Adding upstream version 9.1.upstream/9.1

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

1 files changed, 2373 insertions, 0 deletions

diff --git a/ospf6d/ospf6_top.c b/ospf6d/ospf6_top.c
new file mode 100644
index 0000000..216837d
--- /dev/null
+++ b/ospf6d/ospf6_top.c
@@ -0,0 +1,2373 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2003 Yasuhiro Ohara
+ */
+
+#include <zebra.h>
+
+#include "log.h"
+#include "memory.h"
+#include "vty.h"
+#include "linklist.h"
+#include "prefix.h"
+#include "table.h"
+#include "frrevent.h"
+#include "command.h"
+#include "defaults.h"
+#include "lib/json.h"
+#include "lib_errors.h"
+
+#include "ospf6_proto.h"
+#include "ospf6_message.h"
+#include "ospf6_lsa.h"
+#include "ospf6_lsdb.h"
+#include "ospf6_route.h"
+#include "ospf6_zebra.h"
+
+#include "ospf6_top.h"
+#include "ospf6_area.h"
+#include "ospf6_interface.h"
+#include "ospf6_neighbor.h"
+#include "ospf6_network.h"
+
+#include "ospf6_flood.h"
+#include "ospf6_asbr.h"
+#include "ospf6_abr.h"
+#include "ospf6_intra.h"
+#include "ospf6_spf.h"
+#include "ospf6d.h"
+#include "ospf6_gr.h"
+#include "lib/json.h"
+#include "ospf6_nssa.h"
+#include "ospf6_auth_trailer.h"
+
+DEFINE_MTYPE_STATIC(OSPF6D, OSPF6_TOP, "OSPF6 top");
+
+DEFINE_QOBJ_TYPE(ospf6);
+
+FRR_CFG_DEFAULT_BOOL(OSPF6_LOG_ADJACENCY_CHANGES,
+	{ .val_bool = true, .match_profile = "datacenter", },
+	{ .val_bool = false },
+);
+
+#include "ospf6d/ospf6_top_clippy.c"
+
+/* global ospf6d variable */
+static struct ospf6_master ospf6_master;
+struct ospf6_master *om6;
+
+static void ospf6_disable(struct ospf6 *o);
+
+static void ospf6_add(struct ospf6 *ospf6)
+{
+	listnode_add(om6->ospf6, ospf6);
+}
+
+static void ospf6_del(struct ospf6 *ospf6)
+{
+	listnode_delete(om6->ospf6, ospf6);
+}
+
+const char *ospf6_vrf_id_to_name(vrf_id_t vrf_id)
+{
+	struct vrf *vrf = vrf_lookup_by_id(vrf_id);
+
+	return vrf ? vrf->name : "NIL";
+}
+
+/* Link OSPF instance to VRF. */
+void ospf6_vrf_link(struct ospf6 *ospf6, struct vrf *vrf)
+{
+	ospf6->vrf_id = vrf->vrf_id;
+	if (vrf->info != (void *)ospf6)
+		vrf->info = (void *)ospf6;
+}
+
+/* Unlink OSPF instance from VRF. */
+void ospf6_vrf_unlink(struct ospf6 *ospf6, struct vrf *vrf)
+{
+	if (vrf->info == (void *)ospf6)
+		vrf->info = NULL;
+	ospf6->vrf_id = VRF_UNKNOWN;
+}
+
+struct ospf6 *ospf6_lookup_by_vrf_id(vrf_id_t vrf_id)
+{
+	struct vrf *vrf = NULL;
+
+	vrf = vrf_lookup_by_id(vrf_id);
+	if (!vrf)
+		return NULL;
+	return (vrf->info) ? (struct ospf6 *)vrf->info : NULL;
+}
+
+struct ospf6 *ospf6_lookup_by_vrf_name(const char *name)
+{
+	struct ospf6 *o = NULL;
+	struct listnode *node, *nnode;
+
+	for (ALL_LIST_ELEMENTS(om6->ospf6, node, nnode, o)) {
+		if (((o->name == NULL && name == NULL)
+		     || (o->name && name && strcmp(o->name, name) == 0)))
+			return o;
+	}
+	return NULL;
+}
+
+/* This is hook function for vrf create called as part of vrf_init */
+static int ospf6_vrf_new(struct vrf *vrf)
+{
+	return 0;
+}
+
+/* This is hook function for vrf delete call as part of vrf_init */
+static int ospf6_vrf_delete(struct vrf *vrf)
+{
+	return 0;
+}
+
+static void ospf6_set_redist_vrf_bitmaps(struct ospf6 *ospf6, bool set)
+{
+	int type;
+	struct list *red_list;
+
+	for (type = 0; type < ZEBRA_ROUTE_MAX; type++) {
+		red_list = ospf6->redist[type];
+		if (!red_list)
+			continue;
+		if (IS_OSPF6_DEBUG_ZEBRA(RECV))
+			zlog_debug(
+				"%s: setting redist vrf %d bitmap for type %d",
+				__func__, ospf6->vrf_id, type);
+		if (set)
+			vrf_bitmap_set(&zclient->redist[AFI_IP6][type],
+				       ospf6->vrf_id);
+		else
+			vrf_bitmap_unset(&zclient->redist[AFI_IP6][type],
+					 ospf6->vrf_id);
+	}
+
+	red_list = ospf6->redist[DEFAULT_ROUTE];
+	if (red_list) {
+		if (set)
+			vrf_bitmap_set(&zclient->default_information[AFI_IP6],
+				       ospf6->vrf_id);
+		else
+			vrf_bitmap_unset(&zclient->default_information[AFI_IP6],
+					 ospf6->vrf_id);
+	}
+}
+
+/* Disable OSPF6 VRF instance */
+static int ospf6_vrf_disable(struct vrf *vrf)
+{
+	struct ospf6 *ospf6 = NULL;
+
+	if (vrf->vrf_id == VRF_DEFAULT)
+		return 0;
+
+	ospf6 = ospf6_lookup_by_vrf_name(vrf->name);
+	if (ospf6) {
+		ospf6_zebra_vrf_deregister(ospf6);
+
+		ospf6_set_redist_vrf_bitmaps(ospf6, false);
+
+		/* We have instance configured, unlink
+		 * from VRF and make it "down".
+		 */
+		ospf6_vrf_unlink(ospf6, vrf);
+		event_cancel(&ospf6->t_ospf6_receive);
+		close(ospf6->fd);
+		ospf6->fd = -1;
+	}
+
+	/* Note: This is a callback, the VRF will be deleted by the caller. */
+	return 0;
+}
+
+/* Enable OSPF6 VRF instance */
+static int ospf6_vrf_enable(struct vrf *vrf)
+{
+	struct ospf6 *ospf6 = NULL;
+	vrf_id_t old_vrf_id;
+	int ret = 0;
+
+	ospf6 = ospf6_lookup_by_vrf_name(vrf->name);
+	if (ospf6) {
+		old_vrf_id = ospf6->vrf_id;
+		/* We have instance configured, link to VRF and make it "up". */
+		ospf6_vrf_link(ospf6, vrf);
+
+		if (old_vrf_id != ospf6->vrf_id) {
+			ospf6_set_redist_vrf_bitmaps(ospf6, true);
+
+			/* start zebra redist to us for new vrf */
+			ospf6_zebra_vrf_register(ospf6);
+
+			ret = ospf6_serv_sock(ospf6);
+			if (ret < 0 || ospf6->fd <= 0)
+				return 0;
+			event_add_read(master, ospf6_receive, ospf6, ospf6->fd,
+				       &ospf6->t_ospf6_receive);
+
+			ospf6_router_id_update(ospf6, true);
+		}
+	}
+
+	return 0;
+}
+
+void ospf6_vrf_init(void)
+{
+	vrf_init(ospf6_vrf_new, ospf6_vrf_enable, ospf6_vrf_disable,
+		 ospf6_vrf_delete);
+
+	vrf_cmd_init(NULL);
+}
+
+static void ospf6_top_lsdb_hook_add(struct ospf6_lsa *lsa)
+{
+	switch (ntohs(lsa->header->type)) {
+	case OSPF6_LSTYPE_AS_EXTERNAL:
+		ospf6_asbr_lsa_add(lsa);
+		break;
+
+	default:
+		break;
+	}
+}
+
+static void ospf6_top_lsdb_hook_remove(struct ospf6_lsa *lsa)
+{
+	switch (ntohs(lsa->header->type)) {
+	case OSPF6_LSTYPE_AS_EXTERNAL:
+		ospf6_asbr_lsa_remove(lsa, NULL);
+		break;
+
+	default:
+		break;
+	}
+}
+
+static void ospf6_top_route_hook_add(struct ospf6_route *route)
+{
+	struct ospf6 *ospf6 = NULL;
+	struct ospf6_area *oa = NULL;
+
+	if (route->table->scope_type == OSPF6_SCOPE_TYPE_GLOBAL)
+		ospf6 = route->table->scope;
+	else if (route->table->scope_type == OSPF6_SCOPE_TYPE_AREA) {
+		oa = (struct ospf6_area *)route->table->scope;
+		ospf6 = oa->ospf6;
+	} else {
+		if (IS_OSPF6_DEBUG_EXAMIN(AS_EXTERNAL)
+		    || IS_OSPF6_DEBUG_BROUTER)
+			zlog_debug(
+				"%s: Route is not GLOBAL or scope is not of TYPE_AREA: %pFX",
+				__func__, &route->prefix);
+		return;
+	}
+
+	ospf6_abr_originate_summary(route, ospf6);
+	ospf6_zebra_route_update_add(route, ospf6);
+}
+
+static void ospf6_top_route_hook_remove(struct ospf6_route *route)
+{
+	struct ospf6 *ospf6 = NULL;
+	struct ospf6_area *oa = NULL;
+
+	if (route->table->scope_type == OSPF6_SCOPE_TYPE_GLOBAL)
+		ospf6 = route->table->scope;
+	else if (route->table->scope_type == OSPF6_SCOPE_TYPE_AREA) {
+		oa = (struct ospf6_area *)route->table->scope;
+		ospf6 = oa->ospf6;
+	} else {
+		if (IS_OSPF6_DEBUG_EXAMIN(AS_EXTERNAL)
+		    || IS_OSPF6_DEBUG_BROUTER)
+			zlog_debug(
+				"%s: Route is not GLOBAL or scope is not of TYPE_AREA: %pFX",
+				__func__, &route->prefix);
+		return;
+	}
+
+	route->flag |= OSPF6_ROUTE_REMOVE;
+	ospf6_abr_originate_summary(route, ospf6);
+	ospf6_zebra_route_update_remove(route, ospf6);
+}
+
+static void ospf6_top_brouter_hook_add(struct ospf6_route *route)
+{
+	struct ospf6 *ospf6 = route->table->scope;
+
+	if (IS_OSPF6_DEBUG_EXAMIN(AS_EXTERNAL) ||
+	    IS_OSPF6_DEBUG_BROUTER) {
+		uint32_t brouter_id;
+		char brouter_name[16];
+
+		brouter_id = ADV_ROUTER_IN_PREFIX(&route->prefix);
+		inet_ntop(AF_INET, &brouter_id, brouter_name,
+			  sizeof(brouter_name));
+		zlog_debug("%s: brouter %s add with adv router %x nh count %u",
+			   __func__, brouter_name,
+			   route->path.origin.adv_router,
+			   listcount(route->nh_list));
+	}
+	ospf6_abr_examin_brouter(ADV_ROUTER_IN_PREFIX(&route->prefix), route,
+				 ospf6);
+	ospf6_asbr_lsentry_add(route, ospf6);
+	ospf6_abr_originate_summary(route, ospf6);
+}
+
+static void ospf6_top_brouter_hook_remove(struct ospf6_route *route)
+{
+	struct ospf6 *ospf6 = route->table->scope;
+
+	if (IS_OSPF6_DEBUG_EXAMIN(AS_EXTERNAL) ||
+	    IS_OSPF6_DEBUG_BROUTER) {
+		uint32_t brouter_id;
+		char brouter_name[16];
+
+		brouter_id = ADV_ROUTER_IN_PREFIX(&route->prefix);
+		inet_ntop(AF_INET, &brouter_id, brouter_name,
+			  sizeof(brouter_name));
