Adding upstream version 9.1.upstream/9.1

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

1 files changed, 3142 insertions, 0 deletions

diff --git a/ospf6d/ospf6_interface.c b/ospf6d/ospf6_interface.c
new file mode 100644
index 0000000..a79f993
--- /dev/null
+++ b/ospf6d/ospf6_interface.c
@@ -0,0 +1,3142 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2003 Yasuhiro Ohara
+ */
+
+#include <zebra.h>
+
+#include "memory.h"
+#include "if.h"
+#include "log.h"
+#include "command.h"
+#include "frrevent.h"
+#include "prefix.h"
+#include "plist.h"
+#include "zclient.h"
+
+#include "ospf6_lsa.h"
+#include "ospf6_lsdb.h"
+#include "ospf6_top.h"
+#include "ospf6_network.h"
+#include "ospf6_message.h"
+#include "ospf6_route.h"
+#include "ospf6_area.h"
+#include "ospf6_abr.h"
+#include "ospf6_nssa.h"
+#include "ospf6_interface.h"
+#include "ospf6_neighbor.h"
+#include "ospf6_intra.h"
+#include "ospf6_spf.h"
+#include "ospf6d.h"
+#include "ospf6_bfd.h"
+#include "ospf6_zebra.h"
+#include "ospf6_gr.h"
+#include "lib/json.h"
+#include "ospf6_proto.h"
+#include "lib/keychain.h"
+#include "ospf6_auth_trailer.h"
+#include "ospf6d/ospf6_interface_clippy.c"
+
+DEFINE_MTYPE_STATIC(OSPF6D, OSPF6_IF, "OSPF6 interface");
+DEFINE_MTYPE(OSPF6D, OSPF6_AUTH_KEYCHAIN, "OSPF6 auth keychain");
+DEFINE_MTYPE(OSPF6D, OSPF6_AUTH_MANUAL_KEY, "OSPF6 auth key");
+DEFINE_MTYPE_STATIC(OSPF6D, CFG_PLIST_NAME, "configured prefix list names");
+DEFINE_QOBJ_TYPE(ospf6_interface);
+DEFINE_HOOK(ospf6_interface_change,
+	    (struct ospf6_interface * oi, int state, int old_state),
+	    (oi, state, old_state));
+
+unsigned char conf_debug_ospf6_interface = 0;
+
+const char *const ospf6_interface_state_str[] = {
+	"None",    "Down", "Loopback", "Waiting", "PointToPoint",
+	"DROther", "BDR",  "DR",       NULL};
+
+int ospf6_interface_neighbor_count(struct ospf6_interface *oi)
+{
+	int count = 0;
+	struct ospf6_neighbor *nbr = NULL;
+	struct listnode *node;
+
+	for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, nbr)) {
+		/* Down state is not shown. */
+		if (nbr->state == OSPF6_NEIGHBOR_DOWN)
+			continue;
+		count++;
+	}
+
+	return count;
+}
+
+struct ospf6_interface *ospf6_interface_lookup_by_ifindex(ifindex_t ifindex,
+							  vrf_id_t vrf_id)
+{
+	struct ospf6_interface *oi;
+	struct interface *ifp;
+
+	ifp = if_lookup_by_index(ifindex, vrf_id);
+	if (ifp == NULL)
+		return (struct ospf6_interface *)NULL;
+
+	oi = (struct ospf6_interface *)ifp->info;
+	return oi;
+}
+
+/* schedule routing table recalculation */
+static void ospf6_interface_lsdb_hook(struct ospf6_lsa *lsa,
+				      unsigned int reason)
+{
+	struct ospf6_interface *oi;
+
+	if (lsa == NULL)
+		return;
+
+	oi = lsa->lsdb->data;
+	switch (ntohs(lsa->header->type)) {
+	case OSPF6_LSTYPE_LINK:
+		if (oi->state == OSPF6_INTERFACE_DR)
+			OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
+		if (oi->area)
+			ospf6_spf_schedule(oi->area->ospf6, reason);
+		break;
+
+	default:
+		break;
+	}
+}
+
+static void ospf6_interface_lsdb_hook_add(struct ospf6_lsa *lsa)
+{
+	ospf6_interface_lsdb_hook(lsa, ospf6_lsadd_to_spf_reason(lsa));
+}
+
+static void ospf6_interface_lsdb_hook_remove(struct ospf6_lsa *lsa)
+{
+	ospf6_interface_lsdb_hook(lsa, ospf6_lsremove_to_spf_reason(lsa));
+}
+
+static uint8_t ospf6_default_iftype(struct interface *ifp)
+{
+	if (if_is_pointopoint(ifp))
+		return OSPF_IFTYPE_POINTOPOINT;
+	else if (if_is_loopback(ifp))
+		return OSPF_IFTYPE_LOOPBACK;
+	else
+		return OSPF_IFTYPE_BROADCAST;
+}
+
+static uint32_t ospf6_interface_get_cost(struct ospf6_interface *oi)
+{
+	/* If all else fails, use default OSPF cost */
+	uint32_t cost;
+	uint32_t bw, refbw;
+	struct ospf6 *ospf6;
+
+	/* interface speed and bw can be 0 in some platforms,
+	 * use ospf default bw. If bw is configured then it would
+	 * be used.
+	 */
+	if (!oi->interface->bandwidth && oi->interface->speed) {
+		bw = oi->interface->speed;
+	} else {
+		bw = oi->interface->bandwidth ? oi->interface->bandwidth
+					      : OSPF6_INTERFACE_BANDWIDTH;
+	}
+
+	ospf6 = oi->interface->vrf->info;
+	refbw = ospf6 ? ospf6->ref_bandwidth : OSPF6_REFERENCE_BANDWIDTH;
+
+	/* A specified ip ospf cost overrides a calculated one. */
+	if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_NOAUTOCOST))
+		cost = oi->cost;
+	else {
+		cost = (uint32_t)((double)refbw / (double)bw + (double)0.5);
+		if (cost < 1)
+			cost = 1;
+
+		/* If the interface type is point-to-multipoint or the interface
+		 * is in the state Loopback, the global scope IPv6 addresses
+		 * associated with the interface (if any) are copied into the
+		 * intra-area-prefix-LSA with the PrefixOptions LA-bit set, the
+		 * PrefixLength set to 128, and the metric set to 0.
