
+	list_delete_all_node(OspfRI.pce_info.pce_domain);
+	list_delete_all_node(OspfRI.pce_info.pce_neighbor);
+
+	OspfRI.enabled = false;
+}
+
+static void del_area_info(void *val)
+{
+	XFREE(MTYPE_OSPF_ROUTER_INFO, val);
+}
+
+static void del_pce_info(void *val)
+{
+	XFREE(MTYPE_OSPF_PCE_PARAMS, val);
+}
+
+/* Catch RI LSA flooding Scope for ospf_ext.[h,c] code */
+struct scope_info ospf_router_info_get_flooding_scope(void)
+{
+	struct scope_info flooding_scope;
+
+	if (OspfRI.scope == OSPF_OPAQUE_AS_LSA) {
+		flooding_scope.scope = OSPF_OPAQUE_AS_LSA;
+		flooding_scope.areas = NULL;
+		return flooding_scope;
+	}
+	flooding_scope.scope = OSPF_OPAQUE_AREA_LSA;
+	flooding_scope.areas = OspfRI.area_info;
+	return flooding_scope;
+}
+
+static struct ospf_ri_area_info *lookup_by_area(struct ospf_area *area)
+{
+	struct listnode *node, *nnode;
+	struct ospf_ri_area_info *ai;
+
+	for (ALL_LIST_ELEMENTS(OspfRI.area_info, node, nnode, ai))
+		if (ai->area == area)
+			return ai;
+
+	return NULL;
+}
+
+/*------------------------------------------------------------------------*
+ * Following are control functions for ROUTER INFORMATION parameters
+ *management.
+ *------------------------------------------------------------------------*/
+
+static void set_router_info_capabilities(struct ri_tlv_router_cap *ric,
+					 uint32_t cap)
+{
+	ric->header.type = htons(RI_TLV_CAPABILITIES);
+	ric->header.length = htons(RI_TLV_LENGTH);
+	ric->value = htonl(cap);
+	return;
+}
+
+static int set_pce_header(struct ospf_pce_info *pce)
+{
+	uint16_t length = 0;
+	struct listnode *node;
+	struct ri_pce_subtlv_domain *domain;
+	struct ri_pce_subtlv_neighbor *neighbor;
+
+	/* PCE Address */
+	if (ntohs(pce->pce_address.header.type) != 0)
+		length += TLV_SIZE(&pce->pce_address.header);
+
+	/* PCE Path Scope */
+	if (ntohs(pce->pce_scope.header.type) != 0)
+		length += TLV_SIZE(&pce->pce_scope.header);
+
+	/* PCE Domain */
+	for (ALL_LIST_ELEMENTS_RO(pce->pce_domain, node, domain)) {
+		if (ntohs(domain->header.type) != 0)
+			length += TLV_SIZE(&domain->header);
+	}
+
+	/* PCE Neighbor */
+	for (ALL_LIST_ELEMENTS_RO(pce->pce_neighbor, node, neighbor)) {
+		if (ntohs(neighbor->header.type) != 0)
+			length += TLV_SIZE(&neighbor->header);
+	}
+
+	/* PCE Capabilities */
+	if (ntohs(pce->pce_cap_flag.header.type) != 0)
+		length += TLV_SIZE(&pce->pce_cap_flag.header);
+
+	if (length != 0) {
+		pce->pce_header.header.type = htons(RI_TLV_PCE);
+		pce->pce_header.header.length = htons(length);
+		pce->enabled = true;
+	} else {
+		pce->pce_header.header.type = 0;
+		pce->pce_header.header.length = 0;
+		pce->enabled = false;
+	}
+
+	return length;
+}
+
+static void set_pce_address(struct in_addr ipv4, struct ospf_pce_info *pce)
+{
+
+	/* Enable PCE Info */
+	pce->pce_header.header.type = htons(RI_TLV_PCE);
+	/* Set PCE Address */
+	pce->pce_address.header.type = htons(RI_PCE_SUBTLV_ADDRESS);
+	pce->pce_address.header.length = htons(PCE_ADDRESS_IPV4_SIZE);
+	pce->pce_address.address.type = htons(PCE_ADDRESS_IPV4);
+	pce->pce_address.address.value = ipv4;
+
+	return;
+}
+
+static void set_pce_path_scope(uint32_t scope, struct ospf_pce_info *pce)
+{
+
+	/* Set PCE Scope */
+	pce->pce_scope.header.type = htons(RI_PCE_SUBTLV_PATH_SCOPE);
+	pce->pce_scope.header.length = htons(RI_TLV_LENGTH);
+	pce->pce_scope.value = htonl(scope);
+
+	return;
+}
+
+static void set_pce_domain(uint16_t type, uint32_t domain,
+			   struct ospf_pce_info *pce)
+{
+
+	struct ri_pce_subtlv_domain *new;
+
+	/* Create new domain info */
+	new = XCALLOC(MTYPE_OSPF_PCE_PARAMS,
+		      sizeof(struct ri_pce_subtlv_domain));
+
+	new->header.type = htons(RI_PCE_SUBTLV_DOMAIN);
+	new->header.length = htons(PCE_ADDRESS_IPV4_SIZE);
+	new->type = htons(type);
+	new->value = htonl(domain);
+
+	/* Add new domain to the list */
+	listnode_add(pce->pce_domain, new);
+
+	return;
+}
+
+static void unset_pce_domain(uint16_t type, uint32_t domain,
+			     struct ospf_pce_info *pce)
+{
+	struct listnode *node;
+	struct ri_pce_subtlv_domain *old = NULL;
+	int found = 0;
+
+	/* Search the corresponding node */
+	for (ALL_LIST_ELEMENTS_RO(pce->pce_domain, node, old)) {
+		if ((old->type == htons(type))
+		    && (old->value == htonl(domain))) {
+			found = 1;
+			break;
+		}
+	}
+
+	/* if found remove it */
+	if (found) {
+		listnode_delete(pce->pce_domain, old);
+
+		/* Finally free the old domain */
+		XFREE(MTYPE_OSPF_PCE_PARAMS, old);
+	}
+}
+
+static void set_pce_neighbor(uint16_t type, uint32_t domain,
+			     struct ospf_pce_info *pce)
+{
+
+	struct ri_pce_subtlv_neighbor *new;
+
+	/* Create new neighbor info */
+	new = XCALLOC(MTYPE_OSPF_PCE_PARAMS,
+		      sizeof(struct ri_pce_subtlv_neighbor));
+
+	new->header.type = htons(RI_PCE_SUBTLV_NEIGHBOR);
+	new->header.length = htons(PCE_ADDRESS_IPV4_SIZE);
+	new->type = htons(type);
+	new->value = htonl(domain);
+
+	/* Add new domain to the list */
+	listnode_add(pce->pce_neighbor, new);
+
+	return;
+}
+
+static void unset_pce_neighbor(uint16_t type, uint32_t domain,
+			       struct ospf_pce_info *pce)
+{
+	struct listnode *node;
+	struct ri_pce_subtlv_neighbor *old = NULL;
+	int found = 0;
+
+	/* Search the corresponding node */
+	for (ALL_LIST_ELEMENTS_RO(pce->pce_neighbor, node, old)) {
+		if ((old->type == htons(type))
+		    && (old->value == htonl(domain))) {
+			found = 1;
+			break;
+		}
+	}
+
+	/* if found remove it */
+	if (found) {
+		listnode_delete(pce->pce_neighbor, old);
+
+		/* Finally free the old domain */
+		XFREE(MTYPE_OSPF_PCE_PARAMS, old);
+	}
+}
+
+static void set_pce_cap_flag(uint32_t cap, struct ospf_pce_info *pce)
+{
+
+	/* Set PCE Capabilities flag */
+	pce->pce_cap_flag.header.type = htons(RI_PCE_SUBTLV_CAP_FLAG);
+	pce->pce_cap_flag.header.length = htons(RI_TLV_LENGTH);
+	pce->pce_cap_flag.value = htonl(cap);
+
+	return;
+}
+
+/* Segment Routing TLV setter */
+
+/* Algorithm SubTLV - section 3.1 */
+static void set_sr_algorithm(uint8_t algo)
+{
+
+	OspfRI.sr_info.algo.value[0] = algo;
+	for (int i = 1; i < ALGORITHM_COUNT; i++)
+		OspfRI.sr_info.algo.value[i] = SR_ALGORITHM_UNSET;
+
+	/* Set TLV type and length == only 1 Algorithm */
+	TLV_TYPE(OspfRI.sr_info.algo) = htons(RI_SR_TLV_SR_ALGORITHM);
+	TLV_LEN(OspfRI.sr_info.algo) = htons(sizeof(uint8_t));
+}
+
+/* unset Aglogithm SubTLV */
+static void unset_sr_algorithm(uint8_t algo)
+{
+
+	for (int i = 0; i < ALGORITHM_COUNT; i++)
+		OspfRI.sr_info.algo.value[i] = SR_ALGORITHM_UNSET;
+
+	/* Unset TLV type and length */
+	TLV_TYPE(OspfRI.sr_info.algo) = htons(0);
+	TLV_LEN(OspfRI.sr_info.algo) = htons(0);
+}
+
+/* Set Segment Routing Global Block SubTLV - section 3.2 */
+static void set_sr_global_label_range(struct sr_block srgb)
+{
+	/* Set Header */