+		zlog_debug("%s: brouter %p %s del with adv router %x nh %u",
+			   __func__, (void *)route, brouter_name,
+			   route->path.origin.adv_router,
+			   listcount(route->nh_list));
+	}
+	route->flag |= OSPF6_ROUTE_REMOVE;
+	ospf6_abr_examin_brouter(ADV_ROUTER_IN_PREFIX(&route->prefix), route,
+				 ospf6);
+	ospf6_asbr_lsentry_remove(route, ospf6);
+	ospf6_abr_originate_summary(route, ospf6);
+}
+
+static struct ospf6 *ospf6_create(const char *name)
+{
+	struct ospf6 *o;
+	struct vrf *vrf = NULL;
+
+	o = XCALLOC(MTYPE_OSPF6_TOP, sizeof(struct ospf6));
+
+	vrf = vrf_lookup_by_name(name);
+	if (vrf) {
+		o->vrf_id = vrf->vrf_id;
+	} else
+		o->vrf_id = VRF_UNKNOWN;
+
+	/* Freed in ospf6_delete */
+	o->name = XSTRDUP(MTYPE_OSPF6_TOP, name);
+	if (vrf)
+		ospf6_vrf_link(o, vrf);
+
+	ospf6_zebra_vrf_register(o);
+
+	/* initialize */
+	monotime(&o->starttime);
+	o->area_list = list_new();
+	o->area_list->cmp = ospf6_area_cmp;
+	o->lsdb = ospf6_lsdb_create(o);
+	o->lsdb_self = ospf6_lsdb_create(o);
+	o->lsdb->hook_add = ospf6_top_lsdb_hook_add;
+	o->lsdb->hook_remove = ospf6_top_lsdb_hook_remove;
+
+	o->spf_delay = OSPF_SPF_DELAY_DEFAULT;
+	o->spf_holdtime = OSPF_SPF_HOLDTIME_DEFAULT;
+	o->spf_max_holdtime = OSPF_SPF_MAX_HOLDTIME_DEFAULT;
+	o->spf_hold_multiplier = 1;
+
+	o->default_originate = DEFAULT_ORIGINATE_NONE;
+	o->redistribute = 0;
+	/* LSA timers value init */
+	o->lsa_minarrival = OSPF_MIN_LS_ARRIVAL;
+
+	o->route_table = OSPF6_ROUTE_TABLE_CREATE(GLOBAL, ROUTES);
+	o->route_table->scope = o;
+	o->route_table->hook_add = ospf6_top_route_hook_add;
+	o->route_table->hook_remove = ospf6_top_route_hook_remove;
+
+	o->brouter_table = OSPF6_ROUTE_TABLE_CREATE(GLOBAL, BORDER_ROUTERS);
+	o->brouter_table->scope = o;
+	o->brouter_table->hook_add = ospf6_top_brouter_hook_add;
+	o->brouter_table->hook_remove = ospf6_top_brouter_hook_remove;
+
+	o->external_table = OSPF6_ROUTE_TABLE_CREATE(GLOBAL, EXTERNAL_ROUTES);
+	o->external_table->scope = o;
+	/* Setting this to 1, so that the LS ID 0 can be considered as invalid
+	 * for self originated external LSAs. This helps in differentiating if
+	 * an LSA is originated for any route or not in the route data.
+	 * rt->route_option->id is by default 0
+	 * Consider a route having id as 0 and prefix as 1::1, an external LSA
+	 * is originated with ID 0.0.0.0. Now consider another route 2::2
+	 * and for this LSA was not originated because of some configuration
+	 * but the ID field rt->route_option->id is still 0.Consider now this
+	 * 2::2 is being deleted, it will search LSA with LS ID as 0 and it
+	 * will find the LSA and hence delete it but the LSA belonged to prefix
+	 * 1::1, this happened because of LS ID 0.
+	 */
+	o->external_id = OSPF6_EXT_INIT_LS_ID;
+
+	o->write_oi_count = OSPF6_WRITE_INTERFACE_COUNT_DEFAULT;
+	o->ref_bandwidth = OSPF6_REFERENCE_BANDWIDTH;
+
+	o->distance_table = route_table_init();
+
+	o->rt_aggr_tbl = route_table_init();
+	o->aggr_delay_interval = OSPF6_EXTL_AGGR_DEFAULT_DELAY;
+	o->aggr_action = OSPF6_ROUTE_AGGR_NONE;
+
+	o->fd = -1;
+
+	o->max_multipath = MULTIPATH_NUM;
+
+	o->oi_write_q = list_new();
+
+	ospf6_gr_helper_init(o);
+	QOBJ_REG(o, ospf6);
+
+	/* Make ospf protocol socket. */
+	ospf6_serv_sock(o);
+
+	/* If sequence number is stored in persistent storage, read it.
+	 */
+	if (ospf6_auth_nvm_file_exist() == OSPF6_AUTH_FILE_EXIST) {
+		ospf6_auth_seqno_nvm_read(o);
+		o->seqnum_h = o->seqnum_h + 1;
+		ospf6_auth_seqno_nvm_update(o);
+	} else {
+		o->seqnum_l = o->seqnum_h = 0;
+		ospf6_auth_seqno_nvm_update(o);
+	}
+
+	return o;
+}
+
+struct ospf6 *ospf6_instance_create(const char *name)
+{
+	struct ospf6 *ospf6;
+	struct vrf *vrf;
+	struct interface *ifp;
+
+	ospf6 = ospf6_create(name);
+	if (DFLT_OSPF6_LOG_ADJACENCY_CHANGES)
+		SET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_CHANGES);
+	if (ospf6->router_id == 0)
+		ospf6_router_id_update(ospf6, true);
+	ospf6_add(ospf6);
+
+	/*
+	 * Read from non-volatile memory whether this instance is performing a
+	 * graceful restart or not.
+	 */
+	ospf6_gr_nvm_read(ospf6);
+
+	if (ospf6->vrf_id != VRF_UNKNOWN) {
+		vrf = vrf_lookup_by_id(ospf6->vrf_id);
+		FOR_ALL_INTERFACES (vrf, ifp) {
+			if (ifp->info)
+				ospf6_interface_start(ifp->info);
+		}
+	}
+	if (ospf6->fd < 0)
+		return ospf6;
+
+	event_add_read(master, ospf6_receive, ospf6, ospf6->fd,
+		       &ospf6->t_ospf6_receive);
+
+	return ospf6;
+}
+
+void ospf6_delete(struct ospf6 *o)
+{
+	struct listnode *node, *nnode;
+	struct route_node *rn = NULL;
+	struct ospf6_area *oa;
+	struct vrf *vrf;
+	struct ospf6_external_aggr_rt *aggr;
+
+	QOBJ_UNREG(o);
+
+	ospf6_gr_helper_deinit(o);
+	if (!o->gr_info.prepare_in_progress)
+		ospf6_flush_self_originated_lsas_now(o);
+	XFREE(MTYPE_TMP, o->gr_info.exit_reason);
+	ospf6_disable(o);
+	ospf6_del(o);
+
+	ospf6_zebra_vrf_deregister(o);
+
+	ospf6_serv_close(&o->fd);
+
+	for (ALL_LIST_ELEMENTS(o->area_list, node, nnode, oa))
+		ospf6_area_delete(oa);
+
+
+	list_delete(&o->area_list);
+
+	ospf6_lsdb_delete(o->lsdb);
+	ospf6_lsdb_delete(o->lsdb_self);
+
+	ospf6_route_table_delete(o->route_table);
+	ospf6_route_table_delete(o->brouter_table);
+
+	ospf6_route_table_delete(o->external_table);
+
+	ospf6_distance_reset(o);
+	route_table_finish(o->distance_table);
+	list_delete(&o->oi_write_q);
+
+	if (o->vrf_id != VRF_UNKNOWN) {
+		vrf = vrf_lookup_by_id(o->vrf_id);
+		if (vrf)
+			ospf6_vrf_unlink(o, vrf);
+	}
+
+	for (rn = route_top(o->rt_aggr_tbl); rn; rn = route_next(rn))
+		if (rn->info) {
+			aggr = rn->info;
+			ospf6_asbr_summary_config_delete(o, rn);
+			ospf6_external_aggregator_free(aggr);
+		}
+	route_table_finish(o->rt_aggr_tbl);
+
+	XFREE(MTYPE_OSPF6_TOP, o->name);
+	XFREE(MTYPE_OSPF6_TOP, o);
+}
+
+static void ospf6_disable(struct ospf6 *o)
+{
+	struct listnode *node, *nnode;
+	struct ospf6_area *oa;
+
+	if (!CHECK_FLAG(o->flag, OSPF6_DISABLED)) {
+		SET_FLAG(o->flag, OSPF6_DISABLED);
+
+		for (ALL_LIST_ELEMENTS(o->area_list, node, nnode, oa))
+			ospf6_area_disable(oa);
+
+		/* XXX: This also changes persistent settings */
+		/* Unregister redistribution */
+		ospf6_asbr_redistribute_disable(o);
+
+		ospf6_lsdb_remove_all(o->lsdb);
+		ospf6_route_remove_all(o->route_table);
+		ospf6_route_remove_all(o->brouter_table);
+
+		EVENT_OFF(o->maxage_remover);
+		EVENT_OFF(o->t_spf_calc);
+		EVENT_OFF(o->t_ase_calc);
+		EVENT_OFF(o->t_distribute_update);
+		EVENT_OFF(o->t_ospf6_receive);
+		EVENT_OFF(o->t_external_aggr);
+		EVENT_OFF(o->gr_info.t_grace_period);
+		EVENT_OFF(o->t_write);
+		EVENT_OFF(o->t_abr_task);
+	}
+}
+
+void ospf6_master_init(struct event_loop *master)
+{
+	memset(&ospf6_master, 0, sizeof(ospf6_master));
+
+	om6 = &ospf6_master;
+	om6->ospf6 = list_new();
+	om6->master = master;
+}
+
+static void ospf6_maxage_remover(struct event *thread)
+{
+	struct ospf6 *o = (struct ospf6 *)EVENT_ARG(thread);
+	struct ospf6_area *oa;
+	struct ospf6_interface *oi;
+	struct ospf6_neighbor *on;
+	struct listnode *i, *j, *k;
+	int reschedule = 0;
+
+	for (ALL_LIST_ELEMENTS_RO(o->area_list, i, oa)) {
+		for (ALL_LIST_ELEMENTS_RO(oa->if_list, j, oi)) {
+			for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, k, on)) {
+				if (on->state != OSPF6_NEIGHBOR_EXCHANGE
+				    && on->state != OSPF6_NEIGHBOR_LOADING)
+					continue;
+
+				ospf6_maxage_remove(o);
+				return;
+			}
+		}
+	}
+
+	for (ALL_LIST_ELEMENTS_RO(o->area_list, i, oa)) {
+		for (ALL_LIST_ELEMENTS_RO(oa->if_list, j, oi)) {
+			if (ospf6_lsdb_maxage_remover(oi->lsdb)) {
+				reschedule = 1;
+			}
+		}
+
+		if (ospf6_lsdb_maxage_remover(oa->lsdb)) {
+			reschedule = 1;
+		}
+	}
+
+	if (ospf6_lsdb_maxage_remover(o->lsdb)) {
+		reschedule = 1;
+	}
+
+	if (reschedule) {
+		ospf6_maxage_remove(o);
+	}
+}
+
+void ospf6_maxage_remove(struct ospf6 *o)
+{
+	if (o)
+		event_add_timer(master, ospf6_maxage_remover, o,
+				OSPF_LSA_MAXAGE_REMOVE_DELAY_DEFAULT,
+				&o->maxage_remover);
+}
+
+bool ospf6_router_id_update(struct ospf6 *ospf6, bool init)
+{
+	in_addr_t new_router_id;
+	struct listnode *node;
+	struct ospf6_area *oa;
+
+	if (!ospf6)
+		return true;
+
+	if (ospf6->router_id_static != 0)
+		new_router_id = ospf6->router_id_static;
+	else
+		new_router_id = ospf6->router_id_zebra;
+
+	if (ospf6->router_id == new_router_id)
+		return true;
+
+	if (!init)
+		for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, node, oa)) {