+		 */
+		if (if_is_loopback(oi->interface))
+			cost = 0;
+	}
+
+	return cost;
+}
+
+static void ospf6_interface_force_recalculate_cost(struct ospf6_interface *oi)
+{
+	/* update cost held in route_connected list in ospf6_interface */
+	ospf6_interface_connected_route_update(oi->interface);
+
+	/* execute LSA hooks */
+	if (oi->area) {
+		OSPF6_LINK_LSA_SCHEDULE(oi);
+		OSPF6_ROUTER_LSA_SCHEDULE(oi->area);
+		OSPF6_NETWORK_LSA_SCHEDULE(oi);
+		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
+		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
+	}
+}
+
+static void ospf6_interface_recalculate_cost(struct ospf6_interface *oi)
+{
+	uint32_t newcost;
+
+	newcost = ospf6_interface_get_cost(oi);
+	if (newcost == oi->cost)
+		return;
+	oi->cost = newcost;
+
+	ospf6_interface_force_recalculate_cost(oi);
+}
+
+/* Create new ospf6 interface structure */
+struct ospf6_interface *ospf6_interface_create(struct interface *ifp)
+{
+	struct ospf6_interface *oi;
+	unsigned int iobuflen;
+
+	oi = XCALLOC(MTYPE_OSPF6_IF, sizeof(struct ospf6_interface));
+
+	oi->obuf = ospf6_fifo_new();
+
+	oi->area = (struct ospf6_area *)NULL;
+	oi->neighbor_list = list_new();
+	oi->neighbor_list->cmp = ospf6_neighbor_cmp;
+	oi->linklocal_addr = (struct in6_addr *)NULL;
+	oi->instance_id = OSPF6_INTERFACE_INSTANCE_ID;
+	oi->transdelay = OSPF6_INTERFACE_TRANSDELAY;
+	oi->priority = OSPF6_INTERFACE_PRIORITY;
+
+	oi->hello_interval = OSPF_HELLO_INTERVAL_DEFAULT;
+	oi->gr.hello_delay.interval = OSPF_HELLO_DELAY_DEFAULT;
+	oi->dead_interval = OSPF_ROUTER_DEAD_INTERVAL_DEFAULT;
+	oi->rxmt_interval = OSPF_RETRANSMIT_INTERVAL_DEFAULT;
+	oi->type = ospf6_default_iftype(ifp);
+	oi->state = OSPF6_INTERFACE_DOWN;
+	oi->flag = 0;
+	oi->mtu_ignore = 0;
+	oi->c_ifmtu = 0;
+
+	/* Try to adjust I/O buffer size with IfMtu */
+	oi->ifmtu = ifp->mtu6;
+	iobuflen = ospf6_iobuf_size(ifp->mtu6);
+	if (oi->ifmtu > iobuflen) {
+		if (IS_OSPF6_DEBUG_INTERFACE)
+			zlog_debug(
+				"Interface %s: IfMtu is adjusted to I/O buffer size: %d.",
+				ifp->name, iobuflen);
+		oi->ifmtu = iobuflen;
+	}
+
+	QOBJ_REG(oi, ospf6_interface);
+
+	oi->lsupdate_list = ospf6_lsdb_create(oi);
+	oi->lsack_list = ospf6_lsdb_create(oi);
+	oi->lsdb = ospf6_lsdb_create(oi);
+	oi->lsdb->hook_add = ospf6_interface_lsdb_hook_add;
+	oi->lsdb->hook_remove = ospf6_interface_lsdb_hook_remove;
+	oi->lsdb_self = ospf6_lsdb_create(oi);
+
+	oi->route_connected =
+		OSPF6_ROUTE_TABLE_CREATE(INTERFACE, CONNECTED_ROUTES);
+	oi->route_connected->scope = oi;
+
+	/* link both */
+	oi->interface = ifp;
+	ifp->info = oi;
+
+	/* Compute cost. */
+	oi->cost = ospf6_interface_get_cost(oi);
+
+	oi->at_data.flags = 0;
+
+	return oi;
+}
+
+void ospf6_interface_delete(struct ospf6_interface *oi)
+{
+	struct listnode *node, *nnode;
+	struct ospf6_neighbor *on;
+
+	QOBJ_UNREG(oi);
+
+	ospf6_fifo_free(oi->obuf);
+
+	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
+		ospf6_neighbor_delete(on);
+
+	list_delete(&oi->neighbor_list);
+
+	EVENT_OFF(oi->thread_send_hello);
+	EVENT_OFF(oi->thread_send_lsupdate);
+	EVENT_OFF(oi->thread_send_lsack);
+	EVENT_OFF(oi->thread_sso);
+	EVENT_OFF(oi->thread_wait_timer);
+
+	ospf6_lsdb_remove_all(oi->lsdb);
+	ospf6_lsdb_remove_all(oi->lsupdate_list);
+	ospf6_lsdb_remove_all(oi->lsack_list);
+
+	ospf6_lsdb_delete(oi->lsdb);
+	ospf6_lsdb_delete(oi->lsdb_self);
+
+	ospf6_lsdb_delete(oi->lsupdate_list);
+	ospf6_lsdb_delete(oi->lsack_list);
+
+	ospf6_route_table_delete(oi->route_connected);
+
+	/* cut link */
+	oi->interface->info = NULL;
+
+	/* plist_name */
+	if (oi->plist_name)
+		XFREE(MTYPE_CFG_PLIST_NAME, oi->plist_name);
+
+	/* disable from area list if possible */
+	ospf6_area_interface_delete(oi);
+
+	if (oi->at_data.auth_key)
+		XFREE(MTYPE_OSPF6_AUTH_MANUAL_KEY, oi->at_data.auth_key);
+
+	/* Free BFD allocated data. */
+	XFREE(MTYPE_TMP, oi->bfd_config.profile);
+
+	XFREE(MTYPE_OSPF6_IF, oi);
+}
+
+void ospf6_interface_enable(struct ospf6_interface *oi)
+{
+	UNSET_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE);
+	ospf6_interface_state_update(oi->interface);
+}
+
+void ospf6_interface_disable(struct ospf6_interface *oi)
+{
+	SET_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE);
+
+	event_execute(master, interface_down, oi, 0, NULL);
+
+	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);
+
+	EVENT_OFF(oi->thread_send_hello);
+	EVENT_OFF(oi->thread_send_lsupdate);
+	EVENT_OFF(oi->thread_send_lsack);
+	EVENT_OFF(oi->thread_sso);
+
+	EVENT_OFF(oi->thread_network_lsa);
+	EVENT_OFF(oi->thread_link_lsa);
+	EVENT_OFF(oi->thread_intra_prefix_lsa);
+	EVENT_OFF(oi->thread_as_extern_lsa);
+	EVENT_OFF(oi->thread_wait_timer);
+
+	oi->gr.hello_delay.elapsed_seconds = 0;
+	EVENT_OFF(oi->gr.hello_delay.t_grace_send);
+}
+
+static struct in6_addr *
+ospf6_interface_get_linklocal_address(struct interface *ifp)
+{
+	struct listnode *n;
+	struct connected *c;
+	struct in6_addr *l = (struct in6_addr *)NULL;
+
+	/* for each connected address */
+	for (ALL_LIST_ELEMENTS_RO(ifp->connected, n, c)) {
+		/* if family not AF_INET6, ignore */
+		if (c->address->family != AF_INET6)
+			continue;
+
+		/* linklocal scope check */
+		if (IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6))
+			l = &c->address->u.prefix6;
+	}
+	return l;
+}
+
+void ospf6_interface_state_update(struct interface *ifp)
+{
+	struct ospf6_interface *oi;
+	unsigned int iobuflen;
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		return;
+	if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE))
+		return;
+
+	/* Adjust the mtu values if the kernel told us something new */
+	if (ifp->mtu6 != oi->ifmtu) {
+		/* If nothing configured, accept it and check for buffer size */
+		if (!oi->c_ifmtu) {
+			oi->ifmtu = ifp->mtu6;
+			iobuflen = ospf6_iobuf_size(ifp->mtu6);
+			if (oi->ifmtu > iobuflen) {
+				if (IS_OSPF6_DEBUG_INTERFACE)
+					zlog_debug(
+						"Interface %s: IfMtu is adjusted to I/O buffer size: %d.",
+						ifp->name, iobuflen);
+				oi->ifmtu = iobuflen;
+			}
+		} else if (oi->c_ifmtu > ifp->mtu6) {
+			oi->ifmtu = ifp->mtu6;
+			zlog_warn(
+				"Configured mtu %u on %s overridden by kernel %u",
+				oi->c_ifmtu, ifp->name, ifp->mtu6);
+		} else
+			oi->ifmtu = oi->c_ifmtu;