+	TLV_TYPE(OspfRI.sr_info.srgb) = htons(RI_SR_TLV_SRGB_LABEL_RANGE);
+	TLV_LEN(OspfRI.sr_info.srgb) = htons(RI_SR_TLV_LABEL_RANGE_SIZE);
+	/* Set Range Size */
+	OspfRI.sr_info.srgb.size = htonl(SET_RANGE_SIZE(srgb.range_size));
+	/* Set Lower bound label SubTLV */
+	TLV_TYPE(OspfRI.sr_info.srgb.lower) = htons(SUBTLV_SID_LABEL);
+	TLV_LEN(OspfRI.sr_info.srgb.lower) = htons(SID_RANGE_LABEL_LENGTH);
+	OspfRI.sr_info.srgb.lower.value = htonl(SET_LABEL(srgb.lower_bound));
+}
+
+/* Unset Segment Routing Global Block SubTLV */
+static void unset_sr_global_label_range(void)
+{
+	TLV_TYPE(OspfRI.sr_info.srgb) = htons(0);
+	TLV_LEN(OspfRI.sr_info.srgb) = htons(0);
+	TLV_TYPE(OspfRI.sr_info.srgb.lower) = htons(0);
+	TLV_LEN(OspfRI.sr_info.srgb.lower) = htons(0);
+}
+
+/* Set Segment Routing Local Block SubTLV - section 3.2 */
+static void set_sr_local_label_range(struct sr_block srlb)
+{
+	/* Set Header */
+	TLV_TYPE(OspfRI.sr_info.srlb) = htons(RI_SR_TLV_SRLB_LABEL_RANGE);
+	TLV_LEN(OspfRI.sr_info.srlb) = htons(RI_SR_TLV_LABEL_RANGE_SIZE);
+	/* Set Range Size */
+	OspfRI.sr_info.srlb.size = htonl(SET_RANGE_SIZE(srlb.range_size));
+	/* Set Lower bound label SubTLV */
+	TLV_TYPE(OspfRI.sr_info.srlb.lower) = htons(SUBTLV_SID_LABEL);
+	TLV_LEN(OspfRI.sr_info.srlb.lower) = htons(SID_RANGE_LABEL_LENGTH);
+	OspfRI.sr_info.srlb.lower.value = htonl(SET_LABEL(srlb.lower_bound));
+}
+
+/* Unset Segment Routing Local Block SubTLV */
+static void unset_sr_local_label_range(void)
+{
+	TLV_TYPE(OspfRI.sr_info.srlb) = htons(0);
+	TLV_LEN(OspfRI.sr_info.srlb) = htons(0);
+	TLV_TYPE(OspfRI.sr_info.srlb.lower) = htons(0);
+	TLV_LEN(OspfRI.sr_info.srlb.lower) = htons(0);
+}
+
+/* Set Maximum Stack Depth for this router */
+static void set_sr_node_msd(uint8_t msd)
+{
+	TLV_TYPE(OspfRI.sr_info.msd) = htons(RI_SR_TLV_NODE_MSD);
+	TLV_LEN(OspfRI.sr_info.msd) = htons(sizeof(uint32_t));
+	OspfRI.sr_info.msd.value = msd;
+}
+
+/* Unset this router MSD */
+static void unset_sr_node_msd(void)
+{
+	TLV_TYPE(OspfRI.sr_info.msd) = htons(0);
+	TLV_LEN(OspfRI.sr_info.msd) = htons(0);
+}
+
+static void unset_param(void *tlv_buffer)
+{
+	struct tlv_header *tlv = (struct tlv_header *)tlv_buffer;
+
+	tlv->type = 0;
+	/* Fill the Value to 0 */
+	memset(TLV_DATA(tlv_buffer), 0, TLV_BODY_SIZE(tlv));
+	tlv->length = 0;
+
+	return;
+}
+
+static void initialize_params(struct ospf_router_info *ori)
+{
+	uint32_t cap = 0;
+	struct ospf *top;
+	struct listnode *node, *nnode;
+	struct ospf_area *area;
+	struct ospf_ri_area_info *new;
+
+	/*
+	 * Initialize default Router Information Capabilities.
+	 */
+	cap = RI_TE_SUPPORT;
+
+	set_router_info_capabilities(&ori->router_cap, cap);
+
+	/* If Area address is not null and exist, retrieve corresponding
+	 * structure */
+	top = ospf_lookup_by_vrf_id(VRF_DEFAULT);
+	zlog_info("RI (%s): Initialize Router Info for %s scope", __func__,
+		  OspfRI.scope == OSPF_OPAQUE_AREA_LSA ? "Area" : "AS");
+
+	/* Try to get available Area's context from ospf at this step.
+	 * Do it latter if not available */
+	if (OspfRI.scope == OSPF_OPAQUE_AREA_LSA) {
+		if (!list_isempty(OspfRI.area_info))
+			list_delete_all_node(OspfRI.area_info);
+		for (ALL_LIST_ELEMENTS(top->areas, node, nnode, area)) {
+			zlog_debug("RI (%s): Add area %pI4 to Router Information",
+				__func__, &area->area_id);
+			new = XCALLOC(MTYPE_OSPF_ROUTER_INFO,
+				sizeof(struct ospf_ri_area_info));
+			new->area = area;
+			new->flags = RIFLG_LSA_INACTIVE;
+			listnode_add(OspfRI.area_info, new);
+		}
+	}
+
+	/*
+	 * Initialize default PCE Information values
+	 */
+	/* PCE address == OSPF Router ID */
+	set_pce_address(top->router_id, &ori->pce_info);
+
+	/* PCE scope */
+	cap = 7; /* Set L, R and Rd bits to one = intra & inter-area path
+		    computation */
+	set_pce_path_scope(cap, &ori->pce_info);
+
+	/* PCE Capabilities */
+	cap = PCE_CAP_BIDIRECTIONAL | PCE_CAP_DIVERSE_PATH | PCE_CAP_OBJECTIVES
+	      | PCE_CAP_ADDITIVE | PCE_CAP_MULTIPLE_REQ;
+	set_pce_cap_flag(cap, &ori->pce_info);
+
+	return;
+}
+
+static int is_mandated_params_set(struct ospf_router_info *ori)
+{
+	int rc = 0;
+
+	if (ori == NULL)
+		return rc;
+
+	if (ntohs(ori->router_cap.header.type) == 0)
+		return rc;
+
+	if ((ntohs(ori->pce_info.pce_header.header.type) == RI_TLV_PCE)
+	    && (ntohs(ori->pce_info.pce_address.header.type) == 0)
+	    && (ntohs(ori->pce_info.pce_cap_flag.header.type) == 0))
+		return rc;
+
+	if ((ori->sr_info.enabled) && (ntohs(TLV_TYPE(ori->sr_info.algo)) == 0)
+	    && (ntohs(TLV_TYPE(ori->sr_info.srgb)) == 0))
+		return rc;
+
+	rc = 1;
+
+	return rc;
+}
+
+/*
+ * Used by Segment Routing to set new TLVs and Sub-TLVs values
+ *
+ * @param enable To activate or not Segment Routing router Information flooding
+ * @param srn    Self Segment Routing node
+ *
+ * @return none
+ */
+void ospf_router_info_update_sr(bool enable, struct sr_node *srn)
+{
+	struct listnode *node, *nnode;
+	struct ospf_ri_area_info *ai;
+
+	/* First, check if Router Information is registered or not */
+	if (!OspfRI.registered)
+		ospf_router_info_register(OSPF_OPAQUE_AREA_LSA);
+
+	/* Verify that scope is AREA */
+	if (OspfRI.scope != OSPF_OPAQUE_AREA_LSA) {
+		zlog_err(
+			"RI (%s): Router Info is %s flooding: Change scope to Area flooding for Segment Routing",
+			__func__,
+			OspfRI.scope == OSPF_OPAQUE_AREA_LSA ? "Area" : "AS");
+		return;
+	}
+
+	/* Then, activate and initialize Router Information if necessary */
+	if (!OspfRI.enabled) {
+		OspfRI.enabled = true;
+		initialize_params(&OspfRI);
+	}
+
+	/* Check that SR node is valid */
+	if (srn == NULL)
+		return;
+
+	if (IS_DEBUG_OSPF_SR)
+		zlog_debug("RI (%s): %s Routing Information for Segment Routing",
+			   __func__, enable ? "Enable" : "Disable");
+
+	/* Unset or Set SR parameters */
+	if (!enable) {
+		unset_sr_algorithm(SR_ALGORITHM_SPF);
+		unset_sr_global_label_range();
+		unset_sr_local_label_range();
+		unset_sr_node_msd();
+		OspfRI.sr_info.enabled = false;
+	} else {
+		// Only SR_ALGORITHM_SPF is supported
+		set_sr_algorithm(SR_ALGORITHM_SPF);
+		set_sr_global_label_range(srn->srgb);
+		set_sr_local_label_range(srn->srlb);
+		if (srn->msd != 0)
+			set_sr_node_msd(srn->msd);
+		else
+			unset_sr_node_msd();
+		OspfRI.sr_info.enabled = true;
+	}
+
+	/* Refresh if already engaged or originate RI LSA */
+	for (ALL_LIST_ELEMENTS(OspfRI.area_info, node, nnode, ai)) {
+		if (CHECK_FLAG(ai->flags, RIFLG_LSA_ENGAGED))
+			ospf_router_info_lsa_schedule(ai, REFRESH_THIS_LSA);
+		else
+			ospf_router_info_lsa_schedule(ai,
+				REORIGINATE_THIS_LSA);
+
+	}
+}
+
+/*------------------------------------------------------------------------*
+ * Following are callback functions against generic Opaque-LSAs handling.