+			if (oa->full_nbrs) {
+				zlog_err(
+					"%s: cannot update router-id. Run the \"clear ipv6 ospf6 process\" command",
+					__func__);
+				return false;
+			}
+		}
+
+	ospf6->router_id = new_router_id;
+	return true;
+}
+
+/* start ospf6 */
+DEFUN_NOSH(router_ospf6, router_ospf6_cmd, "router ospf6 [vrf NAME]",
+	   ROUTER_STR OSPF6_STR VRF_CMD_HELP_STR)
+{
+	struct ospf6 *ospf6;
+	const char *vrf_name = VRF_DEFAULT_NAME;
+	int idx_vrf = 0;
+
+	if (argv_find(argv, argc, "vrf", &idx_vrf)) {
+		vrf_name = argv[idx_vrf + 1]->arg;
+	}
+
+	ospf6 = ospf6_lookup_by_vrf_name(vrf_name);
+	if (ospf6 == NULL)
+		ospf6 = ospf6_instance_create(vrf_name);
+
+	/* set current ospf point. */
+	VTY_PUSH_CONTEXT(OSPF6_NODE, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+/* stop ospf6 */
+DEFUN(no_router_ospf6, no_router_ospf6_cmd, "no router ospf6 [vrf NAME]",
+      NO_STR ROUTER_STR OSPF6_STR VRF_CMD_HELP_STR)
+{
+	struct ospf6 *ospf6;
+	const char *vrf_name = VRF_DEFAULT_NAME;
+	int idx_vrf = 0;
+
+	if (argv_find(argv, argc, "vrf", &idx_vrf)) {
+		vrf_name = argv[idx_vrf + 1]->arg;
+	}
+
+	ospf6 = ospf6_lookup_by_vrf_name(vrf_name);
+	if (ospf6 == NULL)
+		vty_out(vty, "OSPFv3 is not configured\n");
+	else {
+		if (ospf6->gr_info.restart_support)
+			ospf6_gr_nvm_delete(ospf6);
+
+		ospf6_delete(ospf6);
+		ospf6 = NULL;
+	}
+
+	/* return to config node . */
+	VTY_PUSH_CONTEXT_NULL(CONFIG_NODE);
+
+	return CMD_SUCCESS;
+}
+
+static void ospf6_db_clear(struct ospf6 *ospf6)
+{
+	struct ospf6_interface *oi;
+	struct interface *ifp;
+	struct vrf *vrf = vrf_lookup_by_id(ospf6->vrf_id);
+	struct listnode *node, *nnode;
+	struct ospf6_area *oa;
+
+	FOR_ALL_INTERFACES (vrf, ifp) {
+		if (if_is_operative(ifp) && ifp->info != NULL) {
+			oi = (struct ospf6_interface *)ifp->info;
+			ospf6_lsdb_remove_all(oi->lsdb);
+			ospf6_lsdb_remove_all(oi->lsdb_self);
+			ospf6_lsdb_remove_all(oi->lsupdate_list);
+			ospf6_lsdb_remove_all(oi->lsack_list);
+		}
+	}
+
+	for (ALL_LIST_ELEMENTS(ospf6->area_list, node, nnode, oa)) {
+		ospf6_lsdb_remove_all(oa->lsdb);
+		ospf6_lsdb_remove_all(oa->lsdb_self);
+
+		ospf6_spf_table_finish(oa->spf_table);
+		ospf6_route_remove_all(oa->route_table);
+	}
+
+	ospf6_lsdb_remove_all(ospf6->lsdb);
+	ospf6_lsdb_remove_all(ospf6->lsdb_self);
+	ospf6_route_remove_all(ospf6->route_table);
+	ospf6_route_remove_all(ospf6->brouter_table);
+}
+
+static void ospf6_process_reset(struct ospf6 *ospf6)
+{
+	struct interface *ifp;
+	struct vrf *vrf = vrf_lookup_by_id(ospf6->vrf_id);
+
+	ospf6_unset_all_aggr_flag(ospf6);
+	ospf6_flush_self_originated_lsas_now(ospf6);
+	ospf6->inst_shutdown = 0;
+	ospf6_db_clear(ospf6);
+
+	ospf6_asbr_redistribute_reset(ospf6);
+	FOR_ALL_INTERFACES (vrf, ifp)
+		ospf6_interface_clear(ifp);
+}
+
+DEFPY (clear_router_ospf6,
+       clear_router_ospf6_cmd,
+       "clear ipv6 ospf6 process [vrf NAME$name]",
+       CLEAR_STR
+       IP6_STR
+       OSPF6_STR
+       "Reset OSPF Process\n"
+       VRF_CMD_HELP_STR)
+{
+	struct ospf6 *ospf6;
+	const char *vrf_name = VRF_DEFAULT_NAME;
+
+	if (name != NULL)
+		vrf_name = name;
+
+	ospf6 = ospf6_lookup_by_vrf_name(vrf_name);
+	if (ospf6 == NULL) {
+		vty_out(vty, "OSPFv3 is not configured\n");
+	} else {
+		ospf6_router_id_update(ospf6, true);
+		ospf6_process_reset(ospf6);
+	}
+
+	return CMD_SUCCESS;
+}
+
+/* change Router_ID commands. */
+DEFUN(ospf6_router_id,
+      ospf6_router_id_cmd,
+      "ospf6 router-id A.B.C.D",
+      OSPF6_STR
+      "Configure OSPF6 Router-ID\n"
+      V4NOTATION_STR)
+{
+	VTY_DECLVAR_CONTEXT(ospf6, o);
+	int idx = 0;
+	int ret;
+	const char *router_id_str;
+	uint32_t router_id;
+
+	argv_find(argv, argc, "A.B.C.D", &idx);
+	router_id_str = argv[idx]->arg;
+
+	ret = inet_pton(AF_INET, router_id_str, &router_id);
+	if (ret == 0) {
+		vty_out(vty, "malformed OSPF Router-ID: %s\n", router_id_str);
+		return CMD_SUCCESS;
+	}
+
+	o->router_id_static = router_id;
+
+	if (ospf6_router_id_update(o, false))
+		ospf6_process_reset(o);
+	else
+		vty_out(vty,
+			"For this router-id change to take effect run the \"clear ipv6 ospf6 process\" command\n");
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_ospf6_router_id,
+      no_ospf6_router_id_cmd,
+      "no ospf6 router-id [A.B.C.D]",
+      NO_STR OSPF6_STR
+      "Configure OSPF6 Router-ID\n"
+      V4NOTATION_STR)
+{
+	VTY_DECLVAR_CONTEXT(ospf6, o);
+
+	o->router_id_static = 0;
+
+
+	if (ospf6_router_id_update(o, false))
+		ospf6_process_reset(o);
+	else
+		vty_out(vty,
+			"For this router-id change to take effect run the \"clear ipv6 ospf6 process\" command\n");
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (ospf6_log_adjacency_changes,
+       ospf6_log_adjacency_changes_cmd,
+       "log-adjacency-changes",
+       "Log changes in adjacency state\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	SET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_CHANGES);
+	UNSET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_DETAIL);
+	return CMD_SUCCESS;
+}
+
+DEFUN (ospf6_log_adjacency_changes_detail,
+       ospf6_log_adjacency_changes_detail_cmd,
+       "log-adjacency-changes detail",
+       "Log changes in adjacency state\n"
+       "Log all state changes\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	SET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_CHANGES);
+	SET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_DETAIL);
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ospf6_log_adjacency_changes,
+       no_ospf6_log_adjacency_changes_cmd,
+       "no log-adjacency-changes",
+       NO_STR
+       "Log changes in adjacency state\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	UNSET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_DETAIL);
+	UNSET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_CHANGES);
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ospf6_log_adjacency_changes_detail,
+       no_ospf6_log_adjacency_changes_detail_cmd,
+       "no log-adjacency-changes detail",
+       NO_STR
+       "Log changes in adjacency state\n"
+       "Log all state changes\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	UNSET_FLAG(ospf6->config_flags, OSPF6_LOG_ADJACENCY_DETAIL);
+	return CMD_SUCCESS;
+}
+
+static void ospf6_reinstall_routes(struct ospf6 *ospf6)
+{
+	struct ospf6_route *route;
+
+	for (route = ospf6_route_head(ospf6->route_table); route;
+	     route = ospf6_route_next(route))
+		ospf6_zebra_route_update_add(route, ospf6);
+}
+
+DEFPY (ospf6_send_extra_data,
+       ospf6_send_extra_data_cmd,
+       "[no] ospf6 send-extra-data zebra",
+       NO_STR
+       OSPF6_STR
+       "Extra data to Zebra for display/use\n"
+       "To zebra\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	if (no
+	    && CHECK_FLAG(ospf6->config_flags,
+			  OSPF6_SEND_EXTRA_DATA_TO_ZEBRA)) {
+		UNSET_FLAG(ospf6->config_flags, OSPF6_SEND_EXTRA_DATA_TO_ZEBRA);
+		ospf6_reinstall_routes(ospf6);
+	} else if (!CHECK_FLAG(ospf6->config_flags,
+			       OSPF6_SEND_EXTRA_DATA_TO_ZEBRA)) {
+		SET_FLAG(ospf6->config_flags, OSPF6_SEND_EXTRA_DATA_TO_ZEBRA);
+		ospf6_reinstall_routes(ospf6);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (ospf6_timers_lsa,
+       ospf6_timers_lsa_cmd,
+       "timers lsa min-arrival (0-600000)",
+       "Adjust routing timers\n"
+       "OSPF6 LSA timers\n"
+       "Minimum delay in receiving new version of a LSA\n"
+       "Delay in milliseconds\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf);
+	int idx_number = 3;
+	unsigned int minarrival;
+
+	minarrival = strtoul(argv[idx_number]->arg, NULL, 10);
+	ospf->lsa_minarrival = minarrival;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ospf6_timers_lsa,
+       no_ospf6_timers_lsa_cmd,
+       "no timers lsa min-arrival [(0-600000)]",
+       NO_STR
+       "Adjust routing timers\n"
+       "OSPF6 LSA timers\n"
+       "Minimum delay in receiving new version of a LSA\n"
+       "Delay in milliseconds\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf);
+	int idx_number = 4;
+	unsigned int minarrival;
+
+	if (argc == 5) {
+		minarrival = strtoul(argv[idx_number]->arg, NULL, 10);
+
+		if (ospf->lsa_minarrival != minarrival
+		    || minarrival == OSPF_MIN_LS_ARRIVAL)
+			return CMD_SUCCESS;
+	}
+
+	ospf->lsa_minarrival = OSPF_MIN_LS_ARRIVAL;
+
+	return CMD_SUCCESS;
+}
+
+
+DEFUN (ospf6_distance,