+	}
+
+	if (if_is_operative(ifp)
+	    && (ospf6_interface_get_linklocal_address(oi->interface)
+		|| if_is_loopback(oi->interface)))
+		event_execute(master, interface_up, oi, 0, NULL);
+	else
+		event_execute(master, interface_down, oi, 0, NULL);
+
+	return;
+}
+
+void ospf6_interface_connected_route_update(struct interface *ifp)
+{
+	struct ospf6_interface *oi;
+	struct ospf6_route *route;
+	struct connected *c;
+	struct listnode *node, *nnode;
+	struct in6_addr nh_addr;
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		return;
+
+	/* reset linklocal pointer */
+	oi->linklocal_addr = ospf6_interface_get_linklocal_address(ifp);
+
+	/* if area is null, do not make connected-route list */
+	if (oi->area == NULL)
+		return;
+
+	if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE))
+		return;
+
+	/* update "route to advertise" interface route table */
+	ospf6_route_remove_all(oi->route_connected);
+
+	for (ALL_LIST_ELEMENTS(oi->interface->connected, node, nnode, c)) {
+		if (c->address->family != AF_INET6)
+			continue;
+
+		CONTINUE_IF_ADDRESS_LINKLOCAL(IS_OSPF6_DEBUG_INTERFACE,
+					      c->address);
+		CONTINUE_IF_ADDRESS_UNSPECIFIED(IS_OSPF6_DEBUG_INTERFACE,
+						c->address);
+		CONTINUE_IF_ADDRESS_LOOPBACK(IS_OSPF6_DEBUG_INTERFACE,
+					     c->address);
+		CONTINUE_IF_ADDRESS_V4COMPAT(IS_OSPF6_DEBUG_INTERFACE,
+					     c->address);
+		CONTINUE_IF_ADDRESS_V4MAPPED(IS_OSPF6_DEBUG_INTERFACE,
+					     c->address);
+
+		/* apply filter */
+		if (oi->plist_name) {
+			struct prefix_list *plist;
+			enum prefix_list_type ret;
+
+			plist = prefix_list_lookup(AFI_IP6, oi->plist_name);
+			ret = prefix_list_apply(plist, (void *)c->address);
+			if (ret == PREFIX_DENY) {
+				if (IS_OSPF6_DEBUG_INTERFACE)
+					zlog_debug(
+						"%pFX on %s filtered by prefix-list %s ",
+						c->address, oi->interface->name,
+						oi->plist_name);
+				continue;
+			}
+		}
+
+		route = ospf6_route_create(oi->area->ospf6);
+		memcpy(&route->prefix, c->address, sizeof(struct prefix));
+		apply_mask(&route->prefix);
+		route->type = OSPF6_DEST_TYPE_NETWORK;
+		route->path.area_id = oi->area->area_id;
+		route->path.type = OSPF6_PATH_TYPE_INTRA;
+		route->path.cost = oi->cost;
+		inet_pton(AF_INET6, "::1", &nh_addr);
+		ospf6_route_add_nexthop(route, oi->interface->ifindex,
+					&nh_addr);
+		ospf6_route_add(route, oi->route_connected);
+	}
+
+	/* create new Link-LSA */
+	OSPF6_LINK_LSA_SCHEDULE(oi);
+	OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
+	OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
+}
+
+static int ospf6_interface_state_change(uint8_t next_state,
+					struct ospf6_interface *oi)
+{
+	uint8_t prev_state;
+	struct ospf6 *ospf6;
+
+	prev_state = oi->state;
+	oi->state = next_state;
+
+	if (prev_state == next_state)
+		return -1;
+
+	if (!oi->area)
+		return -1;
+
+	/* log */
+	if (IS_OSPF6_DEBUG_INTERFACE) {
+		zlog_debug("Interface state change %s: %s -> %s",
+			   oi->interface->name,
+			   ospf6_interface_state_str[prev_state],
+			   ospf6_interface_state_str[next_state]);
+	}
+	oi->state_change++;
+
+	ospf6 = oi->area->ospf6;
+
+	if ((prev_state == OSPF6_INTERFACE_DR
+	     || prev_state == OSPF6_INTERFACE_BDR)
+	    && (next_state != OSPF6_INTERFACE_DR
+		&& next_state != OSPF6_INTERFACE_BDR))
+		ospf6_sso(oi->interface->ifindex, &alldrouters6,
+			  IPV6_LEAVE_GROUP, ospf6->fd);
+
+	if ((prev_state != OSPF6_INTERFACE_DR
+	     && prev_state != OSPF6_INTERFACE_BDR)
+	    && (next_state == OSPF6_INTERFACE_DR
+		|| next_state == OSPF6_INTERFACE_BDR))
+		ospf6_sso(oi->interface->ifindex, &alldrouters6,
+			  IPV6_JOIN_GROUP, ospf6->fd);
+
+	OSPF6_ROUTER_LSA_SCHEDULE(oi->area);
+	OSPF6_LINK_LSA_SCHEDULE(oi);
+	if (next_state == OSPF6_INTERFACE_DOWN) {
+		OSPF6_NETWORK_LSA_EXECUTE(oi);
+		OSPF6_INTRA_PREFIX_LSA_EXECUTE_TRANSIT(oi);
+		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
+	} else if (prev_state == OSPF6_INTERFACE_DR
+		   || next_state == OSPF6_INTERFACE_DR) {
+		OSPF6_NETWORK_LSA_SCHEDULE(oi);
+		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
+		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
+	}
+
+	hook_call(ospf6_interface_change, oi, next_state, prev_state);
+
+	return 0;
+}
+
+
+/* DR Election, RFC2328 section 9.4 */
+
+#define IS_ELIGIBLE(n)                                                         \
+	((n)->state >= OSPF6_NEIGHBOR_TWOWAY && (n)->priority != 0)
+
+static struct ospf6_neighbor *better_bdrouter(struct ospf6_neighbor *a,
+					      struct ospf6_neighbor *b)
+{
+	if ((a == NULL || !IS_ELIGIBLE(a) || a->drouter == a->router_id)
+	    && (b == NULL || !IS_ELIGIBLE(b) || b->drouter == b->router_id))
+		return NULL;
+	else if (a == NULL || !IS_ELIGIBLE(a) || a->drouter == a->router_id)
+		return b;
+	else if (b == NULL || !IS_ELIGIBLE(b) || b->drouter == b->router_id)
+		return a;
+
+	if (a->bdrouter == a->router_id && b->bdrouter != b->router_id)
+		return a;
+	if (a->bdrouter != a->router_id && b->bdrouter == b->router_id)
+		return b;
+
+	if (a->priority > b->priority)
+		return a;
+	if (a->priority < b->priority)
+		return b;
+
+	if (ntohl(a->router_id) > ntohl(b->router_id))
+		return a;
+	if (ntohl(a->router_id) < ntohl(b->router_id))
+		return b;
+
+	zlog_warn("Router-ID duplicate ?");
+	return a;
+}
+
+static struct ospf6_neighbor *better_drouter(struct ospf6_neighbor *a,
+					     struct ospf6_neighbor *b)
+{
+	if ((a == NULL || !IS_ELIGIBLE(a) || a->drouter != a->router_id)
+	    && (b == NULL || !IS_ELIGIBLE(b) || b->drouter != b->router_id))
+		return NULL;
+	else if (a == NULL || !IS_ELIGIBLE(a) || a->drouter != a->router_id)
+		return b;
+	else if (b == NULL || !IS_ELIGIBLE(b) || b->drouter != b->router_id)
+		return a;
+
+	if (a->drouter == a->router_id && b->drouter != b->router_id)
+		return a;
+	if (a->drouter != a->router_id && b->drouter == b->router_id)
+		return b;
+
+	if (a->priority > b->priority)
+		return a;
+	if (a->priority < b->priority)
+		return b;
+
+	if (ntohl(a->router_id) > ntohl(b->router_id))
+		return a;
+	if (ntohl(a->router_id) < ntohl(b->router_id))
+		return b;
+
+	zlog_warn("Router-ID duplicate ?");
+	return a;
+}
+
+uint8_t dr_election(struct ospf6_interface *oi)