+ *------------------------------------------------------------------------*/
+static void ospf_router_info_ism_change(struct ospf_interface *oi,
+					int old_state)
+{
+
+	struct ospf_ri_area_info *ai;
+
+	/* Collect area information */
+	ai = lookup_by_area(oi->area);
+
+	/* Check if area is not yet registered */
+	if (ai != NULL)
+		return;
+
+	/* Add this new area to the list */
+	ai = XCALLOC(MTYPE_OSPF_ROUTER_INFO, sizeof(struct ospf_ri_area_info));
+	ai->area = oi->area;
+	ai->flags = RIFLG_LSA_INACTIVE;
+	listnode_add(OspfRI.area_info, ai);
+
+	return;
+}
+
+/*------------------------------------------------------------------------*
+ * Following are OSPF protocol processing functions for ROUTER INFORMATION
+ *------------------------------------------------------------------------*/
+
+static void build_tlv_header(struct stream *s, struct tlv_header *tlvh)
+{
+
+	stream_put(s, tlvh, sizeof(struct tlv_header));
+	return;
+}
+
+static void build_tlv(struct stream *s, struct tlv_header *tlvh)
+{
+
+	if (ntohs(tlvh->type) != 0) {
+		build_tlv_header(s, tlvh);
+		stream_put(s, TLV_DATA(tlvh), TLV_BODY_SIZE(tlvh));
+	}
+	return;
+}
+
+static void ospf_router_info_lsa_body_set(struct stream *s)
+{
+
+	struct listnode *node;
+	struct ri_pce_subtlv_domain *domain;
+	struct ri_pce_subtlv_neighbor *neighbor;
+
+	/* Build Router Information TLV */
+	build_tlv(s, &OspfRI.router_cap.header);
+
+	/* Build Segment Routing TLVs if enabled */
+	if (OspfRI.sr_info.enabled) {
+		/* Build Algorithm TLV */
+		build_tlv(s, &TLV_HDR(OspfRI.sr_info.algo));
+		/* Build SRGB TLV */
+		build_tlv(s, &TLV_HDR(OspfRI.sr_info.srgb));
+		/* Build SRLB TLV */
+		build_tlv(s, &TLV_HDR(OspfRI.sr_info.srlb));
+		/* Build MSD TLV */
+		build_tlv(s, &TLV_HDR(OspfRI.sr_info.msd));
+	}
+
+	/* Add RI PCE TLV if it is set */
+	if (OspfRI.pce_info.enabled) {
+
+		/* Compute PCE Info header first */
+		set_pce_header(&OspfRI.pce_info);
+
+		/* Build PCE TLV */
+		build_tlv_header(s, &OspfRI.pce_info.pce_header.header);
+
+		/* Build PCE address sub-tlv */
+		build_tlv(s, &OspfRI.pce_info.pce_address.header);
+
+		/* Build PCE path scope sub-tlv */
+		build_tlv(s, &OspfRI.pce_info.pce_scope.header);
+
+		/* Build PCE domain sub-tlv */
+		for (ALL_LIST_ELEMENTS_RO(OspfRI.pce_info.pce_domain, node,
+					  domain))
+			build_tlv(s, &domain->header);
+
+		/* Build PCE neighbor sub-tlv */
+		for (ALL_LIST_ELEMENTS_RO(OspfRI.pce_info.pce_neighbor, node,
+					  neighbor))
+			build_tlv(s, &neighbor->header);
+
+		/* Build PCE cap flag sub-tlv */
+		build_tlv(s, &OspfRI.pce_info.pce_cap_flag.header);
+	}
+
+	return;
+}
+
+/* Create new opaque-LSA. */
+static struct ospf_lsa *ospf_router_info_lsa_new(struct ospf_area *area)
+{
+	struct ospf *top;
+	struct stream *s;
+	struct lsa_header *lsah;
+	struct ospf_lsa *new = NULL;
+	uint8_t options, lsa_type;
+	struct in_addr lsa_id;
+	uint32_t tmp;
+	uint16_t length;
+
+	/* Create a stream for LSA. */
+	s = stream_new(OSPF_MAX_LSA_SIZE);
+
+	lsah = (struct lsa_header *)STREAM_DATA(s);
+
+	options = OSPF_OPTION_E;  /* Enable AS external as we flood RI with
+				     Opaque Type 11 */
+	options |= OSPF_OPTION_O; /* Don't forget this :-) */
+
+	lsa_type = OspfRI.scope;
+	/* LSA ID == 0 for Router Information see RFC 4970 */
+	tmp = SET_OPAQUE_LSID(OPAQUE_TYPE_ROUTER_INFORMATION_LSA, 0);
+	lsa_id.s_addr = htonl(tmp);
+
+	if (IS_DEBUG_OSPF(lsa, LSA_GENERATE))
+		zlog_debug(
+			"LSA[Type%d:%pI4]: Create an Opaque-LSA/ROUTER INFORMATION instance",
+			lsa_type, &lsa_id);
+
+	top = ospf_lookup_by_vrf_id(VRF_DEFAULT);
+
+	/* Set opaque-LSA header fields. */
+	lsa_header_set(s, options, lsa_type, lsa_id, top->router_id);
+
+	/* Set opaque-LSA body fields. */
+	ospf_router_info_lsa_body_set(s);
+
+	/* Set length. */
+	length = stream_get_endp(s);
+	lsah->length = htons(length);
+
+	/* Now, create an OSPF LSA instance. */
+	new = ospf_lsa_new_and_data(length);
+
+	new->area = area;
+
+	if (new->area && new->area->ospf)
+		new->vrf_id = new->area->ospf->vrf_id;
+	else
+		new->vrf_id = VRF_DEFAULT;
+
+	SET_FLAG(new->flags, OSPF_LSA_SELF);
+	memcpy(new->data, lsah, length);
+	stream_free(s);
+
+	return new;
+}
+
+static int ospf_router_info_lsa_originate_as(void *arg)
+{
+	struct ospf_lsa *new;
+	struct ospf *top;
+	int rc = -1;
+	vrf_id_t vrf_id = VRF_DEFAULT;
+
+	/* Sanity Check */
+	if (OspfRI.scope == OSPF_OPAQUE_AREA_LSA) {
+		flog_warn(
+			EC_OSPF_LSA_INSTALL_FAILURE,
+			"RI (%s): wrong flooding scope AREA instead of AS ?",
+			__func__);
+		return rc;
+	}
+
+	/* Create new Opaque-LSA/ROUTER INFORMATION instance. */
+	new = ospf_router_info_lsa_new(NULL);
+	new->vrf_id = VRF_DEFAULT;
+	top = (struct ospf *)arg;
+
+	/* Check ospf info */
+	if (top == NULL) {
+		zlog_debug("RI (%s): ospf instance not found for vrf id %u",
+			   __func__, vrf_id);
+		ospf_lsa_unlock(&new);
+		return rc;
+	}
+
+	/* Install this LSA into LSDB. */
+	if (ospf_lsa_install(top, NULL /*oi */, new) == NULL) {
+		flog_warn(
+			EC_OSPF_LSA_INSTALL_FAILURE,
+			"RI (%s): ospf_lsa_install() ?", __func__);
+		ospf_lsa_unlock(&new);
+		return rc;
+	}
+
+	/* Update new LSA origination count. */
+	top->lsa_originate_count++;
+
+	/* Flood new LSA through AREA or AS. */
+	SET_FLAG(OspfRI.as_flags, RIFLG_LSA_ENGAGED);
+	ospf_flood_through_as(top, NULL /*nbr */, new);
+
+	if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) {
+		zlog_debug(
+			"LSA[Type%d:%pI4]: Originate Opaque-LSA/ROUTER INFORMATION",
+			new->data->type, &new->data->id);
+		ospf_lsa_header_dump(new->data);
+	}
+
+	rc = 0;
+	return rc;
+}
+
+static int ospf_router_info_lsa_originate_area(void *arg)
+{
+	struct ospf_lsa *new;
+	struct ospf *top;
+	struct ospf_ri_area_info *ai = NULL;
+	int rc = -1;
+	vrf_id_t vrf_id = VRF_DEFAULT;
+
+	/* Sanity Check */
+	if (OspfRI.scope == OSPF_OPAQUE_AS_LSA) {
+		flog_warn(
+			EC_OSPF_LSA_INSTALL_FAILURE,
+			"RI (%s): wrong flooding scope AS instead of AREA ?",
+			__func__);
+		return rc;
+	}
+
+	/* Create new Opaque-LSA/ROUTER INFORMATION instance. */
+	ai = lookup_by_area((struct ospf_area *)arg);
+	if (ai == NULL) {
+		zlog_debug(
+			"RI (%s): There is no context for this Router Information. Stop processing",
+			__func__);
+		return rc;
+	}
+	if (ai->area->ospf) {
+		vrf_id = ai->area->ospf->vrf_id;
+		top = ai->area->ospf;
+	} else {
+		top = ospf_lookup_by_vrf_id(vrf_id);
+	}
+	new = ospf_router_info_lsa_new(ai->area);
+	new->vrf_id = vrf_id;
+
+	/* Check ospf info */
+	if (top == NULL) {
+		zlog_debug("RI (%s): ospf instance not found for vrf id %u",
+			   __func__, vrf_id);
+		ospf_lsa_unlock(&new);
+		return rc;
+	}
+
+	/* Install this LSA into LSDB. */
+	if (ospf_lsa_install(top, NULL /*oi */, new) == NULL) {
+		flog_warn(
+			EC_OSPF_LSA_INSTALL_FAILURE,
+			"RI (%s): ospf_lsa_install() ?", __func__);