+       ospf6_distance_cmd,
+       "distance (1-255)",
+       "Administrative distance\n"
+       "OSPF6 Administrative distance\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, o);
+	uint8_t distance;
+
+	distance = atoi(argv[1]->arg);
+	if (o->distance_all != distance) {
+		o->distance_all = distance;
+		ospf6_restart_spf(o);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ospf6_distance,
+       no_ospf6_distance_cmd,
+       "no distance (1-255)",
+       NO_STR
+       "Administrative distance\n"
+       "OSPF6 Administrative distance\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, o);
+
+	if (o->distance_all) {
+		o->distance_all = 0;
+		ospf6_restart_spf(o);
+	}
+	return CMD_SUCCESS;
+}
+
+DEFUN (ospf6_distance_ospf6,
+       ospf6_distance_ospf6_cmd,
+       "distance ospf6 {intra-area (1-255)|inter-area (1-255)|external (1-255)}",
+       "Administrative distance\n"
+       "OSPF6 administrative distance\n"
+       "Intra-area routes\n"
+       "Distance for intra-area routes\n"
+       "Inter-area routes\n"
+       "Distance for inter-area routes\n"
+       "External routes\n"
+       "Distance for external routes\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, o);
+	int idx = 0;
+
+	o->distance_intra = 0;
+	o->distance_inter = 0;
+	o->distance_external = 0;
+
+	if (argv_find(argv, argc, "intra-area", &idx))
+		o->distance_intra = atoi(argv[idx + 1]->arg);
+	idx = 0;
+	if (argv_find(argv, argc, "inter-area", &idx))
+		o->distance_inter = atoi(argv[idx + 1]->arg);
+	idx = 0;
+	if (argv_find(argv, argc, "external", &idx))
+		o->distance_external = atoi(argv[idx + 1]->arg);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ospf6_distance_ospf6,
+       no_ospf6_distance_ospf6_cmd,
+       "no distance ospf6 [{intra-area [(1-255)]|inter-area [(1-255)]|external [(1-255)]}]",
+       NO_STR
+       "Administrative distance\n"
+       "OSPF6 distance\n"
+       "Intra-area routes\n"
+       "Distance for intra-area routes\n"
+       "Inter-area routes\n"
+       "Distance for inter-area routes\n"
+       "External routes\n"
+       "Distance for external routes\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, o);
+	int idx = 0;
+
+	if (argv_find(argv, argc, "intra-area", &idx) || argc == 3)
+		idx = o->distance_intra = 0;
+	if (argv_find(argv, argc, "inter-area", &idx) || argc == 3)
+		idx = o->distance_inter = 0;
+	if (argv_find(argv, argc, "external", &idx) || argc == 3)
+		o->distance_external = 0;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN_HIDDEN (ospf6_interface_area,
+       ospf6_interface_area_cmd,
+       "interface IFNAME area <A.B.C.D|(0-4294967295)>",
+       "Enable routing on an IPv6 interface\n"
+       IFNAME_STR
+       "Specify the OSPF6 area ID\n"
+       "OSPF6 area ID in IPv4 address notation\n"
+       "OSPF6 area ID in decimal notation\n"
+      )
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+	int idx_ifname = 1;
+	int idx_ipv4 = 3;
+	struct ospf6_area *oa;
+	struct ospf6_interface *oi;
+	struct interface *ifp;
+	uint32_t area_id;
+	int format;
+
+	vty_out(vty,
+		"This command is deprecated, because it is not VRF-aware.\n");
+	vty_out(vty,
+		"Please, use \"ipv6 ospf6 area\" on an interface instead.\n");
+
+	/* find/create ospf6 interface */
+	ifp = if_get_by_name(argv[idx_ifname]->arg, ospf6->vrf_id, ospf6->name);
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	if (oi->area) {
+		vty_out(vty, "%s already attached to Area %s\n",
+			oi->interface->name, oi->area->name);
+		return CMD_SUCCESS;
+	}
+
+	if (str2area_id(argv[idx_ipv4]->arg, &area_id, &format)) {
+		vty_out(vty, "Malformed Area-ID: %s\n", argv[idx_ipv4]->arg);
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	oi->area_id = area_id;
+	oi->area_id_format = format;
+
+	oa = ospf6_area_lookup(area_id, ospf6);
+	if (oa == NULL)
+		oa = ospf6_area_create(area_id, ospf6, format);
+
+	/* attach interface to area */
+	listnode_add(oa->if_list, oi); /* sort ?? */
+	oi->area = oa;
+
+	SET_FLAG(oa->flag, OSPF6_AREA_ENABLE);
+
+	/* ospf6 process is currently disabled, not much more to do */
+	if (CHECK_FLAG(ospf6->flag, OSPF6_DISABLED))
+		return CMD_SUCCESS;
+
+	/* start up */
+	ospf6_interface_enable(oi);
+
+	/* If the router is ABR, originate summary routes */
+	if (ospf6_check_and_set_router_abr(ospf6)) {
+		ospf6_abr_enable_area(oa);
+		ospf6_schedule_abr_task(oa->ospf6);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN_HIDDEN (no_ospf6_interface_area,
+       no_ospf6_interface_area_cmd,
+       "no interface IFNAME area <A.B.C.D|(0-4294967295)>",
+       NO_STR
+       "Disable routing on an IPv6 interface\n"
+       IFNAME_STR
+       "Specify the OSPF6 area ID\n"
+       "OSPF6 area ID in IPv4 address notation\n"
+       "OSPF6 area ID in decimal notation\n"
+       )
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+	int idx_ifname = 2;
+	int idx_ipv4 = 4;
+	struct ospf6_interface *oi;
+	struct ospf6_area *oa;
+	struct interface *ifp;
+	uint32_t area_id;
+
+	vty_out(vty,
+		"This command is deprecated, because it is not VRF-aware.\n");
+	vty_out(vty,
+		"Please, use \"no ipv6 ospf6 area\" on an interface instead.\n");
+
+	/* find/create ospf6 interface */
+	ifp = if_get_by_name(argv[idx_ifname]->arg, ospf6->vrf_id, ospf6->name);
+
+	if (ifp == NULL) {
+		vty_out(vty, "No such interface %s\n", argv[idx_ifname]->arg);
+		return CMD_SUCCESS;
+	}
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL) {
+		vty_out(vty, "Interface %s not enabled\n", ifp->name);
+		return CMD_SUCCESS;
+	}
+
+	/* parse Area-ID */
+	if (inet_pton(AF_INET, argv[idx_ipv4]->arg, &area_id) != 1)
+		area_id = htonl(strtoul(argv[idx_ipv4]->arg, NULL, 10));
+
+	/* Verify Area */
+	if (oi->area == NULL) {
+		vty_out(vty, "%s not attached to area %s\n",
+			oi->interface->name, argv[idx_ipv4]->arg);
+		return CMD_SUCCESS;
+	}
+
+	if (oi->area->area_id != area_id) {
+		vty_out(vty, "Wrong Area-ID: %s is attached to area %s\n",
+			oi->interface->name, oi->area->name);
+		return CMD_SUCCESS;
+	}
+
+	ospf6_interface_disable(oi);
+
+	oa = oi->area;
+	listnode_delete(oi->area->if_list, oi);
+	oi->area = (struct ospf6_area *)NULL;
+
+	/* Withdraw inter-area routes from this area, if necessary */
+	if (oa->if_list->count == 0) {
+		UNSET_FLAG(oa->flag, OSPF6_AREA_ENABLE);
+		ospf6_abr_disable_area(oa);
+	}
+
+	oi->area_id = 0;
+	oi->area_id_format = OSPF6_AREA_FMT_UNSET;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (ospf6_stub_router_admin,
+       ospf6_stub_router_admin_cmd,
+       "stub-router administrative",
+       "Make router a stub router\n"
+       "Administratively applied, for an indefinite period\n")
+{
+	struct listnode *node;
+	struct ospf6_area *oa;
+
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	if (!CHECK_FLAG(ospf6->flag, OSPF6_STUB_ROUTER)) {
+		for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, node, oa)) {
+			OSPF6_OPT_CLEAR(oa->options, OSPF6_OPT_V6);
+			OSPF6_OPT_CLEAR(oa->options, OSPF6_OPT_R);
+			OSPF6_ROUTER_LSA_SCHEDULE(oa);
+		}
+		SET_FLAG(ospf6->flag, OSPF6_STUB_ROUTER);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ospf6_stub_router_admin,
+       no_ospf6_stub_router_admin_cmd,
+       "no stub-router administrative",
+       NO_STR
+       "Make router a stub router\n"
+       "Administratively applied, for an indefinite period\n")
+{
+	struct listnode *node;
+	struct ospf6_area *oa;
+
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+	if (CHECK_FLAG(ospf6->flag, OSPF6_STUB_ROUTER)) {
+		for (ALL_LIST_ELEMENTS_RO(ospf6->area_list, node, oa)) {
+			OSPF6_OPT_SET(oa->options, OSPF6_OPT_V6);
+			OSPF6_OPT_SET(oa->options, OSPF6_OPT_R);
+			OSPF6_ROUTER_LSA_SCHEDULE(oa);
+		}
+		UNSET_FLAG(ospf6->flag, OSPF6_STUB_ROUTER);
+	}
+
+	return CMD_SUCCESS;
+}
+
+/* Restart OSPF SPF algorithm*/
+void ospf6_restart_spf(struct ospf6 *ospf6)
+{
+	ospf6_route_remove_all(ospf6->route_table);
+	ospf6_route_remove_all(ospf6->brouter_table);
+
+	/* Trigger SPF */
+	ospf6_spf_schedule(ospf6, OSPF6_SPF_FLAGS_CONFIG_CHANGE);
+}
+
+/* Set the max paths */
+static void ospf6_maxpath_set(struct ospf6 *ospf6, uint16_t paths)
+{
+	if (ospf6->max_multipath == paths)
+		return;
+
+	ospf6->max_multipath = paths;
+
+	/* Send deletion to zebra to delete all
+	 * ospf specific routes and reinitiate
+	 * SPF to reflect the new max multipath.