+{
+	struct ospf6 *ospf6 = oi->area->ospf6;
+	struct listnode *node, *nnode;
+	struct ospf6_neighbor *on, *drouter, *bdrouter, myself;
+	struct ospf6_neighbor *best_drouter, *best_bdrouter;
+	uint8_t next_state = 0;
+
+	drouter = bdrouter = NULL;
+	best_drouter = best_bdrouter = NULL;
+
+	/* pseudo neighbor myself, including noting current DR/BDR (1) */
+	memset(&myself, 0, sizeof(myself));
+	inet_ntop(AF_INET, &ospf6->router_id, myself.name, sizeof(myself.name));
+	myself.state = OSPF6_NEIGHBOR_TWOWAY;
+	myself.drouter = oi->drouter;
+	myself.bdrouter = oi->bdrouter;
+	myself.priority = oi->priority;
+	myself.router_id = ospf6->router_id;
+
+	/* Electing BDR (2) */
+	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
+		bdrouter = better_bdrouter(bdrouter, on);
+
+	best_bdrouter = bdrouter;
+	bdrouter = better_bdrouter(best_bdrouter, &myself);
+
+	/* Electing DR (3) */
+	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
+		drouter = better_drouter(drouter, on);
+
+	best_drouter = drouter;
+	drouter = better_drouter(best_drouter, &myself);
+	if (drouter == NULL)
+		drouter = bdrouter;
+
+	/* the router itself is newly/no longer DR/BDR (4) */
+	if ((drouter == &myself && myself.drouter != myself.router_id)
+	    || (drouter != &myself && myself.drouter == myself.router_id)
+	    || (bdrouter == &myself && myself.bdrouter != myself.router_id)
+	    || (bdrouter != &myself && myself.bdrouter == myself.router_id)) {
+		myself.drouter = (drouter ? drouter->router_id : htonl(0));
+		myself.bdrouter = (bdrouter ? bdrouter->router_id : htonl(0));
+
+		/* compatible to Electing BDR (2) */
+		bdrouter = better_bdrouter(best_bdrouter, &myself);
+
+		/* compatible to Electing DR (3) */
+		drouter = better_drouter(best_drouter, &myself);
+		if (drouter == NULL)
+			drouter = bdrouter;
+	}
+
+	/* Set interface state accordingly (5) */
+	if (drouter && drouter == &myself)
+		next_state = OSPF6_INTERFACE_DR;
+	else if (bdrouter && bdrouter == &myself)
+		next_state = OSPF6_INTERFACE_BDR;
+	else
+		next_state = OSPF6_INTERFACE_DROTHER;
+
+	/* If NBMA, schedule Start for each neighbor having priority of 0 (6) */
+	/* XXX */
+
+	/* If DR or BDR change, invoke AdjOK? for each neighbor (7) */
+	/* RFC 2328 section 12.4. Originating LSAs (3) will be handled
+	   accordingly after AdjOK */
+
+	if (oi->drouter != (drouter ? drouter->router_id : htonl(0)) ||
+	    oi->bdrouter != (bdrouter ? bdrouter->router_id : htonl(0)) ||
+	    ospf6->gr_info.restart_in_progress) {
+		if (IS_OSPF6_DEBUG_INTERFACE)
+			zlog_debug("DR Election on %s: DR: %s BDR: %s",
+				   oi->interface->name,
+				   (drouter ? drouter->name : "0.0.0.0"),
+				   (bdrouter ? bdrouter->name : "0.0.0.0"));
+
+		for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, node, on)) {
+			if (on->state < OSPF6_NEIGHBOR_TWOWAY)
+				continue;
+			/* Schedule AdjOK. */
+			event_add_event(master, adj_ok, on, 0,
+					&on->thread_adj_ok);
+		}
+	}
+
+	oi->drouter = (drouter ? drouter->router_id : htonl(0));
+	oi->bdrouter = (bdrouter ? bdrouter->router_id : htonl(0));
+	return next_state;
+}
+
+#ifdef __FreeBSD__
+
+#include <ifaddrs.h>
+
+static bool ifmaddr_check(ifindex_t ifindex, struct in6_addr *addr)
+{
+	struct ifmaddrs *ifmap, *ifma;
+	struct sockaddr_dl *sdl;
+	struct sockaddr_in6 *sin6;
+	bool found = false;
+
+	if (getifmaddrs(&ifmap) != 0)
+		return false;
+
+	for (ifma = ifmap; ifma; ifma = ifma->ifma_next) {
+		if (ifma->ifma_name == NULL || ifma->ifma_addr == NULL)
+			continue;
+		if (ifma->ifma_name->sa_family != AF_LINK)
+			continue;
+		if (ifma->ifma_addr->sa_family != AF_INET6)
+			continue;
+		sdl = (struct sockaddr_dl *)ifma->ifma_name;
+		sin6 = (struct sockaddr_in6 *)ifma->ifma_addr;
+		if (sdl->sdl_index == ifindex
+		    && memcmp(&sin6->sin6_addr, addr, IPV6_MAX_BYTELEN) == 0) {
+			found = true;
+			break;
+		}
+	}
+
+	if (ifmap)
+		freeifmaddrs(ifmap);
+
+	return found;
+}
+
+#endif /* __FreeBSD__ */
+
+/* Interface State Machine */
+void interface_up(struct event *thread)
+{
+	struct ospf6_interface *oi;
+	struct ospf6 *ospf6;
+
+	oi = (struct ospf6_interface *)EVENT_ARG(thread);
+	assert(oi && oi->interface);
+
+	if (!oi->type_cfg)
+		oi->type = ospf6_default_iftype(oi->interface);
+
+	event_cancel(&oi->thread_sso);
+
+	if (IS_OSPF6_DEBUG_INTERFACE)
+		zlog_debug("Interface Event %s: [InterfaceUp]",
+			   oi->interface->name);
+
+	/* check physical interface is up */
+	if (!if_is_operative(oi->interface)) {
+		zlog_warn("Interface %s is down, can't execute [InterfaceUp]",
+			  oi->interface->name);
+		return;
+	}
+
+	/* check interface has a link-local address */
+	if (!(ospf6_interface_get_linklocal_address(oi->interface)
+	      || if_is_loopback(oi->interface))) {
+		zlog_warn(
+			"Interface %s has no link local address, can't execute [InterfaceUp]",
+			oi->interface->name);
+		return;
+	}
+
+	/* Recompute cost */
+	ospf6_interface_recalculate_cost(oi);
+
+	/* if already enabled, do nothing */
+	if (oi->state > OSPF6_INTERFACE_DOWN) {
+		if (IS_OSPF6_DEBUG_INTERFACE)
+			zlog_debug("Interface %s already enabled",
+				   oi->interface->name);
+		return;
+	}
+
+	/* If no area assigned, return */
+	if (oi->area == NULL) {
+		zlog_warn(
+			"%s: Not scheduling Hello for %s as there is no area assigned yet",
+			__func__, oi->interface->name);
+		return;
+	}
+
+	/*
+	 * RFC 3623 - Section 5 ("Unplanned Outages"):
+	 * "The grace-LSAs are encapsulated in Link State Update Packets
+	 * and sent out to all interfaces, even though the restarted
+	 * router has no adjacencies and no knowledge of previous
+	 * adjacencies".
+	 */
+	if (oi->area->ospf6->gr_info.restart_in_progress &&
+	    oi->area->ospf6->gr_info.reason == OSPF6_GR_UNKNOWN_RESTART)
+		ospf6_gr_unplanned_start_interface(oi);
+
+#ifdef __FreeBSD__
+	/*
+	 * There's a delay in FreeBSD between issuing a command to leave a
+	 * multicast group and an actual leave. If we execute "no router ospf6"
+	 * and "router ospf6" fast enough, we can end up in a situation when OS
+	 * performs the leave later than it performs the join and the interface
+	 * remains without a multicast group. We have to do the join only after
+	 * the interface actually left the group.