+		ospf_lsa_unlock(&new);
+		return rc;
+	}
+
+	/* Update new LSA origination count. */
+	top->lsa_originate_count++;
+
+	/* Flood new LSA through AREA or AS. */
+	SET_FLAG(ai->flags, RIFLG_LSA_ENGAGED);
+	ospf_flood_through_area(ai->area, NULL /*nbr */, new);
+
+	if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) {
+		zlog_debug(
+			"LSA[Type%d:%pI4]: Originate Opaque-LSA/ROUTER INFORMATION",
+			new->data->type, &new->data->id);
+		ospf_lsa_header_dump(new->data);
+	}
+
+	rc = 0;
+	return rc;
+}
+
+static int ospf_router_info_lsa_originate(void *arg)
+{
+
+	struct ospf_ri_area_info *ai;
+	int rc = -1;
+
+	if (!OspfRI.enabled) {
+		zlog_info("RI (%s): ROUTER INFORMATION is disabled now.",
+			  __func__);
+		rc = 0; /* This is not an error case. */
+		return rc;
+	}
+
+	/* Check if Router Information LSA is already engaged */
+	if (OspfRI.scope == OSPF_OPAQUE_AS_LSA) {
+		if ((CHECK_FLAG(OspfRI.as_flags, RIFLG_LSA_ENGAGED))
+			&& (CHECK_FLAG(OspfRI.as_flags,
+				RIFLG_LSA_FORCED_REFRESH))) {
+			UNSET_FLAG(OspfRI.as_flags, RIFLG_LSA_FORCED_REFRESH);
+			ospf_router_info_lsa_schedule(NULL, REFRESH_THIS_LSA);
+			rc = 0;
+			return rc;
+		}
+	} else {
+		ai = lookup_by_area((struct ospf_area *)arg);
+		if (ai == NULL) {
+			flog_warn(
+				EC_OSPF_LSA,
+				"RI (%s): Missing area information", __func__);
+			return rc;
+		}
+		if ((CHECK_FLAG(ai->flags, RIFLG_LSA_ENGAGED))
+			&& (CHECK_FLAG(ai->flags, RIFLG_LSA_FORCED_REFRESH))) {
+			UNSET_FLAG(ai->flags, RIFLG_LSA_FORCED_REFRESH);
+			ospf_router_info_lsa_schedule(ai, REFRESH_THIS_LSA);
+			rc = 0;
+			return rc;
+		}
+	}
+
+	/* Router Information is not yet Engaged, check parameters */
+	if (!is_mandated_params_set(&OspfRI))
+		flog_warn(
+			EC_OSPF_LSA,
+			"RI (%s): lacks mandated ROUTER INFORMATION parameters",
+			__func__);
+
+	/* Ok, let's try to originate an LSA */
+	if (OspfRI.scope == OSPF_OPAQUE_AS_LSA)
+		rc = ospf_router_info_lsa_originate_as(arg);
+	else
+		rc = ospf_router_info_lsa_originate_area(arg);
+
+	return rc;
+}
+
+static struct ospf_lsa *ospf_router_info_lsa_refresh(struct ospf_lsa *lsa)
+{
+	struct ospf_ri_area_info *ai = NULL;
+	struct ospf_lsa *new = NULL;
+	struct ospf *top;
+
+	if (!OspfRI.enabled) {
+		/*
+		 * This LSA must have flushed before due to ROUTER INFORMATION
+		 * status change.
+		 * It seems a slip among routers in the routing domain.
+		 */
+		zlog_info("RI (%s): ROUTER INFORMATION is disabled now.",
+			  __func__);
+		lsa->data->ls_age =
+			htons(OSPF_LSA_MAXAGE); /* Flush it anyway. */
+	}
+
+	/* Verify that the Router Information ID is supported */
+	if (GET_OPAQUE_ID(ntohl(lsa->data->id.s_addr)) != 0) {
+		flog_warn(
+			EC_OSPF_LSA,
+			"RI (%s): Unsupported Router Information ID",
+			__func__);
+		return NULL;
+	}
+
+	/* Process LSA depending of the flooding scope */
+	if (OspfRI.scope == OSPF_OPAQUE_AREA_LSA) {
+		/* Get context AREA context */
+		ai = lookup_by_area(lsa->area);
+		if (ai == NULL) {
+			flog_warn(
+				EC_OSPF_LSA,
+				"RI (%s): No associated Area", __func__);
+			return NULL;
+		}
+		/* Flush LSA, if the lsa's age reached to MaxAge. */
+		if (IS_LSA_MAXAGE(lsa)) {
+			UNSET_FLAG(ai->flags, RIFLG_LSA_ENGAGED);
+			ospf_opaque_lsa_flush_schedule(lsa);
+			return NULL;
+		}
+		/* Create new Opaque-LSA/ROUTER INFORMATION instance. */
+		new = ospf_router_info_lsa_new(ai->area);
+		new->data->ls_seqnum = lsa_seqnum_increment(lsa);
+		new->vrf_id = lsa->vrf_id;
+		/* Install this LSA into LSDB. */
+		/* Given "lsa" will be freed in the next function. */
+		top = ospf_lookup_by_vrf_id(lsa->vrf_id);
+		if (ospf_lsa_install(top, NULL /*oi */, new) == NULL) {
+			flog_warn(EC_OSPF_LSA_INSTALL_FAILURE,
+				  "RI (%s): ospf_lsa_install() ?", __func__);
+			ospf_lsa_unlock(&new);
+			return new;
+		}
+		/* Flood updated LSA through AREA */
+		ospf_flood_through_area(ai->area, NULL /*nbr */, new);
+
+	} else { /* AS Flooding scope */
+		/* Flush LSA, if the lsa's age reached to MaxAge. */
+		if (IS_LSA_MAXAGE(lsa)) {
+			UNSET_FLAG(OspfRI.as_flags, RIFLG_LSA_ENGAGED);
+			ospf_opaque_lsa_flush_schedule(lsa);
+			return NULL;
+		}
+		/* Create new Opaque-LSA/ROUTER INFORMATION instance. */
+		new = ospf_router_info_lsa_new(NULL);
+		new->data->ls_seqnum = lsa_seqnum_increment(lsa);
+		new->vrf_id = lsa->vrf_id;
+		/* Install this LSA into LSDB. */
+		/* Given "lsa" will be freed in the next function. */
+		top = ospf_lookup_by_vrf_id(lsa->vrf_id);
+		if (ospf_lsa_install(top, NULL /*oi */, new) == NULL) {
+			flog_warn(EC_OSPF_LSA_INSTALL_FAILURE,
+				  "RI (%s): ospf_lsa_install() ?", __func__);
+			ospf_lsa_unlock(&new);
+			return new;
+		}
+		/* Flood updated LSA through AS */
+		ospf_flood_through_as(top, NULL /*nbr */, new);
+	}
+
+	/* Debug logging. */
+	if (IS_DEBUG_OSPF(lsa, LSA_GENERATE)) {
+		zlog_debug(
+			"LSA[Type%d:%pI4]: Refresh Opaque-LSA/ROUTER INFORMATION",
+			new->data->type, &new->data->id);
+		ospf_lsa_header_dump(new->data);
+	}
+
+	return new;
+}
+
+static void ospf_router_info_lsa_schedule(struct ospf_ri_area_info *ai,
+					  enum lsa_opcode opcode)
+{
+	struct ospf_lsa lsa;
+	struct lsa_header lsah;
+	struct ospf *top;
+	uint32_t tmp;
+
+	memset(&lsa, 0, sizeof(lsa));
+	memset(&lsah, 0, sizeof(lsah));
+
+	zlog_debug("RI (%s): LSA schedule %s%s%s", __func__,
+		   opcode == REORIGINATE_THIS_LSA ? "Re-Originate" : "",
+		   opcode == REFRESH_THIS_LSA ? "Refresh" : "",
+		   opcode == FLUSH_THIS_LSA ? "Flush" : "");
+
+	/* Check LSA flags state coherence and collect area information */
+	if (OspfRI.scope == OSPF_OPAQUE_AREA_LSA) {
+		if ((ai == NULL) || (ai->area == NULL)) {
+			flog_warn(
+				EC_OSPF_LSA,
+				"RI (%s): Router Info is Area scope flooding but area is not set",
+				__func__);
+				return;
+		}
+
+		if (!CHECK_FLAG(ai->flags, RIFLG_LSA_ENGAGED)
+		    && (opcode != REORIGINATE_THIS_LSA))
+			return;
+
+		if (CHECK_FLAG(ai->flags, RIFLG_LSA_ENGAGED)
+		    && (opcode == REORIGINATE_THIS_LSA))
+			opcode = REFRESH_THIS_LSA;
+
+		lsa.area = ai->area;
+		top = ai->area->ospf;
+	} else {
+		if (!CHECK_FLAG(OspfRI.as_flags, RIFLG_LSA_ENGAGED)
+		    && (opcode != REORIGINATE_THIS_LSA))
+			return;
+
+		if (CHECK_FLAG(OspfRI.as_flags, RIFLG_LSA_ENGAGED)
+		    && (opcode == REORIGINATE_THIS_LSA))
+			opcode = REFRESH_THIS_LSA;
+
+		top = ospf_lookup_by_vrf_id(VRF_DEFAULT);
+		lsa.area = NULL;
+	}
+
+	lsa.data = &lsah;
+	lsah.type = OspfRI.scope;
+
+	/* LSA ID is set to 0 for the Router Information. See RFC 4970 */
+	tmp = SET_OPAQUE_LSID(OPAQUE_TYPE_ROUTER_INFORMATION_LSA, 0);
+	lsah.id.s_addr = htonl(tmp);
+
+	switch (opcode) {
+	case REORIGINATE_THIS_LSA:
+		if (OspfRI.scope == OSPF_OPAQUE_AREA_LSA)
+			ospf_opaque_lsa_reoriginate_schedule(
+				(void *)ai->area, OSPF_OPAQUE_AREA_LSA,
+				OPAQUE_TYPE_ROUTER_INFORMATION_LSA);
+		else