+	 */
+	ospf6_restart_spf(ospf6);
+}
+
+/* Ospf Maximum-paths config support */
+DEFUN(ospf6_max_multipath,
+      ospf6_max_multipath_cmd,
+      "maximum-paths " CMD_RANGE_STR(1, MULTIPATH_NUM),
+      "Max no of multiple paths for ECMP support\n"
+      "Number of paths\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+	int idx_number = 1;
+	int maximum_paths = strtol(argv[idx_number]->arg, NULL, 10);
+
+	ospf6_maxpath_set(ospf6, maximum_paths);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_ospf6_max_multipath,
+      no_ospf6_max_multipath_cmd,
+     "no maximum-paths [" CMD_RANGE_STR(1, MULTIPATH_NUM)"]",
+      NO_STR
+      "Max no of multiple paths for ECMP support\n"
+      "Number of paths\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	ospf6_maxpath_set(ospf6, MULTIPATH_NUM);
+
+	return CMD_SUCCESS;
+}
+
+static void ospf6_show(struct vty *vty, struct ospf6 *o, json_object *json,
+		       bool use_json)
+{
+	struct listnode *n;
+	struct ospf6_area *oa;
+	char router_id[16], duration[32];
+	struct timeval now, running, result;
+	char buf[32], rbuf[32];
+	json_object *json_areas = NULL;
+	const char *adjacency;
+
+	if (use_json) {
+		json_areas = json_object_new_object();
+
+		/* process id, router id */
+		inet_ntop(AF_INET, &o->router_id, router_id, sizeof(router_id));
+		json_object_string_add(json, "routerId", router_id);
+
+		/* running time */
+		monotime(&now);
+		timersub(&now, &o->starttime, &running);
+		timerstring(&running, duration, sizeof(duration));
+		json_object_string_add(json, "running", duration);
+
+		/* Redistribute configuration */
+		/* XXX */
+		json_object_int_add(json, "lsaMinimumArrivalMsecs",
+				    o->lsa_minarrival);
+
+		/* Show SPF parameters */
+		json_object_int_add(json, "spfScheduleDelayMsecs",
+				    o->spf_delay);
+		json_object_int_add(json, "holdTimeMinMsecs", o->spf_holdtime);
+		json_object_int_add(json, "holdTimeMaxMsecs",
+				    o->spf_max_holdtime);
+		json_object_int_add(json, "holdTimeMultiplier",
+				    o->spf_hold_multiplier);
+
+		json_object_int_add(json, "maximumPaths", o->max_multipath);
+		json_object_int_add(json, "preference",
+				    o->distance_all
+					    ? o->distance_all
+					    : ZEBRA_OSPF6_DISTANCE_DEFAULT);
+
+		if (o->ts_spf.tv_sec || o->ts_spf.tv_usec) {
+			timersub(&now, &o->ts_spf, &result);
+			timerstring(&result, buf, sizeof(buf));
+			ospf6_spf_reason_string(o->last_spf_reason, rbuf,
+						sizeof(rbuf));
+			json_object_boolean_true_add(json, "spfHasRun");
+			json_object_string_add(json, "spfLastExecutedMsecs",
+					       buf);
+			json_object_string_add(json, "spfLastExecutedReason",
+					       rbuf);
+
+			json_object_int_add(
+				json, "spfLastDurationSecs",
+				(long long)o->ts_spf_duration.tv_sec);
+
+			json_object_int_add(
+				json, "spfLastDurationMsecs",
+				(long long)o->ts_spf_duration.tv_usec);
+		} else
+			json_object_boolean_false_add(json, "spfHasRun");
+
+		if (event_is_scheduled(o->t_spf_calc)) {
+			long time_store;
+
+			json_object_boolean_true_add(json, "spfTimerActive");
+			time_store =
+				monotime_until(&o->t_spf_calc->u.sands, NULL)
+				/ 1000LL;
+			json_object_int_add(json, "spfTimerDueInMsecs",
+					    time_store);
+		} else
+			json_object_boolean_false_add(json, "spfTimerActive");
+
+		json_object_boolean_add(json, "routerIsStubRouter",
+					CHECK_FLAG(o->flag, OSPF6_STUB_ROUTER));
+
+		/* LSAs */
+		json_object_int_add(json, "numberOfAsScopedLsa",
+				    o->lsdb->count);
+		/* Areas */
+		json_object_int_add(json, "numberOfAreaInRouter",
+				    listcount(o->area_list));
+
+		json_object_int_add(json, "AuthTrailerHigherSeqNo",
+				    o->seqnum_h);
+		json_object_int_add(json, "AuthTrailerLowerSeqNo", o->seqnum_l);
+
+		if (CHECK_FLAG(o->config_flags, OSPF6_LOG_ADJACENCY_CHANGES)) {
+			if (CHECK_FLAG(o->config_flags,
+				       OSPF6_LOG_ADJACENCY_DETAIL))
+				adjacency = "LoggedAll";
+			else
+				adjacency = "Logged";
+		} else
+			adjacency = "NotLogged";
+		json_object_string_add(json, "adjacencyChanges", adjacency);
+
+		for (ALL_LIST_ELEMENTS_RO(o->area_list, n, oa))
+			ospf6_area_show(vty, oa, json_areas, use_json);
+
+		json_object_object_add(json, "areas", json_areas);
+
+		vty_out(vty, "%s\n",
+			json_object_to_json_string_ext(
+				json, JSON_C_TO_STRING_PRETTY));
+
+	} else {
+		/* process id, router id */
+		inet_ntop(AF_INET, &o->router_id, router_id, sizeof(router_id));
+		vty_out(vty, " OSPFv3 Routing Process (0) with Router-ID %s\n",
+			router_id);
+
+		/* running time */
+		monotime(&now);
+		timersub(&now, &o->starttime, &running);
+		timerstring(&running, duration, sizeof(duration));
+		vty_out(vty, " Running %s\n", duration);
+
+		/* Redistribute configuration */
+		/* XXX */
+		vty_out(vty, " LSA minimum arrival %d msecs\n",
+			o->lsa_minarrival);
+
+		vty_out(vty, " Maximum-paths %u\n", o->max_multipath);
+		vty_out(vty, " Administrative distance %u\n",
+			o->distance_all ? o->distance_all
+					: ZEBRA_OSPF6_DISTANCE_DEFAULT);
+
+		/* Show SPF parameters */
+		vty_out(vty,
+			" Initial SPF scheduling delay %d millisec(s)\n"
+			" Minimum hold time between consecutive SPFs %d millsecond(s)\n"
+			" Maximum hold time between consecutive SPFs %d millsecond(s)\n"
+			" Hold time multiplier is currently %d\n",
+			o->spf_delay, o->spf_holdtime, o->spf_max_holdtime,
+			o->spf_hold_multiplier);
+
+
+		vty_out(vty, " SPF algorithm ");
+		if (o->ts_spf.tv_sec || o->ts_spf.tv_usec) {
+			timersub(&now, &o->ts_spf, &result);
+			timerstring(&result, buf, sizeof(buf));
+			ospf6_spf_reason_string(o->last_spf_reason, rbuf,
+						sizeof(rbuf));
+			vty_out(vty, "last executed %s ago, reason %s\n", buf,
+				rbuf);
+			vty_out(vty, " Last SPF duration %lld sec %lld usec\n",
+				(long long)o->ts_spf_duration.tv_sec,
+				(long long)o->ts_spf_duration.tv_usec);
+		} else
+			vty_out(vty, "has not been run\n");
+
+		threadtimer_string(now, o->t_spf_calc, buf, sizeof(buf));
+		vty_out(vty, " SPF timer %s%s\n",
+			(event_is_scheduled(o->t_spf_calc) ? "due in " : "is "),
+			buf);
+
+		if (CHECK_FLAG(o->flag, OSPF6_STUB_ROUTER))
+			vty_out(vty, " Router Is Stub Router\n");
+
+		/* LSAs */
+		vty_out(vty, " Number of AS scoped LSAs is %u\n",
+			o->lsdb->count);
+
+		/* Areas */
+		vty_out(vty, " Number of areas in this router is %u\n",
+			listcount(o->area_list));
+
+		vty_out(vty, " Authentication Sequence number info\n");
+		vty_out(vty, "  Higher sequence no %u, Lower sequence no %u\n",
+			o->seqnum_h, o->seqnum_l);
+
+		if (CHECK_FLAG(o->config_flags, OSPF6_LOG_ADJACENCY_CHANGES)) {
+			if (CHECK_FLAG(o->config_flags,
+				       OSPF6_LOG_ADJACENCY_DETAIL))
+				vty_out(vty,
+					" All adjacency changes are logged\n");
+			else
+				vty_out(vty, " Adjacency changes are logged\n");
+		}
+
+
+		vty_out(vty, "\n");
+
+		for (ALL_LIST_ELEMENTS_RO(o->area_list, n, oa))
+			ospf6_area_show(vty, oa, json_areas, use_json);
+	}
+}
+
+DEFUN(show_ipv6_ospf6_vrfs, show_ipv6_ospf6_vrfs_cmd,
+      "show ipv6 ospf6 vrfs [json]",
+      SHOW_STR IP6_STR OSPF6_STR "Show OSPF6 VRFs \n" JSON_STR)
+{
+	bool uj = use_json(argc, argv);
+	json_object *json = NULL;
+	json_object *json_vrfs = NULL;
+	struct ospf6 *ospf6 = NULL;
+	struct listnode *node = NULL;
+	int count = 0;
+	char buf[PREFIX_STRLEN];
+	static const char header[] =
+		"Name                       Id     RouterId  ";
+
+	if (uj) {
+		json = json_object_new_object();
+		json_vrfs = json_object_new_object();
+	}
+
+	for (ALL_LIST_ELEMENTS_RO(om6->ospf6, node, ospf6)) {
+		json_object *json_vrf = NULL;
+		const char *name = NULL;
+		int64_t vrf_id_ui = 0;
+		struct in_addr router_id;
+
+		router_id.s_addr = ospf6->router_id;
+		count++;
+
+		if (!uj && count == 1)
+			vty_out(vty, "%s\n", header);
+		if (uj)
+			json_vrf = json_object_new_object();
+
+		if (ospf6->vrf_id == VRF_DEFAULT)