+	 */
+	if (ifmaddr_check(oi->interface->ifindex, &allspfrouters6)) {
+		zlog_info(
+			"Interface %s is still in all routers group, rescheduling for SSO",
+			oi->interface->name);
+		event_add_timer(master, interface_up, oi,
+				OSPF6_INTERFACE_SSO_RETRY_INT, &oi->thread_sso);
+		return;
+	}
+#endif /* __FreeBSD__ */
+
+	ospf6 = oi->area->ospf6;
+
+	/* Join AllSPFRouters */
+	if (ospf6_sso(oi->interface->ifindex, &allspfrouters6, IPV6_JOIN_GROUP,
+		      ospf6->fd)
+	    < 0) {
+		if (oi->sso_try_cnt++ < OSPF6_INTERFACE_SSO_RETRY_MAX) {
+			zlog_info(
+				"Scheduling %s for sso retry, trial count: %d",
+				oi->interface->name, oi->sso_try_cnt);
+			event_add_timer(master, interface_up, oi,
+					OSPF6_INTERFACE_SSO_RETRY_INT,
+					&oi->thread_sso);
+		}
+		return;
+	}
+	oi->sso_try_cnt = 0; /* Reset on success */
+
+	/* Update interface route */
+	ospf6_interface_connected_route_update(oi->interface);
+
+	/* Schedule Hello */
+	if (!CHECK_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE)
+	    && !if_is_loopback(oi->interface)) {
+		event_add_timer(master, ospf6_hello_send, oi, 0,
+				&oi->thread_send_hello);
+	}
+
+	/* decide next interface state */
+	if (oi->type == OSPF_IFTYPE_LOOPBACK) {
+		ospf6_interface_state_change(OSPF6_INTERFACE_LOOPBACK, oi);
+	} else if (oi->type == OSPF_IFTYPE_POINTOPOINT) {
+		ospf6_interface_state_change(OSPF6_INTERFACE_POINTTOPOINT, oi);
+	} else if (oi->priority == 0)
+		ospf6_interface_state_change(OSPF6_INTERFACE_DROTHER, oi);
+	else {
+		ospf6_interface_state_change(OSPF6_INTERFACE_WAITING, oi);
+		event_add_timer(master, wait_timer, oi, oi->dead_interval,
+				&oi->thread_wait_timer);
+	}
+}
+
+void wait_timer(struct event *thread)
+{
+	struct ospf6_interface *oi;
+
+	oi = (struct ospf6_interface *)EVENT_ARG(thread);
+	assert(oi && oi->interface);
+
+	if (IS_OSPF6_DEBUG_INTERFACE)
+		zlog_debug("Interface Event %s: [WaitTimer]",
+			   oi->interface->name);
+
+	if (oi->state == OSPF6_INTERFACE_WAITING)
+		ospf6_interface_state_change(dr_election(oi), oi);
+}
+
+void backup_seen(struct event *thread)
+{
+	struct ospf6_interface *oi;
+
+	oi = (struct ospf6_interface *)EVENT_ARG(thread);
+	assert(oi && oi->interface);
+
+	if (IS_OSPF6_DEBUG_INTERFACE)
+		zlog_debug("Interface Event %s: [BackupSeen]",
+			   oi->interface->name);
+
+	if (oi->state == OSPF6_INTERFACE_WAITING)
+		ospf6_interface_state_change(dr_election(oi), oi);
+}
+
+void neighbor_change(struct event *thread)
+{
+	struct ospf6_interface *oi;
+
+	oi = (struct ospf6_interface *)EVENT_ARG(thread);
+	assert(oi && oi->interface);
+
+	if (IS_OSPF6_DEBUG_INTERFACE)
+		zlog_debug("Interface Event %s: [NeighborChange]",
+			   oi->interface->name);
+
+	if (oi->state == OSPF6_INTERFACE_DROTHER
+	    || oi->state == OSPF6_INTERFACE_BDR
+	    || oi->state == OSPF6_INTERFACE_DR)
+		ospf6_interface_state_change(dr_election(oi), oi);
+}
+
+void interface_down(struct event *thread)
+{
+	struct ospf6_interface *oi;
+	struct listnode *node, *nnode;
+	struct ospf6_neighbor *on;
+	struct ospf6 *ospf6;
+
+	oi = (struct ospf6_interface *)EVENT_ARG(thread);
+	assert(oi && oi->interface);
+
+	if (IS_OSPF6_DEBUG_INTERFACE)
+		zlog_debug("Interface Event %s: [InterfaceDown]",
+			   oi->interface->name);
+
+	/* Stop Hellos */
+	EVENT_OFF(oi->thread_send_hello);
+
+	/* Stop trying to set socket options. */
+	EVENT_OFF(oi->thread_sso);
+
+	/* Cease the HELPER role for all the neighbours
+	 * of this interface.
+	 */
+	if (ospf6_interface_neighbor_count(oi)) {
+		struct listnode *ln;
+		struct ospf6_neighbor *nbr = NULL;
+
+		for (ALL_LIST_ELEMENTS_RO(oi->neighbor_list, ln, nbr))
+			ospf6_gr_helper_exit(nbr, OSPF6_GR_HELPER_TOPO_CHG);
+	}
+
+	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on))
+		ospf6_neighbor_delete(on);
+
+	list_delete_all_node(oi->neighbor_list);
+
+	/* When interface state is reset, also reset information about
+	 * DR election, as it is no longer valid. */
+	oi->drouter = oi->prev_drouter = htonl(0);
+	oi->bdrouter = oi->prev_bdrouter = htonl(0);
+
+	if (oi->area == NULL)
+		return;
+
+	ospf6 = oi->area->ospf6;
+	/* Leave AllSPFRouters */
+	if (oi->state > OSPF6_INTERFACE_DOWN)
+		ospf6_sso(oi->interface->ifindex, &allspfrouters6,
+			  IPV6_LEAVE_GROUP, ospf6->fd);
+
+	/* deal with write fifo */
+	ospf6_fifo_flush(oi->obuf);
+	if (oi->on_write_q) {
+		listnode_delete(ospf6->oi_write_q, oi);
+		if (list_isempty(ospf6->oi_write_q))
+			event_cancel(&ospf6->t_write);
+		oi->on_write_q = 0;
+	}
+
+	ospf6_interface_state_change(OSPF6_INTERFACE_DOWN, oi);
+}
+
+
+static const char *ospf6_iftype_str(uint8_t iftype)
+{
+	switch (iftype) {
+	case OSPF_IFTYPE_LOOPBACK:
+		return "LOOPBACK";
+	case OSPF_IFTYPE_BROADCAST:
+		return "BROADCAST";
+	case OSPF_IFTYPE_POINTOPOINT:
+		return "POINTOPOINT";
+	}
+	return "UNKNOWN";
+}
+
+/* show specified interface structure */
+static int ospf6_interface_show(struct vty *vty, struct interface *ifp,
+				json_object *json_obj, bool use_json)
+{
+	struct ospf6_interface *oi;
+	struct connected *c;
+	struct prefix *p;
+	struct listnode *i;
+	char strbuf[PREFIX2STR_BUFFER], drouter[32], bdrouter[32];
+	uint8_t default_iftype;
+	struct timeval res, now;
+	char duration[32];
+	struct ospf6_lsa *lsa, *lsanext;
+	json_object *json_arr;
+	json_object *json_addr;
+	struct json_object *json_auth = NULL;
+
+	default_iftype = ospf6_default_iftype(ifp);
+
+	if (use_json) {
+		json_object_string_add(json_obj, "status",
+				       (if_is_operative(ifp) ? "up" : "down"));
+		json_object_string_add(json_obj, "type",
+				       ospf6_iftype_str(default_iftype));
+		json_object_int_add(json_obj, "interfaceId", ifp->ifindex);
+
+		if (ifp->info == NULL)
+			return 0;
+
+		oi = (struct ospf6_interface *)ifp->info;
+
+		if (if_is_operative(ifp) && oi->type != default_iftype)
+			json_object_string_add(json_obj, "operatingAsType",
+					       ospf6_iftype_str(oi->type));
+
+	} else {
+		vty_out(vty, "%s is %s, type %s\n", ifp->name,
+			(if_is_operative(ifp) ? "up" : "down"),
+			ospf6_iftype_str(default_iftype));
+		vty_out(vty, "  Interface ID: %d\n", ifp->ifindex);
+
+		if (ifp->info == NULL) {
+			vty_out(vty, "   OSPF not enabled on this interface\n");
+			return 0;
+		}
+		oi = (struct ospf6_interface *)ifp->info;
+
+		if (if_is_operative(ifp) && oi->type != default_iftype)
+			vty_out(vty, "  Operating as type %s\n",
+				ospf6_iftype_str(oi->type));
+	}
+
+	if (use_json) {
+		json_arr = json_object_new_array();
+		for (ALL_LIST_ELEMENTS_RO(ifp->connected, i, c)) {
+			json_addr = json_object_new_object();