+			ospf_opaque_lsa_reoriginate_schedule(
+				(void *)top, OSPF_OPAQUE_AS_LSA,
+				OPAQUE_TYPE_ROUTER_INFORMATION_LSA);
+		break;
+	case REFRESH_THIS_LSA:
+		ospf_opaque_lsa_refresh_schedule(&lsa);
+		break;
+	case FLUSH_THIS_LSA:
+		if (OspfRI.scope == OSPF_OPAQUE_AREA_LSA)
+			UNSET_FLAG(ai->flags, RIFLG_LSA_ENGAGED);
+		else
+			UNSET_FLAG(OspfRI.as_flags, RIFLG_LSA_ENGAGED);
+		ospf_opaque_lsa_flush_schedule(&lsa);
+		break;
+	}
+
+	return;
+}
+
+/* Callback to handle Segment Routing information */
+static int ospf_router_info_lsa_update(struct ospf_lsa *lsa)
+{
+
+	/* Sanity Check */
+	if (lsa == NULL) {
+		flog_warn(EC_OSPF_LSA, "RI (%s): Abort! LSA is NULL",
+			  __func__);
+		return -1;
+	}
+
+	/* Process only Opaque LSA */
+	if ((lsa->data->type != OSPF_OPAQUE_AREA_LSA)
+	    && (lsa->data->type != OSPF_OPAQUE_AS_LSA))
+		return 0;
+
+	/* Process only Router Information LSA */
+	if (GET_OPAQUE_TYPE(ntohl(lsa->data->id.s_addr))
+	    != OPAQUE_TYPE_ROUTER_INFORMATION_LSA)
+		return 0;
+
+	/* Check if it is not my LSA */
+	if (IS_LSA_SELF(lsa))
+		return 0;
+
+	/* Check if Router Info & Segment Routing are enable */
+	if (!OspfRI.enabled || !OspfRI.sr_info.enabled)
+		return 0;
+
+	/* Call Segment Routing LSA update or deletion */
+	if (!IS_LSA_MAXAGE(lsa))
+		ospf_sr_ri_lsa_update(lsa);
+	else
+		ospf_sr_ri_lsa_delete(lsa);
+
+	return 0;
+}
+
+/*------------------------------------------------------------------------*
+ * Following are vty session control functions.
+ *------------------------------------------------------------------------*/
+
+#define check_tlv_size(size, msg)                                              \
+	do {                                                                   \
+		if (ntohs(tlvh->length) > size) {                              \
+			if (vty != NULL)                                       \
+				vty_out(vty, "  Wrong %s TLV size: %d(%d)\n",  \
+					msg, ntohs(tlvh->length), size);       \
+			else                                                   \
+				zlog_debug("    Wrong %s TLV size: %d(%d)",    \
+					   msg, ntohs(tlvh->length), size);    \
+			return size + TLV_HDR_SIZE;                            \
+		}                                                              \
+	} while (0)
+
+static uint16_t show_vty_router_cap(struct vty *vty, struct tlv_header *tlvh)
+{
+	struct ri_tlv_router_cap *top = (struct ri_tlv_router_cap *)tlvh;
+
+	check_tlv_size(RI_TLV_CAPABILITIES_SIZE, "Router Capabilities");
+
+	if (vty != NULL)
+		vty_out(vty, "  Router Capabilities: 0x%x\n",
+			ntohl(top->value));
+	else
+		zlog_debug("    Router Capabilities: 0x%x", ntohl(top->value));
+
+	return TLV_SIZE(tlvh);
+}
+
+static uint16_t show_vty_pce_subtlv_address(struct vty *vty,
+					    struct tlv_header *tlvh)
+{
+	struct ri_pce_subtlv_address *top =
+		(struct ri_pce_subtlv_address *)tlvh;
+
+	if (ntohs(top->address.type) == PCE_ADDRESS_IPV4) {
+		check_tlv_size(PCE_ADDRESS_IPV4_SIZE, "PCE Address");
+		if (vty != NULL)
+			vty_out(vty, "  PCE Address: %pI4\n",
+				&top->address.value);
+		else
+			zlog_debug("    PCE Address: %pI4",
+				   &top->address.value);
+	} else if (ntohs(top->address.type) == PCE_ADDRESS_IPV6) {
+		/* TODO: Add support to IPv6 with inet_ntop() */
+		check_tlv_size(PCE_ADDRESS_IPV6_SIZE, "PCE Address");
+		if (vty != NULL)
+			vty_out(vty, "  PCE Address: 0x%x\n",
+				ntohl(top->address.value.s_addr));
+		else
+			zlog_debug("    PCE Address: 0x%x",
+				   ntohl(top->address.value.s_addr));
+	} else {
+		if (vty != NULL)
+			vty_out(vty, "  Wrong PCE Address type: 0x%x\n",
+				ntohl(top->address.type));
+		else
+			zlog_debug("    Wrong PCE Address type: 0x%x",
+				   ntohl(top->address.type));
+	}
+
+	return TLV_SIZE(tlvh);
+}
+
+static uint16_t show_vty_pce_subtlv_path_scope(struct vty *vty,
+					       struct tlv_header *tlvh)
+{
+	struct ri_pce_subtlv_path_scope *top =
+		(struct ri_pce_subtlv_path_scope *)tlvh;
+
+	check_tlv_size(RI_PCE_SUBTLV_PATH_SCOPE_SIZE, "PCE Path Scope");
+
+	if (vty != NULL)
+		vty_out(vty, "  PCE Path Scope: 0x%x\n", ntohl(top->value));
+	else
+		zlog_debug("    PCE Path Scope: 0x%x", ntohl(top->value));
+
+	return TLV_SIZE(tlvh);
+}
+
+static uint16_t show_vty_pce_subtlv_domain(struct vty *vty,
+					   struct tlv_header *tlvh)
+{
+	struct ri_pce_subtlv_domain *top = (struct ri_pce_subtlv_domain *)tlvh;
+	struct in_addr tmp;
+
+	check_tlv_size(RI_PCE_SUBTLV_DOMAIN_SIZE, "PCE Domain");
+
+	if (ntohs(top->type) == PCE_DOMAIN_TYPE_AREA) {
+		tmp.s_addr = top->value;
+		if (vty != NULL)
+			vty_out(vty, "  PCE Domain Area: %pI4\n", &tmp);
+		else
+			zlog_debug("    PCE Domain Area: %pI4", &tmp);
+	} else if (ntohs(top->type) == PCE_DOMAIN_TYPE_AS) {
+		if (vty != NULL)
+			vty_out(vty, "  PCE Domain AS: %d\n",
+				ntohl(top->value));
+		else
+			zlog_debug("    PCE Domain AS: %d", ntohl(top->value));
+	} else {
+		if (vty != NULL)
+			vty_out(vty, "  Wrong PCE Domain type: %d\n",
+				ntohl(top->type));
+		else
+			zlog_debug("    Wrong PCE Domain type: %d",
+				   ntohl(top->type));
+	}
+
+	return TLV_SIZE(tlvh);
+}
+
+static uint16_t show_vty_pce_subtlv_neighbor(struct vty *vty,
+					     struct tlv_header *tlvh)
+{
+
+	struct ri_pce_subtlv_neighbor *top =
+		(struct ri_pce_subtlv_neighbor *)tlvh;
+	struct in_addr tmp;
+
+	check_tlv_size(RI_PCE_SUBTLV_NEIGHBOR_SIZE, "PCE Neighbor");
+
+	if (ntohs(top->type) == PCE_DOMAIN_TYPE_AREA) {
+		tmp.s_addr = top->value;
+		if (vty != NULL)
+			vty_out(vty, "  PCE Neighbor Area: %pI4\n", &tmp);
+		else
+			zlog_debug("    PCE Neighbor Area: %pI4", &tmp);
+	} else if (ntohs(top->type) == PCE_DOMAIN_TYPE_AS) {
+		if (vty != NULL)
+			vty_out(vty, "  PCE Neighbor AS: %d\n",
+				ntohl(top->value));
+		else
+			zlog_debug("    PCE Neighbor AS: %d",
+				   ntohl(top->value));
+	} else {
+		if (vty != NULL)
+			vty_out(vty, "  Wrong PCE Neighbor type: %d\n",
+				ntohl(top->type));
+		else
+			zlog_debug("    Wrong PCE Neighbor type: %d",
+				   ntohl(top->type));
+	}
+
+	return TLV_SIZE(tlvh);
+}
+
+static uint16_t show_vty_pce_subtlv_cap_flag(struct vty *vty,
+					     struct tlv_header *tlvh)
+{
+	struct ri_pce_subtlv_cap_flag *top =
+		(struct ri_pce_subtlv_cap_flag *)tlvh;
+
+	check_tlv_size(RI_PCE_SUBTLV_CAP_FLAG_SIZE, "PCE Capabilities");
+
+	if (vty != NULL)
+		vty_out(vty, "  PCE Capabilities Flag: 0x%x\n",
+			ntohl(top->value));
+	else
+		zlog_debug("    PCE Capabilities Flag: 0x%x",
+			   ntohl(top->value));
+
+	return TLV_SIZE(tlvh);
+}
+
+static uint16_t show_vty_unknown_tlv(struct vty *vty, struct tlv_header *tlvh,
+				     size_t buf_size)
+{
+	if (TLV_SIZE(tlvh) > buf_size) {
+		if (vty != NULL)
+			vty_out(vty,
+				"    TLV size %d exceeds buffer size. Abort!",
+				TLV_SIZE(tlvh));
+		else
+			zlog_debug(
+				"    TLV size %d exceeds buffer size. Abort!",