+			name = VRF_DEFAULT_NAME;
+		else
+			name = ospf6->name;
+
+		vrf_id_ui = (ospf6->vrf_id == VRF_UNKNOWN)
+				    ? -1
+				    : (int64_t)ospf6->vrf_id;
+
+		if (uj) {
+			json_object_int_add(json_vrf, "vrfId", vrf_id_ui);
+			json_object_string_addf(json_vrf, "routerId", "%pI4",
+						&router_id);
+			json_object_object_add(json_vrfs, name, json_vrf);
+
+		} else {
+			vty_out(vty, "%-25s  %-5d  %-16s  \n", name,
+				ospf6->vrf_id,
+				inet_ntop(AF_INET, &router_id, buf,
+					  sizeof(buf)));
+		}
+	}
+
+	if (uj) {
+		json_object_object_add(json, "vrfs", json_vrfs);
+		json_object_int_add(json, "totalVrfs", count);
+
+		vty_json(vty, json);
+	} else {
+		if (count)
+			vty_out(vty, "\nTotal number of OSPF VRFs: %d\n",
+				count);
+	}
+
+	return CMD_SUCCESS;
+}
+
+/* show top level structures */
+DEFUN(show_ipv6_ospf6, show_ipv6_ospf6_cmd,
+      "show ipv6 ospf6 [vrf <NAME|all>] [json]",
+      SHOW_STR IP6_STR OSPF6_STR VRF_CMD_HELP_STR "All VRFs\n" JSON_STR)
+{
+	struct ospf6 *ospf6;
+	struct listnode *node;
+	const char *vrf_name = NULL;
+	bool all_vrf = false;
+	int idx_vrf = 0;
+
+	bool uj = use_json(argc, argv);
+	json_object *json = NULL;
+
+	OSPF6_FIND_VRF_ARGS(argv, argc, idx_vrf, vrf_name, all_vrf);
+
+	for (ALL_LIST_ELEMENTS_RO(om6->ospf6, node, ospf6)) {
+		if (all_vrf || strcmp(ospf6->name, vrf_name) == 0) {
+			if (uj)
+				json = json_object_new_object();
+			ospf6_show(vty, ospf6, json, uj);
+
+			if (!all_vrf)
+				break;
+		}
+	}
+
+	if (uj)
+		json_object_free(json);
+
+	OSPF6_CMD_CHECK_VRF(uj, all_vrf, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(show_ipv6_ospf6_route, show_ipv6_ospf6_route_cmd,
+      "show ipv6 ospf6 [vrf <NAME|all>] route [<intra-area|inter-area|external-1|external-2|X:X::X:X|X:X::X:X/M|detail|summary>] [json]",
+      SHOW_STR IP6_STR OSPF6_STR VRF_CMD_HELP_STR
+      "All VRFs\n" ROUTE_STR
+      "Display Intra-Area routes\n"
+      "Display Inter-Area routes\n"
+      "Display Type-1 External routes\n"
+      "Display Type-2 External routes\n"
+      "Specify IPv6 address\n"
+      "Specify IPv6 prefix\n"
+      "Detailed information\n"
+      "Summary of route table\n" JSON_STR)
+{
+	struct ospf6 *ospf6;
+	struct listnode *node;
+	const char *vrf_name = NULL;
+	bool all_vrf = false;
+	int idx_vrf = 0;
+	int idx_arg_start = 4;
+	bool uj = use_json(argc, argv);
+
+	OSPF6_FIND_VRF_ARGS(argv, argc, idx_vrf, vrf_name, all_vrf);
+	if (idx_vrf > 0)
+		idx_arg_start += 2;
+
+	for (ALL_LIST_ELEMENTS_RO(om6->ospf6, node, ospf6)) {
+		if (all_vrf || strcmp(ospf6->name, vrf_name) == 0) {
+			ospf6_route_table_show(vty, idx_arg_start, argc, argv,
+					       ospf6->route_table, uj);
+
+			if (!all_vrf)
+				break;
+		}
+	}
+
+	OSPF6_CMD_CHECK_VRF(uj, all_vrf, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(show_ipv6_ospf6_route_match, show_ipv6_ospf6_route_match_cmd,
+      "show ipv6 ospf6 [vrf <NAME|all>] route X:X::X:X/M <match|longer> [json]",
+      SHOW_STR IP6_STR OSPF6_STR VRF_CMD_HELP_STR
+      "All VRFs\n" ROUTE_STR
+      "Specify IPv6 prefix\n"
+      "Display routes which match the specified route\n"
+      "Display routes longer than the specified route\n" JSON_STR)
+{
+	struct ospf6 *ospf6;
+	struct listnode *node;
+	const char *vrf_name = NULL;
+	bool all_vrf = false;
+	int idx_vrf = 0;
+	int idx_start_arg = 4;
+	bool uj = use_json(argc, argv);
+
+	OSPF6_FIND_VRF_ARGS(argv, argc, idx_vrf, vrf_name, all_vrf);
+	if (idx_vrf > 0)
+		idx_start_arg += 2;
+
+	for (ALL_LIST_ELEMENTS_RO(om6->ospf6, node, ospf6)) {
+		if (all_vrf || strcmp(ospf6->name, vrf_name) == 0) {
+			ospf6_route_table_show(vty, idx_start_arg, argc, argv,
+					       ospf6->route_table, uj);
+
+			if (!all_vrf)
+				break;
+		}
+	}
+
+	OSPF6_CMD_CHECK_VRF(uj, all_vrf, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(show_ipv6_ospf6_route_match_detail,
+      show_ipv6_ospf6_route_match_detail_cmd,
+      "show ipv6 ospf6 [vrf <NAME|all>] route X:X::X:X/M match detail [json]",
+      SHOW_STR IP6_STR OSPF6_STR VRF_CMD_HELP_STR
+      "All VRFs\n" ROUTE_STR
+      "Specify IPv6 prefix\n"
+      "Display routes which match the specified route\n"
+      "Detailed information\n" JSON_STR)
+{
+	struct ospf6 *ospf6;
+	struct listnode *node;
+	const char *vrf_name = NULL;
+	bool all_vrf = false;
+	int idx_vrf = 0;
+	int idx_start_arg = 4;
+	bool uj = use_json(argc, argv);
+
+	OSPF6_FIND_VRF_ARGS(argv, argc, idx_vrf, vrf_name, all_vrf);
+	if (idx_vrf > 0)
+		idx_start_arg += 2;
+
+	for (ALL_LIST_ELEMENTS_RO(om6->ospf6, node, ospf6)) {
+		if (all_vrf || strcmp(ospf6->name, vrf_name) == 0) {
+			ospf6_route_table_show(vty, idx_start_arg, argc, argv,
+					       ospf6->route_table, uj);
+
+			if (!all_vrf)
+				break;
+		}
+	}
+
+	OSPF6_CMD_CHECK_VRF(uj, all_vrf, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(show_ipv6_ospf6_route_type_detail, show_ipv6_ospf6_route_type_detail_cmd,
+      "show ipv6 ospf6 [vrf <NAME|all>] route <intra-area|inter-area|external-1|external-2> detail [json]",
+      SHOW_STR IP6_STR OSPF6_STR VRF_CMD_HELP_STR
+      "All VRFs\n" ROUTE_STR
+      "Display Intra-Area routes\n"
+      "Display Inter-Area routes\n"
+      "Display Type-1 External routes\n"
+      "Display Type-2 External routes\n"
+      "Detailed information\n" JSON_STR)
+{
+	struct ospf6 *ospf6;
+	struct listnode *node;
+	const char *vrf_name = NULL;
+	bool all_vrf = false;
+	int idx_vrf = 0;
+	int idx_start_arg = 4;
+	bool uj = use_json(argc, argv);
+
+	OSPF6_FIND_VRF_ARGS(argv, argc, idx_vrf, vrf_name, all_vrf);
+	if (idx_vrf > 0)
+		idx_start_arg += 2;
+
+	for (ALL_LIST_ELEMENTS_RO(om6->ospf6, node, ospf6)) {
+		if (all_vrf || strcmp(ospf6->name, vrf_name) == 0) {
+			ospf6_route_table_show(vty, idx_start_arg, argc, argv,
+					       ospf6->route_table, uj);
+
+			if (!all_vrf)
+				break;
+		}
+	}
+
+	OSPF6_CMD_CHECK_VRF(uj, all_vrf, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+bool ospf6_is_valid_summary_addr(struct vty *vty, struct prefix *p)
+{
+	/* Default prefix validation*/
+	if (is_default_prefix(p)) {
+		vty_out(vty,
+			"Default address should not be configured as summary address.\n");
+		return false;
+	}
+
+	/* Host route should not be configured as summary address */
+	if (p->prefixlen == IPV6_MAX_BITLEN) {
+		vty_out(vty, "Host route should not be configured as summary address.\n");
+		return false;
+	}
+
+	return true;
+}
+
+/* External Route Aggregation */
+DEFPY (ospf6_external_route_aggregation,
+       ospf6_external_route_aggregation_cmd,
+       "summary-address X:X::X:X/M$prefix [tag (1-4294967295)] [{metric (0-16777215) | metric-type (1-2)$mtype}]",
+       "External summary address\n"
+       "Specify IPv6 prefix\n"
+       "Router tag \n"
+       "Router tag value\n"
+       "Metric \n"
+       "Advertised metric for this route\n"
+       "OSPFv3 exterior metric type for summarised routes\n"
+       "Set OSPFv3 External Type 1/2 metrics\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	struct prefix p;
+	int ret = CMD_SUCCESS;
+
+	p.family = AF_INET6;
+	ret = str2prefix(prefix_str, &p);
+	if (ret == 0) {
+		vty_out(vty, "Malformed prefix\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* Apply mask for given prefix. */
+	apply_mask(&p);
+
+	if (!ospf6_is_valid_summary_addr(vty, &p))
+		return CMD_WARNING_CONFIG_FAILED;
+
+	if (!tag_str)
+		tag = 0;
+
+	if (!metric_str)
+		metric = -1;
+
+	if (!mtype_str)
+		mtype = DEFAULT_METRIC_TYPE;
+
+	ret = ospf6_external_aggr_config_set(ospf6, &p, tag, metric, mtype);
+	if (ret == OSPF6_FAILURE) {
+		vty_out(vty, "Invalid configuration!!\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFPY(no_ospf6_external_route_aggregation,
+      no_ospf6_external_route_aggregation_cmd,
+      "no summary-address X:X::X:X/M$prefix [tag (1-4294967295)] [{metric (0-16777215) | metric-type (1-2)}]",