+			p = c->address;
+			prefix2str(p, strbuf, sizeof(strbuf));
+			switch (p->family) {
+			case AF_INET:
+				json_object_string_add(json_addr, "type",
+						       "inet");
+				json_object_string_add(json_addr, "address",
+						       strbuf);
+				json_object_array_add(json_arr, json_addr);
+				break;
+			case AF_INET6:
+				json_object_string_add(json_addr, "type",
+						       "inet6");
+				json_object_string_add(json_addr, "address",
+						       strbuf);
+				json_object_array_add(json_arr, json_addr);
+				break;
+			default:
+				json_object_string_add(json_addr, "type",
+						       "unknown");
+				json_object_string_add(json_addr, "address",
+						       strbuf);
+				json_object_array_add(json_arr, json_addr);
+				break;
+			}
+		}
+		json_object_object_add(json_obj, "internetAddress", json_arr);
+	} else {
+		vty_out(vty, "  Internet Address:\n");
+
+		for (ALL_LIST_ELEMENTS_RO(ifp->connected, i, c)) {
+			p = c->address;
+			prefix2str(p, strbuf, sizeof(strbuf));
+			switch (p->family) {
+			case AF_INET:
+				vty_out(vty, "    inet : %pFX\n", p);
+				break;
+			case AF_INET6:
+				vty_out(vty, "    inet6: %pFX\n", p);
+				break;
+			default:
+				vty_out(vty, "    ???  : %pFX\n", p);
+				break;
+			}
+		}
+	}
+
+	if (use_json) {
+		if (oi->area) {
+			json_object_boolean_true_add(json_obj,
+						     "attachedToArea");
+			json_object_int_add(json_obj, "instanceId",
+					    oi->instance_id);
+			json_object_int_add(json_obj, "interfaceMtu",
+					    oi->ifmtu);
+			json_object_int_add(json_obj, "autoDetect", ifp->mtu6);
+			json_object_string_add(json_obj, "mtuMismatchDetection",
+					       oi->mtu_ignore ? "disabled"
+							      : "enabled");
+			inet_ntop(AF_INET, &oi->area->area_id, strbuf,
+				  sizeof(strbuf));
+			json_object_string_add(json_obj, "areaId", strbuf);
+			json_object_int_add(json_obj, "cost", oi->cost);
+		} else
+			json_object_boolean_false_add(json_obj,
+						      "attachedToArea");
+
+	} else {
+		if (oi->area) {
+			vty_out(vty,
+				"  Instance ID %d, Interface MTU %d (autodetect: %d)\n",
+				oi->instance_id, oi->ifmtu, ifp->mtu6);
+			vty_out(vty, "  MTU mismatch detection: %s\n",
+				oi->mtu_ignore ? "disabled" : "enabled");
+			inet_ntop(AF_INET, &oi->area->area_id, strbuf,
+				  sizeof(strbuf));
+			vty_out(vty, "  Area ID %s, Cost %u\n", strbuf,
+				oi->cost);
+		} else
+			vty_out(vty, "  Not Attached to Area\n");
+	}
+
+	if (use_json) {
+		json_object_string_add(json_obj, "ospf6InterfaceState",
+				       ospf6_interface_state_str[oi->state]);
+		json_object_int_add(json_obj, "transmitDelaySec",
+				    oi->transdelay);
+		json_object_int_add(json_obj, "priority", oi->priority);
+		json_object_int_add(json_obj, "timerIntervalsConfigHello",
+				    oi->hello_interval);
+		json_object_int_add(json_obj, "timerIntervalsConfigDead",
+				    oi->dead_interval);
+		json_object_int_add(json_obj, "timerIntervalsConfigRetransmit",
+				    oi->rxmt_interval);
+		json_object_boolean_add(
+			json_obj, "timerPassiveIface",
+			!!CHECK_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE));
+	} else {
+		vty_out(vty, "  State %s, Transmit Delay %d sec, Priority %d\n",
+			ospf6_interface_state_str[oi->state], oi->transdelay,
+			oi->priority);
+		vty_out(vty, "  Timer intervals configured:\n");
+		if (!CHECK_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE))
+			vty_out(vty,
+				"   Hello %d(%pTHd), Dead %d, Retransmit %d\n",
+				oi->hello_interval, oi->thread_send_hello,
+				oi->dead_interval, oi->rxmt_interval);
+		else
+			vty_out(vty, "   No Hellos (Passive interface)\n");
+	}
+
+	inet_ntop(AF_INET, &oi->drouter, drouter, sizeof(drouter));
+	inet_ntop(AF_INET, &oi->bdrouter, bdrouter, sizeof(bdrouter));
+	if (use_json) {
+		json_object_string_add(json_obj, "dr", drouter);
+		json_object_string_add(json_obj, "bdr", bdrouter);
+		json_object_int_add(json_obj, "numberOfInterfaceScopedLsa",
+				    oi->lsdb->count);
+	} else {
+		vty_out(vty, "  DR: %s BDR: %s\n", drouter, bdrouter);
+		vty_out(vty, "  Number of I/F scoped LSAs is %u\n",
+			oi->lsdb->count);
+	}
+
+	monotime(&now);
+
+	if (use_json) {
+		timerclear(&res);
+		if (event_is_scheduled(oi->thread_send_lsupdate))
+			timersub(&oi->thread_send_lsupdate->u.sands, &now,
+				 &res);
+		timerstring(&res, duration, sizeof(duration));
+		json_object_int_add(json_obj, "pendingLsaLsUpdateCount",
+				    oi->lsupdate_list->count);
+		json_object_string_add(json_obj, "pendingLsaLsUpdateTime",
+				       duration);
+		json_object_string_add(
+			json_obj, "lsUpdateSendThread",
+			(event_is_scheduled(oi->thread_send_lsupdate) ? "on"
+								      : "off"));
+
+		json_arr = json_object_new_array();
+		for (ALL_LSDB(oi->lsupdate_list, lsa, lsanext))
+			json_object_array_add(
+				json_arr, json_object_new_string(lsa->name));
+		json_object_object_add(json_obj, "pendingLsaLsUpdate",
+				       json_arr);
+
+		timerclear(&res);
+		if (event_is_scheduled(oi->thread_send_lsack))
+			timersub(&oi->thread_send_lsack->u.sands, &now, &res);
+		timerstring(&res, duration, sizeof(duration));
+
+		json_object_int_add(json_obj, "pendingLsaLsAckCount",
+				    oi->lsack_list->count);
+		json_object_string_add(json_obj, "pendingLsaLsAckTime",
+				       duration);
+		json_object_string_add(
+			json_obj, "lsAckSendThread",
+			(event_is_scheduled(oi->thread_send_lsack) ? "on"
+								   : "off"));
+
+		json_arr = json_object_new_array();
+		for (ALL_LSDB(oi->lsack_list, lsa, lsanext))
+			json_object_array_add(
+				json_arr, json_object_new_string(lsa->name));
+		json_object_object_add(json_obj, "pendingLsaLsAck", json_arr);
+
+		if (oi->gr.hello_delay.interval != 0)
+			json_object_int_add(json_obj, "grHelloDelaySecs",
+					    oi->gr.hello_delay.interval);
+	} else {
+		timerclear(&res);
+		if (event_is_scheduled(oi->thread_send_lsupdate))
+			timersub(&oi->thread_send_lsupdate->u.sands, &now,
+				 &res);
+		timerstring(&res, duration, sizeof(duration));
+		vty_out(vty,
+			"    %d Pending LSAs for LSUpdate in Time %s [thread %s]\n",
+			oi->lsupdate_list->count, duration,
+			(event_is_scheduled(oi->thread_send_lsupdate) ? "on"
+								      : "off"));
+		for (ALL_LSDB(oi->lsupdate_list, lsa, lsanext))
+			vty_out(vty, "      %s\n", lsa->name);
+
+		timerclear(&res);
+		if (event_is_scheduled(oi->thread_send_lsack))
+			timersub(&oi->thread_send_lsack->u.sands, &now, &res);
+		timerstring(&res, duration, sizeof(duration));
+		vty_out(vty,
+			"    %d Pending LSAs for LSAck in Time %s [thread %s]\n",