+				TLV_SIZE(tlvh));
+		return buf_size;
+	}
+
+	if (vty != NULL)
+		vty_out(vty, "  Unknown TLV: [type(0x%x), length(0x%x)]\n",
+			ntohs(tlvh->type), ntohs(tlvh->length));
+	else
+		zlog_debug("    Unknown TLV: [type(0x%x), length(0x%x)]",
+			   ntohs(tlvh->type), ntohs(tlvh->length));
+
+	return TLV_SIZE(tlvh);
+}
+
+static uint16_t show_vty_pce_info(struct vty *vty, struct tlv_header *ri,
+				  size_t buf_size)
+{
+	struct tlv_header *tlvh;
+	uint16_t length = ntohs(ri->length);
+	uint16_t sum = 0;
+
+	/* Verify that TLV length is valid against remaining buffer size */
+	if (length > buf_size) {
+		vty_out(vty,
+			"  PCE Info TLV size %d exceeds buffer size. Abort!\n",
+			length);
+		return buf_size;
+	}
+
+	for (tlvh = ri; sum < length; tlvh = TLV_HDR_NEXT(tlvh)) {
+		switch (ntohs(tlvh->type)) {
+		case RI_PCE_SUBTLV_ADDRESS:
+			sum += show_vty_pce_subtlv_address(vty, tlvh);
+			break;
+		case RI_PCE_SUBTLV_PATH_SCOPE:
+			sum += show_vty_pce_subtlv_path_scope(vty, tlvh);
+			break;
+		case RI_PCE_SUBTLV_DOMAIN:
+			sum += show_vty_pce_subtlv_domain(vty, tlvh);
+			break;
+		case RI_PCE_SUBTLV_NEIGHBOR:
+			sum += show_vty_pce_subtlv_neighbor(vty, tlvh);
+			break;
+		case RI_PCE_SUBTLV_CAP_FLAG:
+			sum += show_vty_pce_subtlv_cap_flag(vty, tlvh);
+			break;
+		default:
+			sum += show_vty_unknown_tlv(vty, tlvh, length - sum);
+			break;
+		}
+	}
+	return sum;
+}
+
+/* Display Segment Routing Algorithm TLV information */
+static uint16_t show_vty_sr_algorithm(struct vty *vty, struct tlv_header *tlvh)
+{
+	struct ri_sr_tlv_sr_algorithm *algo =
+		(struct ri_sr_tlv_sr_algorithm *)tlvh;
+	int i;
+
+	check_tlv_size(ALGORITHM_COUNT, "Segment Routing Algorithm");
+
+	if (vty != NULL) {
+		vty_out(vty, "  Segment Routing Algorithm TLV:\n");
+		for (i = 0; i < ntohs(algo->header.length); i++) {
+			switch (algo->value[i]) {
+			case 0:
+				vty_out(vty, "    Algorithm %d: SPF\n", i);
+				break;
+			case 1:
+				vty_out(vty, "    Algorithm %d: Strict SPF\n",
+					i);
+				break;
+			default:
+				vty_out(vty,
+					"  Algorithm %d: Unknown value %d\n", i,
+					algo->value[i]);
+				break;
+			}
+		}
+	} else {
+		zlog_debug("  Segment Routing Algorithm TLV:");
+		for (i = 0; i < ntohs(algo->header.length); i++)
+			switch (algo->value[i]) {
+			case 0:
+				zlog_debug("    Algorithm %d: SPF", i);
+				break;
+			case 1:
+				zlog_debug("    Algorithm %d: Strict SPF", i);
+				break;
+			default:
+				zlog_debug("    Algorithm %d: Unknown value %d",
+					   i, algo->value[i]);
+				break;
+			}
+	}
+
+	return TLV_SIZE(tlvh);
+}
+
+/* Display Segment Routing SID/Label Range TLV information */
+static uint16_t show_vty_sr_range(struct vty *vty, struct tlv_header *tlvh)
+{
+	struct ri_sr_tlv_sid_label_range *range =
+		(struct ri_sr_tlv_sid_label_range *)tlvh;
+
+	check_tlv_size(RI_SR_TLV_LABEL_RANGE_SIZE, "SR Label Range");
+
+	if (vty != NULL) {
+		vty_out(vty,
+			"  Segment Routing %s Range TLV:\n"
+			"    Range Size = %d\n"
+			"    SID Label = %d\n\n",
+			ntohs(range->header.type) == RI_SR_TLV_SRGB_LABEL_RANGE
+				? "Global"
+				: "Local",
+			GET_RANGE_SIZE(ntohl(range->size)),
+			GET_LABEL(ntohl(range->lower.value)));
+	} else {
+		zlog_debug(
+			"  Segment Routing %s Range TLV:  Range Size = %d  SID Label = %d",
+			ntohs(range->header.type) == RI_SR_TLV_SRGB_LABEL_RANGE
+				? "Global"
+				: "Local",
+			GET_RANGE_SIZE(ntohl(range->size)),
+			GET_LABEL(ntohl(range->lower.value)));
+	}
+
+	return TLV_SIZE(tlvh);
+}
+
+/* Display Segment Routing Maximum Stack Depth TLV information */
+static uint16_t show_vty_sr_msd(struct vty *vty, struct tlv_header *tlvh)
+{
+	struct ri_sr_tlv_node_msd *msd = (struct ri_sr_tlv_node_msd *)tlvh;
+
+	check_tlv_size(RI_SR_TLV_NODE_MSD_SIZE, "Node Maximum Stack Depth");
+
+	if (vty != NULL) {
+		vty_out(vty,
+			"  Segment Routing MSD TLV:\n"
+			"    Node Maximum Stack Depth = %d\n",
+			msd->value);
+	} else {
+		zlog_debug(
+			"  Segment Routing MSD TLV:  Node Maximum Stack Depth = %d",
+			msd->value);
+	}
+
+	return TLV_SIZE(tlvh);
+}
+
+static void ospf_router_info_show_info(struct vty *vty,
+				       struct json_object *json,
+				       struct ospf_lsa *lsa)
+{
+	struct lsa_header *lsah = lsa->data;
+	struct tlv_header *tlvh;
+	uint16_t length = 0, sum = 0;
+
+	if (json)
+		return;
+
+	/* Initialize TLV browsing */
+	length = lsa->size - OSPF_LSA_HEADER_SIZE;
+
+	for (tlvh = TLV_HDR_TOP(lsah); sum < length && tlvh;
+	     tlvh = TLV_HDR_NEXT(tlvh)) {
+		switch (ntohs(tlvh->type)) {
+		case RI_TLV_CAPABILITIES:
+			sum += show_vty_router_cap(vty, tlvh);
+			break;
+		case RI_TLV_PCE:
+			tlvh++;
+			sum += TLV_HDR_SIZE;
+			sum += show_vty_pce_info(vty, tlvh, length - sum);
+			break;
+		case RI_SR_TLV_SR_ALGORITHM:
+			sum += show_vty_sr_algorithm(vty, tlvh);
+			break;
+		case RI_SR_TLV_SRGB_LABEL_RANGE:
+		case RI_SR_TLV_SRLB_LABEL_RANGE:
+			sum += show_vty_sr_range(vty, tlvh);
+			break;
+		case RI_SR_TLV_NODE_MSD:
+			sum += show_vty_sr_msd(vty, tlvh);
+			break;
+
+		default:
+			sum += show_vty_unknown_tlv(vty, tlvh, length);
+			break;
+		}
+	}
+
+	return;
+}
+
+static void ospf_router_info_config_write_router(struct vty *vty)
+{
+	struct ospf_pce_info *pce = &OspfRI.pce_info;
+	struct listnode *node;
+	struct ri_pce_subtlv_domain *domain;
+	struct ri_pce_subtlv_neighbor *neighbor;
+	struct in_addr tmp;
+
+	if (!OspfRI.enabled)
+		return;
+
+	if (OspfRI.scope == OSPF_OPAQUE_AS_LSA)
+		vty_out(vty, " router-info as\n");
+	else
+		vty_out(vty, " router-info area\n");
+
+	if (OspfRI.pce_info.enabled) {
+
+		if (pce->pce_address.header.type != 0)
+			vty_out(vty, "  pce address %pI4\n",
+				&pce->pce_address.address.value);
+
+		if (pce->pce_cap_flag.header.type != 0)
+			vty_out(vty, "  pce flag 0x%x\n",
+				ntohl(pce->pce_cap_flag.value));
+
+		for (ALL_LIST_ELEMENTS_RO(pce->pce_domain, node, domain)) {
+			if (domain->header.type != 0) {
+				if (domain->type == PCE_DOMAIN_TYPE_AREA) {
+					tmp.s_addr = domain->value;
+					vty_out(vty, "  pce domain area %pI4\n",
+						&tmp);
+				} else {
+					vty_out(vty, "  pce domain as %d\n",
+						ntohl(domain->value));
+				}
+			}
+		}
+
+		for (ALL_LIST_ELEMENTS_RO(pce->pce_neighbor, node, neighbor)) {
+			if (neighbor->header.type != 0) {
+				if (neighbor->type == PCE_DOMAIN_TYPE_AREA) {
+					tmp.s_addr = neighbor->value;
+					vty_out(vty,
+						"  pce neighbor area %pI4\n",
+						&tmp);
+				} else {
+					vty_out(vty, "  pce neighbor as %d\n",
+						ntohl(neighbor->value));
+				}
+			}
+		}
+
+		if (pce->pce_scope.header.type != 0)
+			vty_out(vty, "  pce scope 0x%x\n",
+				ntohl(OspfRI.pce_info.pce_scope.value));
+	}
+	return;
+}
+
+/*------------------------------------------------------------------------*
+ * Following are vty command functions.