+      NO_STR
+      "External summary address\n"
+      "Specify IPv6 prefix\n"
+      "Router tag\n"
+      "Router tag value\n"
+      "Metric \n"
+      "Advertised metric for this route\n"
+      "OSPFv3 exterior metric type for summarised routes\n"
+      "Set OSPFv3 External Type 1/2 metrics\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	struct prefix p;
+	int ret = CMD_SUCCESS;
+
+	ret = str2prefix(prefix_str, &p);
+	if (ret == 0) {
+		vty_out(vty, "Malformed prefix\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* Apply mask for given prefix. */
+	apply_mask(&p);
+
+	if (!ospf6_is_valid_summary_addr(vty, &p))
+		return CMD_WARNING_CONFIG_FAILED;
+
+	ret = ospf6_external_aggr_config_unset(ospf6, &p);
+	if (ret == OSPF6_INVALID)
+		vty_out(vty, "Invalid configuration!!\n");
+
+	return CMD_SUCCESS;
+}
+
+DEFPY (ospf6_external_route_aggregation_no_advertise,
+       ospf6_external_route_aggregation_no_advertise_cmd,
+       "summary-address X:X::X:X/M$prefix no-advertise",
+       "External summary address\n"
+       "Specify IPv6 prefix\n"
+       "Don't advertise summary route \n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	struct prefix p;
+	int ret = CMD_SUCCESS;
+
+	ret = str2prefix(prefix_str, &p);
+	if (ret == 0) {
+		vty_out(vty, "Malformed prefix\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* Apply mask for given prefix. */
+	apply_mask(&p);
+
+	if (!ospf6_is_valid_summary_addr(vty, &p))
+		return CMD_WARNING_CONFIG_FAILED;
+
+	ret = ospf6_asbr_external_rt_no_advertise(ospf6, &p);
+	if (ret == OSPF6_INVALID)
+		vty_out(vty, "!!Invalid configuration\n");
+
+	return CMD_SUCCESS;
+}
+
+DEFPY (no_ospf6_external_route_aggregation_no_advertise,
+       no_ospf6_external_route_aggregation_no_advertise_cmd,
+       "no summary-address X:X::X:X/M$prefix no-advertise",
+       NO_STR
+       "External summary address\n"
+       "Specify IPv6 prefix\n"
+       "Adverise summary route to the AS \n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	struct prefix p;
+	int ret = CMD_SUCCESS;
+
+	ret = str2prefix(prefix_str, &p);
+	if (ret == 0) {
+		vty_out(vty, "Malformed prefix\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* Apply mask for given prefix. */
+	apply_mask(&p);
+
+	if (!ospf6_is_valid_summary_addr(vty, &p))
+		return CMD_WARNING_CONFIG_FAILED;
+
+	ret = ospf6_asbr_external_rt_advertise(ospf6, &p);
+	if (ret == OSPF6_INVALID)
+		vty_out(vty, "!!Invalid configuration\n");
+
+	return CMD_SUCCESS;
+}
+
+DEFPY (ospf6_route_aggregation_timer,
+       ospf6_route_aggregation_timer_cmd,
+       "aggregation timer (5-1800)",
+       "External route aggregation\n"
+       "Delay timer (in seconds)\n"
+       "Timer interval(in seconds)\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	ospf6_external_aggr_delay_timer_set(ospf6, timer);
+
+	return CMD_SUCCESS;
+}
+
+DEFPY (no_ospf6_route_aggregation_timer,
+       no_ospf6_route_aggregation_timer_cmd,
+       "no aggregation timer [5-1800]",
+       NO_STR
+       "External route aggregation\n"
+       "Delay timer\n"
+       "Timer interval(in seconds)\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, ospf6);
+
+	ospf6_external_aggr_delay_timer_set(ospf6,
+			OSPF6_EXTL_AGGR_DEFAULT_DELAY);
+	return CMD_SUCCESS;
+}
+
+static int
+ospf6_print_vty_external_routes_walkcb(struct hash_bucket *bucket, void *arg)
+{
+	struct ospf6_route *rt = bucket->data;
+	struct vty *vty = (struct vty *)arg;
+	static unsigned int count;
+
+	vty_out(vty, "%pFX ", &rt->prefix);
+
+	count++;
+
+	if (count%5 == 0)
+		vty_out(vty, "\n");
+
+	if (OSPF6_EXTERNAL_RT_COUNT(rt->aggr_route) == count)
+		count = 0;
+
+	return HASHWALK_CONTINUE;
+}
+
+static int
+ospf6_print_json_external_routes_walkcb(struct hash_bucket *bucket, void *arg)
+{
+	struct ospf6_route *rt = bucket->data;
+	struct json_object *json = (struct json_object *)arg;
+	char buf[PREFIX2STR_BUFFER];
+	char exnalbuf[20];
+	static unsigned int count;
+
+	prefix2str(&rt->prefix, buf, sizeof(buf));
+
+	snprintf(exnalbuf, sizeof(exnalbuf), "Exnl Addr-%d", count);
+
+	json_object_string_add(json, exnalbuf, buf);
+
+	count++;
+
+	if (OSPF6_EXTERNAL_RT_COUNT(rt->aggr_route) == count)
+		count = 0;
+
+	return HASHWALK_CONTINUE;
+}
+
+static void
+ospf6_show_vrf_name(struct vty *vty, struct ospf6 *ospf6,
+		    json_object *json)
+{
+	if (json) {
+		if (ospf6->vrf_id == VRF_DEFAULT)
+			json_object_string_add(json, "vrfName",
+					       "default");
+		else
+			json_object_string_add(json, "vrfName",
+					       ospf6->name);
+		json_object_int_add(json, "vrfId", ospf6->vrf_id);
+	} else {
+		if (ospf6->vrf_id == VRF_DEFAULT)
+			vty_out(vty, "VRF Name: %s\n", "default");
+		else if (ospf6->name)
+			vty_out(vty, "VRF Name: %s\n", ospf6->name);
+	}
+}
+
+static int
+ospf6_show_summary_address(struct vty *vty, struct ospf6 *ospf6,
+			json_object *json,
+			bool uj, const char *detail)
+{
+	struct route_node *rn;
+	static const char header[] = "Summary-address       Metric-type     Metric     Tag         External_Rt_count\n";
+	json_object *json_vrf = NULL;
+
+	if (!uj) {
+		ospf6_show_vrf_name(vty, ospf6, json_vrf);
+		vty_out(vty, "aggregation delay interval: %u(in seconds)\n\n",
+			ospf6->aggr_delay_interval);
+		vty_out(vty, "%s\n", header);
+	} else {
+		json_vrf = json_object_new_object();
+
+		ospf6_show_vrf_name(vty, ospf6, json_vrf);
+
+		json_object_int_add(json_vrf, "aggregationDelayInterval",
+				    ospf6->aggr_delay_interval);
+	}
+
+
+	for (rn = route_top(ospf6->rt_aggr_tbl); rn; rn = route_next(rn)) {
+		if (!rn->info)
+			continue;
+
+		struct ospf6_external_aggr_rt *aggr = rn->info;
+		json_object *json_aggr = NULL;
+		char buf[PREFIX2STR_BUFFER];
+
+		prefix2str(&aggr->p, buf, sizeof(buf));
+
+		if (uj) {
+
+			json_aggr = json_object_new_object();
+
+			json_object_object_add(json_vrf,
+						buf,
+						json_aggr);
+
+			json_object_string_add(json_aggr, "summaryAddress",
+					       buf);
+
+			json_object_string_add(
+				json_aggr, "metricType",
+				(aggr->mtype == DEFAULT_METRIC_TYPE) ? "E2"
+								     : "E1");
+
+			json_object_int_add(json_aggr, "Metric",
+					   (aggr->metric != -1)
+					    ? aggr->metric
+					    : DEFAULT_DEFAULT_METRIC);
+
+			json_object_int_add(json_aggr, "Tag",
+					    aggr->tag);
+
+			json_object_int_add(json_aggr, "externalRouteCount",
+					    OSPF6_EXTERNAL_RT_COUNT(aggr));
+
+			if (OSPF6_EXTERNAL_RT_COUNT(aggr) && detail) {
+				json_object_int_add(json_aggr, "ID",
+						    aggr->id);
+				json_object_int_add(json_aggr, "Flags",
+						    aggr->aggrflags);
+				hash_walk(aggr->match_extnl_hash,
+					ospf6_print_json_external_routes_walkcb,
+							json_aggr);
+			}
+
+		} else {
+			vty_out(vty, "%-22s", buf);
+
+			(aggr->mtype == DEFAULT_METRIC_TYPE)
+				? vty_out(vty, "%-16s", "E2")
+				: vty_out(vty, "%-16s", "E1");
+			vty_out(vty, "%-11d", (aggr->metric != -1)
+					? aggr->metric
+					: DEFAULT_DEFAULT_METRIC);
+
+			vty_out(vty, "%-12u", aggr->tag);
+
+			vty_out(vty, "%-5ld\n",
+				OSPF6_EXTERNAL_RT_COUNT(aggr));
+
+			if (OSPF6_EXTERNAL_RT_COUNT(aggr) && detail) {
+				vty_out(vty,
+					"Matched External routes:\n");
+				hash_walk(aggr->match_extnl_hash,
+				ospf6_print_vty_external_routes_walkcb,
+							vty);
+				vty_out(vty, "\n");
+			}
+
+			vty_out(vty, "\n");
+		}
+	}
+
+	if (uj)
+		json_object_object_add(json, ospf6->name,
+					json_vrf);
+
+	return CMD_SUCCESS;
+}
+
+DEFPY (show_ipv6_ospf6_external_aggregator,
+       show_ipv6_ospf6_external_aggregator_cmd,
+       "show ipv6 ospf6 [vrf <NAME|all>] summary-address [detail$detail] [json]",
+       SHOW_STR
+       IP6_STR
+       OSPF6_STR
+       VRF_CMD_HELP_STR
+       "All VRFs\n"
+       "Show external summary addresses\n"
+       "detailed information\n"
+       JSON_STR)
+{
+	bool uj = use_json(argc, argv);