+			oi->lsack_list->count, duration,
+			(event_is_scheduled(oi->thread_send_lsack) ? "on"
+								   : "off"));
+		for (ALL_LSDB(oi->lsack_list, lsa, lsanext))
+			vty_out(vty, "      %s\n", lsa->name);
+
+		if (oi->gr.hello_delay.interval != 0)
+			vty_out(vty, "  Graceful Restart hello delay: %us\n",
+				oi->gr.hello_delay.interval);
+	}
+
+	/* BFD specific. */
+	if (oi->bfd_config.enabled) {
+		if (use_json) {
+			struct json_object *json_bfd = json_object_new_object();
+
+			json_object_int_add(
+				json_bfd, "detectMultiplier",
+				oi->bfd_config.detection_multiplier);
+			json_object_int_add(json_bfd, "rxMinInterval",
+					    oi->bfd_config.min_rx);
+			json_object_int_add(json_bfd, "txMinInterval",
+					    oi->bfd_config.min_tx);
+			json_object_object_add(json_obj, "peerBfdInfo",
+					       json_bfd);
+		} else {
+			vty_out(vty,
+				"  BFD: Detect Multiplier: %d, Min Rx interval: %d, Min Tx interval: %d\n",
+				oi->bfd_config.detection_multiplier,
+				oi->bfd_config.min_rx, oi->bfd_config.min_tx);
+		}
+	}
+
+	if (use_json)
+		json_auth = json_object_new_object();
+	if (oi->at_data.flags != 0) {
+		if (use_json) {
+			if (CHECK_FLAG(oi->at_data.flags,
+				       OSPF6_AUTH_TRAILER_KEYCHAIN)) {
+				json_object_string_add(json_auth, "authType",
+						       "keychain");
+				json_object_string_add(json_auth,
+						       "keychainName",
+						       oi->at_data.keychain);
+			} else if (CHECK_FLAG(oi->at_data.flags,
+					      OSPF6_AUTH_TRAILER_MANUAL_KEY))
+				json_object_string_add(json_auth, "authType",
+						       "manualkey");
+			json_object_int_add(json_auth, "txPktDrop",
+					    oi->at_data.tx_drop);
+			json_object_int_add(json_auth, "rxPktDrop",
+					    oi->at_data.rx_drop);
+		} else {
+			if (CHECK_FLAG(oi->at_data.flags,
+				       OSPF6_AUTH_TRAILER_KEYCHAIN))
+				vty_out(vty,
+					"  Authentication Trailer is enabled with key-chain %s\n",
+					oi->at_data.keychain);
+			else if (CHECK_FLAG(oi->at_data.flags,
+					    OSPF6_AUTH_TRAILER_MANUAL_KEY))
+				vty_out(vty,
+					"  Authentication trailer is enabled with manual key\n");
+			vty_out(vty,
+				"    Packet drop Tx %u, Packet drop Rx %u\n",
+				oi->at_data.tx_drop, oi->at_data.rx_drop);
+		}
+	} else {
+		if (use_json)
+			json_object_string_add(json_auth, "authType", "NULL");
+		else
+			vty_out(vty, "  Authentication Trailer is disabled\n");
+	}
+
+	if (use_json)
+		json_object_object_add(json_obj, "authInfo", json_auth);
+
+	return 0;
+}
+
+/* Find the global address to be used as a forwarding address in NSSA LSA.*/
+struct in6_addr *ospf6_interface_get_global_address(struct interface *ifp)
+{
+	struct listnode *n;
+	struct connected *c;
+
+	/* for each connected address */
+	for (ALL_LIST_ELEMENTS_RO(ifp->connected, n, c)) {
+		/* if family not AF_INET6, ignore */
+		if (c->address->family != AF_INET6)
+			continue;
+
+		if (!IN6_IS_ADDR_LINKLOCAL(&c->address->u.prefix6))
+			return &c->address->u.prefix6;
+	}
+
+	return NULL;
+}
+
+
+static int show_ospf6_interface_common(struct vty *vty, vrf_id_t vrf_id,
+				       int argc, struct cmd_token **argv,
+				       int idx_ifname, int intf_idx,
+				       int json_idx, bool uj)
+{
+
+	struct vrf *vrf = vrf_lookup_by_id(vrf_id);
+	struct interface *ifp;
+	json_object *json;
+	json_object *json_int;
+
+	if (uj) {
+		json = json_object_new_object();
+		if (argc == json_idx) {
+			ifp = if_lookup_by_name(argv[idx_ifname]->arg, vrf_id);
+			json_int = json_object_new_object();
+			if (ifp == NULL) {
+				json_object_string_add(json, "noSuchInterface",
+						       argv[idx_ifname]->arg);
+				vty_json(vty, json);
+				json_object_free(json_int);
+				return CMD_WARNING;
+			}
+			ospf6_interface_show(vty, ifp, json_int, uj);
+			json_object_object_add(json, ifp->name, json_int);
+		} else {
+			FOR_ALL_INTERFACES (vrf, ifp) {
+				json_int = json_object_new_object();
+				ospf6_interface_show(vty, ifp, json_int, uj);
+				json_object_object_add(json, ifp->name,
+						       json_int);
+			}
+		}
+		vty_json(vty, json);
+	} else {
+		if (argc == intf_idx) {
+			ifp = if_lookup_by_name(argv[idx_ifname]->arg, vrf_id);
+			if (ifp == NULL) {
+				vty_out(vty, "No such Interface: %s\n",
+					argv[idx_ifname]->arg);
+				return CMD_WARNING;
+			}
+			ospf6_interface_show(vty, ifp, NULL, uj);
+		} else {
+			FOR_ALL_INTERFACES (vrf, ifp)
+				ospf6_interface_show(vty, ifp, NULL, uj);
+		}
+	}
+	return CMD_SUCCESS;
+}
+
+/* show interface */
+DEFUN(show_ipv6_ospf6_interface, show_ipv6_ospf6_interface_ifname_cmd,
+      "show ipv6 ospf6 [vrf <NAME|all>] interface [IFNAME] [json]",
+      SHOW_STR IP6_STR OSPF6_STR VRF_CMD_HELP_STR
+      "All VRFs\n" INTERFACE_STR IFNAME_STR JSON_STR)
+{
+	int idx_ifname = 4;
+	int intf_idx = 5;
+	int json_idx = 6;
+	struct listnode *node;
+	struct ospf6 *ospf6;
+	const char *vrf_name = NULL;
+	bool all_vrf = false;
+	int idx_vrf = 0;
+	bool uj = use_json(argc, argv);
+
+	OSPF6_FIND_VRF_ARGS(argv, argc, idx_vrf, vrf_name, all_vrf);
+	if (idx_vrf > 0) {
+		idx_ifname += 2;
+		intf_idx += 2;
+		json_idx += 2;
+	}
+
+	for (ALL_LIST_ELEMENTS_RO(om6->ospf6, node, ospf6)) {
+		if (all_vrf || strcmp(ospf6->name, vrf_name) == 0) {
+			show_ospf6_interface_common(vty, ospf6->vrf_id, argc,
+						    argv, idx_ifname, intf_idx,
+						    json_idx, uj);
+
+			if (!all_vrf)
+				break;
+		}
+	}
+
+	OSPF6_CMD_CHECK_VRF(uj, all_vrf, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+static int ospf6_interface_show_traffic(struct vty *vty,
+					struct interface *intf_ifp,
+					int display_once, json_object *json,
+					bool use_json, vrf_id_t vrf_id)
+{
+	struct interface *ifp;
+	struct vrf *vrf = NULL;
+	struct ospf6_interface *oi = NULL;
+	json_object *json_interface;
+
+	if (!display_once && !use_json) {
+		vty_out(vty, "\n");
+		vty_out(vty, "%-12s%-17s%-17s%-17s%-17s%-17s\n", "Interface",
+			"    HELLO", "    DB-Desc", "   LS-Req", "   LS-Update",
+			"   LS-Ack");
+		vty_out(vty, "%-10s%-18s%-18s%-17s%-17s%-17s\n", "",
+			"      Rx/Tx", "     Rx/Tx", "    Rx/Tx", "    Rx/Tx",
+			"    Rx/Tx");
+		vty_out(vty,
+			"--------------------------------------------------------------------------------------------\n");
+	}
+
+	if (intf_ifp == NULL) {
+		vrf = vrf_lookup_by_id(vrf_id);
+		FOR_ALL_INTERFACES (vrf, ifp) {
+			if (ifp->info)
+				oi = (struct ospf6_interface *)ifp->info;
+			else
+				continue;
+
+			if (use_json) {
+				json_interface = json_object_new_object();
+				json_object_int_add(json_interface, "helloRx",
+						    oi->hello_in);