+ *------------------------------------------------------------------------*/
+/* Simple wrapper schedule RI LSA action in function of the scope */
+static void ospf_router_info_schedule(enum lsa_opcode opcode)
+{
+	struct listnode *node, *nnode;
+	struct ospf_ri_area_info *ai;
+
+	if (OspfRI.scope == OSPF_OPAQUE_AS_LSA) {
+		if (CHECK_FLAG(OspfRI.as_flags, RIFLG_LSA_ENGAGED))
+			ospf_router_info_lsa_schedule(NULL, opcode);
+		else if (opcode == REORIGINATE_THIS_LSA)
+			ospf_router_info_lsa_schedule(NULL, opcode);
+	} else {
+		for (ALL_LIST_ELEMENTS(OspfRI.area_info, node, nnode, ai)) {
+			if (CHECK_FLAG(ai->flags, RIFLG_LSA_ENGAGED))
+				ospf_router_info_lsa_schedule(ai, opcode);
+		}
+	}
+}
+
+DEFUN (router_info,
+       router_info_area_cmd,
+       "router-info <as|area [A.B.C.D]>",
+       OSPF_RI_STR
+       "Enable the Router Information functionality with AS flooding scope\n"
+       "Enable the Router Information functionality with Area flooding scope\n"
+       "OSPF area ID in IP format (deprecated)\n")
+{
+	int idx_mode = 1;
+	uint8_t scope;
+
+	if (OspfRI.enabled)
+		return CMD_SUCCESS;
+
+	/* Check and get Area value if present */
+	if (strncmp(argv[idx_mode]->arg, "as", 2) == 0)
+		scope = OSPF_OPAQUE_AS_LSA;
+	else
+		scope = OSPF_OPAQUE_AREA_LSA;
+
+	/* First start to register Router Information callbacks */
+	if (!OspfRI.registered && (ospf_router_info_register(scope)) != 0) {
+		vty_out(vty,
+			"%% Unable to register Router Information callbacks.");
+		flog_err(
+			EC_OSPF_INIT_FAIL,
+			"RI (%s): Unable to register Router Information callbacks. Abort!",
+			__func__);
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	OspfRI.enabled = true;
+
+	if (IS_DEBUG_OSPF_EVENT)
+		zlog_debug("RI-> Router Information (%s flooding): OFF -> ON",
+			   OspfRI.scope == OSPF_OPAQUE_AREA_LSA ? "Area"
+								: "AS");
+
+	/*
+	 * Following code is intended to handle two cases;
+	 *
+	 * 1) Router Information was disabled at startup time, but now become
+	 * enabled.
+	 * 2) Router Information was once enabled then disabled, and now enabled
+	 * again.
+	 */
+
+	initialize_params(&OspfRI);
+
+	/* Originate or Refresh RI LSA if already engaged */
+	ospf_router_info_schedule(REORIGINATE_THIS_LSA);
+	return CMD_SUCCESS;
+}
+
+
+DEFUN (no_router_info,
+       no_router_info_cmd,
+       "no router-info",
+       NO_STR
+       "Disable the Router Information functionality\n")
+{
+
+	if (!OspfRI.enabled)
+		return CMD_SUCCESS;
+
+	if (IS_DEBUG_OSPF_EVENT)
+		zlog_debug("RI-> Router Information: ON -> OFF");
+
+	ospf_router_info_schedule(FLUSH_THIS_LSA);
+
+	OspfRI.enabled = false;
+
+	return CMD_SUCCESS;
+}
+
+static int ospf_ri_enabled(struct vty *vty)
+{
+	if (OspfRI.enabled)
+		return 1;
+
+	if (vty)
+		vty_out(vty, "%% OSPF RI is not turned on\n");
+
+	return 0;
+}
+
+DEFUN (pce_address,
+       pce_address_cmd,
+       "pce address A.B.C.D",
+       PCE_STR
+       "Stable IP address of the PCE\n"
+       "PCE address in IPv4 address format\n")
+{
+	int idx_ipv4 = 2;
+	struct in_addr value;
+	struct ospf_pce_info *pi = &OspfRI.pce_info;
+
+	if (!ospf_ri_enabled(vty))
+		return CMD_WARNING_CONFIG_FAILED;
+
+	if (!inet_aton(argv[idx_ipv4]->arg, &value)) {
+		vty_out(vty, "Please specify PCE Address by A.B.C.D\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	if (ntohs(pi->pce_address.header.type) == 0
+	    || ntohl(pi->pce_address.address.value.s_addr)
+		       != ntohl(value.s_addr)) {
+
+		set_pce_address(value, pi);
+
+		/* Refresh RI LSA if already engaged */
+		ospf_router_info_schedule(REFRESH_THIS_LSA);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_pce_address,
+       no_pce_address_cmd,
+       "no pce address [A.B.C.D]",
+       NO_STR
+       PCE_STR
+       "Disable PCE address\n"
+       "PCE address in IPv4 address format\n")
+{
+
+	unset_param(&OspfRI.pce_info.pce_address);
+
+	/* Refresh RI LSA if already engaged */
+	ospf_router_info_schedule(REFRESH_THIS_LSA);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (pce_path_scope,
+       pce_path_scope_cmd,
+       "pce scope BITPATTERN",
+       PCE_STR
+       "Path scope visibilities of the PCE for path computation\n"
+       "32-bit Hexadecimal value\n")
+{
+	int idx_bitpattern = 2;
+	uint32_t scope;
+	struct ospf_pce_info *pi = &OspfRI.pce_info;
+
+	if (!ospf_ri_enabled(vty))
+		return CMD_WARNING_CONFIG_FAILED;
+
+	if (sscanf(argv[idx_bitpattern]->arg, "0x%x", &scope) != 1) {
+		vty_out(vty, "pce_path_scope: fscanf: %s\n",
+			safe_strerror(errno));
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	if (ntohl(pi->pce_scope.header.type) == 0
+	    || scope != pi->pce_scope.value) {
+		set_pce_path_scope(scope, pi);
+
+		/* Refresh RI LSA if already engaged */
+		ospf_router_info_schedule(REFRESH_THIS_LSA);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_pce_path_scope,
+       no_pce_path_scope_cmd,
+       "no pce scope [BITPATTERN]",
+       NO_STR
+       PCE_STR
+       "Disable PCE path scope\n"
+       "32-bit Hexadecimal value\n")
+{
+
+	unset_param(&OspfRI.pce_info.pce_address);
+
+	/* Refresh RI LSA if already engaged */
+	ospf_router_info_schedule(REFRESH_THIS_LSA);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (pce_domain,
+       pce_domain_cmd,
+       "pce domain as (0-65535)",
+       PCE_STR
+       "Configure PCE domain AS number\n"
+       "AS number where the PCE as visibilities for path computation\n"
+       "AS number in decimal <0-65535>\n")
+{
+	int idx_number = 3;
+
+	uint32_t as;
+	struct ospf_pce_info *pce = &OspfRI.pce_info;
+	struct listnode *node;
+	struct ri_pce_subtlv_domain *domain;
+
+	if (!ospf_ri_enabled(vty))
+		return CMD_WARNING_CONFIG_FAILED;
+
+	if (sscanf(argv[idx_number]->arg, "%" SCNu32, &as) != 1) {
+		vty_out(vty, "pce_domain: fscanf: %s\n", safe_strerror(errno));
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* Check if the domain is not already in the domain list */
+	for (ALL_LIST_ELEMENTS_RO(pce->pce_domain, node, domain)) {
+		if (ntohl(domain->header.type) == 0 && as == domain->value)
+			return CMD_SUCCESS;
+	}
+
+	/* Create new domain if not found */
+	set_pce_domain(PCE_DOMAIN_TYPE_AS, as, pce);
+
+	/* Refresh RI LSA if already engaged */
+	ospf_router_info_schedule(REFRESH_THIS_LSA);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_pce_domain,