+	struct ospf6 *ospf6 = NULL;
+	json_object *json = NULL;
+	const char *vrf_name = NULL;
+	struct listnode *node;
+	bool all_vrf = false;
+	int idx_vrf = 0;
+
+	if (uj)
+		json = json_object_new_object();
+
+	OSPF6_FIND_VRF_ARGS(argv, argc, idx_vrf, vrf_name, all_vrf);
+
+	for (ALL_LIST_ELEMENTS_RO(om6->ospf6, node, ospf6)) {
+		if (all_vrf || strcmp(ospf6->name, vrf_name) == 0) {
+
+			ospf6_show_summary_address(vty, ospf6, json, uj,
+						   detail);
+
+			if (!all_vrf)
+				break;
+		}
+	}
+
+	if (uj) {
+		vty_json(vty, json);
+	}
+
+	OSPF6_CMD_CHECK_VRF(uj, all_vrf, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+static void ospf6_stub_router_config_write(struct vty *vty, struct ospf6 *ospf6)
+{
+	if (CHECK_FLAG(ospf6->flag, OSPF6_STUB_ROUTER))
+		vty_out(vty, " stub-router administrative\n");
+	return;
+}
+
+static int ospf6_distance_config_write(struct vty *vty, struct ospf6 *ospf6)
+{
+	struct route_node *rn;
+	struct ospf6_distance *odistance;
+
+	if (ospf6->distance_all)
+		vty_out(vty, " distance %u\n", ospf6->distance_all);
+
+	if (ospf6->distance_intra || ospf6->distance_inter
+	    || ospf6->distance_external) {
+		vty_out(vty, " distance ospf6");
+
+		if (ospf6->distance_intra)
+			vty_out(vty, " intra-area %u", ospf6->distance_intra);
+		if (ospf6->distance_inter)
+			vty_out(vty, " inter-area %u", ospf6->distance_inter);
+		if (ospf6->distance_external)
+			vty_out(vty, " external %u", ospf6->distance_external);
+
+		vty_out(vty, "\n");
+	}
+
+	for (rn = route_top(ospf6->distance_table); rn; rn = route_next(rn))
+		if ((odistance = rn->info) != NULL)
+			vty_out(vty, " distance %u %pFX %s\n",
+				odistance->distance, &rn->p,
+				odistance->access_list ? odistance->access_list
+						       : "");
+	return 0;
+}
+
+static int ospf6_asbr_summary_config_write(struct vty *vty, struct ospf6 *ospf6)
+{
+	struct route_node *rn;
+	struct ospf6_external_aggr_rt *aggr;
+	char buf[PREFIX2STR_BUFFER];
+
+	if (ospf6->aggr_delay_interval != OSPF6_EXTL_AGGR_DEFAULT_DELAY)
+		vty_out(vty, " aggregation timer %u\n",
+				ospf6->aggr_delay_interval);
+
+	/* print 'summary-address A:B::C:D/M' */
+	for (rn = route_top(ospf6->rt_aggr_tbl); rn; rn = route_next(rn)) {
+		if (!rn->info)
+			continue;
+
+		aggr = rn->info;
+
+		prefix2str(&aggr->p, buf, sizeof(buf));
+		vty_out(vty, " summary-address %s", buf);
+		if (aggr->tag)
+			vty_out(vty, " tag %u", aggr->tag);
+
+		if (aggr->metric != -1)
+			vty_out(vty, " metric %d", aggr->metric);
+
+		if (aggr->mtype != DEFAULT_METRIC_TYPE)
+			vty_out(vty, " metric-type %d", aggr->mtype);
+
+		if (CHECK_FLAG(aggr->aggrflags,
+			       OSPF6_EXTERNAL_AGGRT_NO_ADVERTISE))
+			vty_out(vty, " no-advertise");
+
+		vty_out(vty, "\n");
+	}
+
+	return 0;
+}
+
+/* OSPF configuration write function. */
+static int config_write_ospf6(struct vty *vty)
+{
+	struct ospf6 *ospf6;
+	struct listnode *node, *nnode;
+
+	/* OSPFv3 configuration. */
+	if (om6 == NULL)
+		return CMD_SUCCESS;
+
+	for (ALL_LIST_ELEMENTS(om6->ospf6, node, nnode, ospf6)) {
+		if (ospf6->name && strcmp(ospf6->name, VRF_DEFAULT_NAME))
+			vty_out(vty, "router ospf6 vrf %s\n", ospf6->name);
+		else
+			vty_out(vty, "router ospf6\n");
+
+		if (ospf6->router_id_static != 0)
+			vty_out(vty, " ospf6 router-id %pI4\n",
+				&ospf6->router_id_static);
+
+		if (CHECK_FLAG(ospf6->config_flags,
+			       OSPF6_SEND_EXTRA_DATA_TO_ZEBRA))
+			vty_out(vty, " ospf6 send-extra-data zebra\n");
+
+		/* log-adjacency-changes flag print. */
+		if (CHECK_FLAG(ospf6->config_flags,
+			       OSPF6_LOG_ADJACENCY_CHANGES)) {
+			if (CHECK_FLAG(ospf6->config_flags,
+				       OSPF6_LOG_ADJACENCY_DETAIL))
+				vty_out(vty, " log-adjacency-changes detail\n");
+			else if (!SAVE_OSPF6_LOG_ADJACENCY_CHANGES)
+				vty_out(vty, " log-adjacency-changes\n");
+		} else if (SAVE_OSPF6_LOG_ADJACENCY_CHANGES) {
+			vty_out(vty, " no log-adjacency-changes\n");
+		}
+
+		if (ospf6->ref_bandwidth != OSPF6_REFERENCE_BANDWIDTH)
+			vty_out(vty, " auto-cost reference-bandwidth %d\n",
+				ospf6->ref_bandwidth);
+
+		if (ospf6->write_oi_count
+		    != OSPF6_WRITE_INTERFACE_COUNT_DEFAULT)
+			vty_out(vty, " write-multiplier %d\n",
+				ospf6->write_oi_count);
+
+		/* LSA timers print. */
+		if (ospf6->lsa_minarrival != OSPF_MIN_LS_ARRIVAL)
+			vty_out(vty, " timers lsa min-arrival %d\n",
+				ospf6->lsa_minarrival);
+
+		/* ECMP max path config */
+		if (ospf6->max_multipath != MULTIPATH_NUM)
+			vty_out(vty, " maximum-paths %d\n",
+				ospf6->max_multipath);
+
+		ospf6_stub_router_config_write(vty, ospf6);
+		ospf6_redistribute_config_write(vty, ospf6);
+		ospf6_area_config_write(vty, ospf6);
+		ospf6_spf_config_write(vty, ospf6);
+		ospf6_distance_config_write(vty, ospf6);
+		ospf6_distribute_config_write(vty, ospf6);
+		ospf6_asbr_summary_config_write(vty, ospf6);
+		config_write_ospf6_gr(vty, ospf6);
+		config_write_ospf6_gr_helper(vty, ospf6);
+
+		vty_out(vty, "exit\n");
+		vty_out(vty, "!\n");
+	}
+	return 0;
+}
+
+static int config_write_ospf6(struct vty *vty);
+/* OSPF6 node structure. */
+static struct cmd_node ospf6_node = {
+	.name = "ospf6",
+	.node = OSPF6_NODE,
+	.parent_node = CONFIG_NODE,
+	.prompt = "%s(config-ospf6)# ",
+	.config_write = config_write_ospf6,
+};
+
+void install_element_ospf6_clear_process(void)
+{
+	install_element(ENABLE_NODE, &clear_router_ospf6_cmd);
+}
+
+/* Install ospf related commands. */
+void ospf6_top_init(void)
+{
+	/* Install ospf6 top node. */
+	install_node(&ospf6_node);
+
+	install_element(VIEW_NODE, &show_ipv6_ospf6_cmd);
+	install_element(VIEW_NODE, &show_ipv6_ospf6_vrfs_cmd);
+	install_element(CONFIG_NODE, &router_ospf6_cmd);
+	install_element(CONFIG_NODE, &no_router_ospf6_cmd);
+
+	install_element(VIEW_NODE, &show_ipv6_ospf6_route_cmd);
+	install_element(VIEW_NODE, &show_ipv6_ospf6_route_match_cmd);
+	install_element(VIEW_NODE, &show_ipv6_ospf6_route_match_detail_cmd);
+	install_element(VIEW_NODE, &show_ipv6_ospf6_route_type_detail_cmd);
+
+	install_default(OSPF6_NODE);
+	install_element(OSPF6_NODE, &ospf6_router_id_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_router_id_cmd);
+	install_element(OSPF6_NODE, &ospf6_log_adjacency_changes_cmd);
+	install_element(OSPF6_NODE, &ospf6_log_adjacency_changes_detail_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_log_adjacency_changes_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_log_adjacency_changes_detail_cmd);
+	install_element(OSPF6_NODE, &ospf6_send_extra_data_cmd);
+
+	/* LSA timers commands */
+	install_element(OSPF6_NODE, &ospf6_timers_lsa_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_timers_lsa_cmd);
+
+	install_element(OSPF6_NODE, &ospf6_interface_area_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_interface_area_cmd);
+	install_element(OSPF6_NODE, &ospf6_stub_router_admin_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_stub_router_admin_cmd);
+
+	/* maximum-paths command */
+	install_element(OSPF6_NODE, &ospf6_max_multipath_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_max_multipath_cmd);
+
+	/* ASBR Summarisation */
+	install_element(OSPF6_NODE, &ospf6_external_route_aggregation_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_external_route_aggregation_cmd);
+	install_element(OSPF6_NODE,
+		&ospf6_external_route_aggregation_no_advertise_cmd);
+	install_element(OSPF6_NODE,
+			&no_ospf6_external_route_aggregation_no_advertise_cmd);
+	install_element(OSPF6_NODE, &ospf6_route_aggregation_timer_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_route_aggregation_timer_cmd);
+	install_element(VIEW_NODE, &show_ipv6_ospf6_external_aggregator_cmd);
+
+	install_element(OSPF6_NODE, &ospf6_distance_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_distance_cmd);
+	install_element(OSPF6_NODE, &ospf6_distance_ospf6_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_distance_ospf6_cmd);
+}