+       no_pce_domain_cmd,
+       "no pce domain as (0-65535)",
+       NO_STR
+       PCE_STR
+       "Disable PCE domain AS number\n"
+       "AS number where the PCE as visibilities for path computation\n"
+       "AS number in decimal <0-65535>\n")
+{
+	int idx_number = 4;
+
+	uint32_t as;
+	struct ospf_pce_info *pce = &OspfRI.pce_info;
+
+	if (sscanf(argv[idx_number]->arg, "%" SCNu32, &as) != 1) {
+		vty_out(vty, "no_pce_domain: fscanf: %s\n",
+			safe_strerror(errno));
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* Unset corresponding PCE domain */
+	unset_pce_domain(PCE_DOMAIN_TYPE_AS, as, pce);
+
+	/* Refresh RI LSA if already engaged */
+	ospf_router_info_schedule(REFRESH_THIS_LSA);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (pce_neigbhor,
+       pce_neighbor_cmd,
+       "pce neighbor as (0-65535)",
+       PCE_STR
+       "Configure PCE neighbor domain AS number\n"
+       "AS number of PCE neighbors\n"
+       "AS number in decimal <0-65535>\n")
+{
+	int idx_number = 3;
+
+	uint32_t as;
+	struct ospf_pce_info *pce = &OspfRI.pce_info;
+	struct listnode *node;
+	struct ri_pce_subtlv_neighbor *neighbor;
+
+	if (!ospf_ri_enabled(vty))
+		return CMD_WARNING_CONFIG_FAILED;
+
+	if (sscanf(argv[idx_number]->arg, "%" SCNu32, &as) != 1) {
+		vty_out(vty, "pce_neighbor: fscanf: %s\n",
+			safe_strerror(errno));
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* Check if the domain is not already in the domain list */
+	for (ALL_LIST_ELEMENTS_RO(pce->pce_neighbor, node, neighbor)) {
+		if (ntohl(neighbor->header.type) == 0 && as == neighbor->value)
+			return CMD_SUCCESS;
+	}
+
+	/* Create new domain if not found */
+	set_pce_neighbor(PCE_DOMAIN_TYPE_AS, as, pce);
+
+	/* Refresh RI LSA if already engaged */
+	ospf_router_info_schedule(REFRESH_THIS_LSA);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_pce_neighbor,
+       no_pce_neighbor_cmd,
+       "no pce neighbor as (0-65535)",
+       NO_STR
+       PCE_STR
+       "Disable PCE neighbor AS number\n"
+       "AS number of PCE neighbor\n"
+       "AS number in decimal <0-65535>\n")
+{
+	int idx_number = 4;
+
+	uint32_t as;
+	struct ospf_pce_info *pce = &OspfRI.pce_info;
+
+	if (sscanf(argv[idx_number]->arg, "%" SCNu32, &as) != 1) {
+		vty_out(vty, "no_pce_neighbor: fscanf: %s\n",
+			safe_strerror(errno));
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* Unset corresponding PCE domain */
+	unset_pce_neighbor(PCE_DOMAIN_TYPE_AS, as, pce);
+
+	/* Refresh RI LSA if already engaged */
+	ospf_router_info_schedule(REFRESH_THIS_LSA);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (pce_cap_flag,
+       pce_cap_flag_cmd,
+       "pce flag BITPATTERN",
+       PCE_STR
+       "Capabilities of the PCE for path computation\n"
+       "32-bit Hexadecimal value\n")
+{
+	int idx_bitpattern = 2;
+
+	uint32_t cap;
+	struct ospf_pce_info *pce = &OspfRI.pce_info;
+
+	if (!ospf_ri_enabled(vty))
+		return CMD_WARNING_CONFIG_FAILED;
+
+	if (sscanf(argv[idx_bitpattern]->arg, "0x%x", &cap) != 1) {
+		vty_out(vty, "pce_cap_flag: fscanf: %s\n",
+			safe_strerror(errno));
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	if (ntohl(pce->pce_cap_flag.header.type) == 0
+	    || cap != pce->pce_cap_flag.value) {
+		set_pce_cap_flag(cap, pce);
+
+		/* Refresh RI LSA if already engaged */
+		ospf_router_info_schedule(REFRESH_THIS_LSA);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_pce_cap_flag,
+       no_pce_cap_flag_cmd,
+       "no pce flag",
+       NO_STR
+       PCE_STR
+       "Disable PCE capabilities\n")
+{
+
+	unset_param(&OspfRI.pce_info.pce_cap_flag);
+
+	/* Refresh RI LSA if already engaged */
+	ospf_router_info_schedule(REFRESH_THIS_LSA);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (show_ip_ospf_router_info,
+       show_ip_ospf_router_info_cmd,
+       "show ip ospf router-info",
+       SHOW_STR
+       IP_STR
+       OSPF_STR
+       "Router Information\n")
+{
+
+	if (OspfRI.enabled) {
+		vty_out(vty, "--- Router Information parameters ---\n");
+		show_vty_router_cap(vty, &OspfRI.router_cap.header);
+	} else {
+		if (vty != NULL)
+			vty_out(vty,
+				"  Router Information is disabled on this router\n");
+	}
+	return CMD_SUCCESS;
+}
+
+DEFUN (show_ip_opsf_router_info_pce,
+       show_ip_ospf_router_info_pce_cmd,
+       "show ip ospf router-info pce",
+       SHOW_STR
+       IP_STR
+       OSPF_STR
+       "Router Information\n"
+       "PCE information\n")
+{
+
+	struct ospf_pce_info *pce = &OspfRI.pce_info;
+	struct listnode *node;
+	struct ri_pce_subtlv_domain *domain;
+	struct ri_pce_subtlv_neighbor *neighbor;
+
+	if ((OspfRI.enabled) && (OspfRI.pce_info.enabled)) {
+		vty_out(vty, "--- PCE parameters ---\n");
+
+		if (pce->pce_address.header.type != 0)
+			show_vty_pce_subtlv_address(vty,
+						    &pce->pce_address.header);
+
+		if (pce->pce_scope.header.type != 0)
+			show_vty_pce_subtlv_path_scope(vty,
+						       &pce->pce_scope.header);
+
+		for (ALL_LIST_ELEMENTS_RO(pce->pce_domain, node, domain)) {
+			if (domain->header.type != 0)
+				show_vty_pce_subtlv_domain(vty,
+							   &domain->header);
+		}
+
+		for (ALL_LIST_ELEMENTS_RO(pce->pce_neighbor, node, neighbor)) {
+			if (neighbor->header.type != 0)
+				show_vty_pce_subtlv_neighbor(vty,
+							     &neighbor->header);
+		}
+
+		if (pce->pce_cap_flag.header.type != 0)
+			show_vty_pce_subtlv_cap_flag(vty,
+						     &pce->pce_cap_flag.header);
+
+	} else {
+		vty_out(vty, "  PCE info is disabled on this router\n");
+	}
+
+	return CMD_SUCCESS;
+}
+
+/* Install new CLI commands */
+static void ospf_router_info_register_vty(void)
+{
+	install_element(VIEW_NODE, &show_ip_ospf_router_info_cmd);
+	install_element(VIEW_NODE, &show_ip_ospf_router_info_pce_cmd);
+
+	install_element(OSPF_NODE, &router_info_area_cmd);
+	install_element(OSPF_NODE, &no_router_info_cmd);
+	install_element(OSPF_NODE, &pce_address_cmd);
+	install_element(OSPF_NODE, &no_pce_address_cmd);
+	install_element(OSPF_NODE, &pce_path_scope_cmd);
+	install_element(OSPF_NODE, &no_pce_path_scope_cmd);
+	install_element(OSPF_NODE, &pce_domain_cmd);
+	install_element(OSPF_NODE, &no_pce_domain_cmd);
+	install_element(OSPF_NODE, &pce_neighbor_cmd);
+	install_element(OSPF_NODE, &no_pce_neighbor_cmd);
+	install_element(OSPF_NODE, &pce_cap_flag_cmd);
+	install_element(OSPF_NODE, &no_pce_cap_flag_cmd);
+
+	return;
+}