+				json_object_int_add(json_interface, "helloTx",
+						    oi->hello_out);
+				json_object_int_add(json_interface, "dbDescRx",
+						    oi->db_desc_in);
+				json_object_int_add(json_interface, "dbDescTx",
+						    oi->db_desc_out);
+				json_object_int_add(json_interface, "lsReqRx",
+						    oi->ls_req_in);
+				json_object_int_add(json_interface, "lsReqTx",
+						    oi->ls_req_out);
+				json_object_int_add(json_interface,
+						    "lsUpdateRx",
+						    oi->ls_upd_in);
+				json_object_int_add(json_interface,
+						    "lsUpdateTx",
+						    oi->ls_upd_out);
+				json_object_int_add(json_interface, "lsAckRx",
+						    oi->ls_ack_in);
+				json_object_int_add(json_interface, "lsAckTx",
+						    oi->ls_ack_out);
+
+				json_object_object_add(json,
+						       oi->interface->name,
+						       json_interface);
+			} else
+				vty_out(vty,
+					"%-10s %8u/%-8u %7u/%-7u %7u/%-7u %7u/%-7u %7u/%-7u\n",
+					oi->interface->name, oi->hello_in,
+					oi->hello_out, oi->db_desc_in,
+					oi->db_desc_out, oi->ls_req_in,
+					oi->ls_req_out, oi->ls_upd_in,
+					oi->ls_upd_out, oi->ls_ack_in,
+					oi->ls_ack_out);
+		}
+	} else {
+		oi = intf_ifp->info;
+		if (oi == NULL)
+			return CMD_WARNING;
+
+		if (use_json) {
+			json_interface = json_object_new_object();
+			json_object_int_add(json_interface, "helloRx",
+					    oi->hello_in);
+			json_object_int_add(json_interface, "helloTx",
+					    oi->hello_out);
+			json_object_int_add(json_interface, "dbDescRx",
+					    oi->db_desc_in);
+			json_object_int_add(json_interface, "dbDescTx",
+					    oi->db_desc_out);
+			json_object_int_add(json_interface, "lsReqRx",
+					    oi->ls_req_in);
+			json_object_int_add(json_interface, "lsReqTx",
+					    oi->ls_req_out);
+			json_object_int_add(json_interface, "lsUpdateRx",
+					    oi->ls_upd_in);
+			json_object_int_add(json_interface, "lsUpdateTx",
+					    oi->ls_upd_out);
+			json_object_int_add(json_interface, "lsAckRx",
+					    oi->ls_ack_in);
+			json_object_int_add(json_interface, "lsAckTx",
+					    oi->ls_ack_out);
+
+			json_object_object_add(json, oi->interface->name,
+					       json_interface);
+		} else
+			vty_out(vty,
+				"%-10s %8u/%-8u %7u/%-7u %7u/%-7u %7u/%-7u %7u/%-7u\n",
+				oi->interface->name, oi->hello_in,
+				oi->hello_out, oi->db_desc_in, oi->db_desc_out,
+				oi->ls_req_in, oi->ls_req_out, oi->ls_upd_in,
+				oi->ls_upd_out, oi->ls_ack_in, oi->ls_ack_out);
+	}
+
+	return CMD_SUCCESS;
+}
+
+static int ospf6_interface_show_traffic_common(struct vty *vty, int argc,
+					       struct cmd_token **argv,
+					       vrf_id_t vrf_id, bool uj)
+{
+	int idx_ifname = 0;
+	int display_once = 0;
+	char *intf_name = NULL;
+	struct interface *ifp = NULL;
+	json_object *json = NULL;
+
+	if (uj)
+		json = json_object_new_object();
+
+	if (argv_find(argv, argc, "IFNAME", &idx_ifname)) {
+		intf_name = argv[idx_ifname]->arg;
+		ifp = if_lookup_by_name(intf_name, vrf_id);
+		if (uj) {
+			if (ifp == NULL) {
+				json_object_string_add(json, "status",
+						       "No Such Interface");
+				json_object_string_add(json, "interface",
+						       intf_name);
+				vty_json(vty, json);
+				return CMD_WARNING;
+			}
+			if (ifp->info == NULL) {
+				json_object_string_add(
+					json, "status",
+					"OSPF not enabled on this interface");
+				json_object_string_add(json, "interface",
+						       intf_name);
+				vty_json(vty, json);
+				return 0;
+			}
+		} else {
+			if (ifp == NULL) {
+				vty_out(vty, "No such Interface: %s\n",
+					intf_name);
+				return CMD_WARNING;
+			}
+			if (ifp->info == NULL) {
+				vty_out(vty,
+					"   OSPF not enabled on this interface %s\n",
+					intf_name);
+				return 0;
+			}
+		}
+	}
+
+	ospf6_interface_show_traffic(vty, ifp, display_once, json, uj, vrf_id);
+
+	if (uj)
+		vty_json(vty, json);
+
+	return CMD_SUCCESS;
+}
+
+/* show interface */
+DEFUN(show_ipv6_ospf6_interface_traffic, show_ipv6_ospf6_interface_traffic_cmd,
+      "show ipv6 ospf6 [vrf <NAME|all>] interface traffic [IFNAME] [json]",
+      SHOW_STR IP6_STR OSPF6_STR VRF_CMD_HELP_STR
+      "All VRFs\n" INTERFACE_STR
+      "Protocol Packet counters\n" IFNAME_STR 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);
+
+	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_interface_show_traffic_common(vty, argc, argv,
+							    ospf6->vrf_id, uj);
+
+			if (!all_vrf)
+				break;
+		}
+	}
+
+	OSPF6_CMD_CHECK_VRF(uj, all_vrf, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+
+DEFUN(show_ipv6_ospf6_interface_ifname_prefix,
+      show_ipv6_ospf6_interface_ifname_prefix_cmd,
+      "show ipv6 ospf6 [vrf <NAME|all>] interface IFNAME prefix\
+          [<\
+	    detail\
+	    |<X:X::X:X|X:X::X:X/M> [<match|detail>]\
+	  >] [json]",
+      SHOW_STR IP6_STR OSPF6_STR VRF_CMD_HELP_STR
+      "All VRFs\n" INTERFACE_STR IFNAME_STR
+      "Display connected prefixes to advertise\n"
+      "Display details of the prefixes\n" OSPF6_ROUTE_ADDRESS_STR
+	      OSPF6_ROUTE_PREFIX_STR OSPF6_ROUTE_MATCH_STR
+      "Display details of the prefixes\n" JSON_STR)
+{
+	int idx_ifname = 4;
+	int idx_prefix = 6;
+	struct ospf6_interface *oi;
+	bool uj = use_json(argc, argv);
+
+	struct ospf6 *ospf6;
+	struct listnode *node;
+	struct interface *ifp;
+	const char *vrf_name = NULL;
+	bool all_vrf = false;
+	int idx_vrf = 0;
+
+	OSPF6_FIND_VRF_ARGS(argv, argc, idx_vrf, vrf_name, all_vrf);
+	if (idx_vrf > 0) {
+		idx_ifname += 2;
+		idx_prefix += 2;
+	}
+
+	for (ALL_LIST_ELEMENTS_RO(om6->ospf6, node, ospf6)) {
+		if (all_vrf || strcmp(ospf6->name, vrf_name) == 0) {
+			ifp = if_lookup_by_name(argv[idx_ifname]->arg,
+						ospf6->vrf_id);
+			if (ifp == NULL) {
+				vty_out(vty, "No such Interface: %s\n",
+					argv[idx_ifname]->arg);
+				return CMD_WARNING;
+			}
+
+			oi = ifp->info;
+			if (oi == NULL
+			    || CHECK_FLAG(oi->flag, OSPF6_INTERFACE_DISABLE)) {
+				vty_out(vty,
+					"Interface %s not attached to area\n",
+					argv[idx_ifname]->arg);
+				return CMD_WARNING;
+			}
+
+			ospf6_route_table_show(vty, idx_prefix, argc, argv,
+					       oi->route_connected, uj);
+
+			if (!all_vrf)
+				break;
+		}
+	}
+
+	OSPF6_CMD_CHECK_VRF(uj, all_vrf, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(show_ipv6_ospf6_interface_prefix, show_ipv6_ospf6_interface_prefix_cmd,
+      "show ipv6 ospf6 [vrf <NAME|all>] interface prefix\
+          [<\
+	    detail\
+	    |<X:X::X:X|X:X::X:X/M> [<match|detail>]\
+	  >] [json]",
+      SHOW_STR IP6_STR OSPF6_STR VRF_CMD_HELP_STR
+      "All VRFs\n" INTERFACE_STR
+      "Display connected prefixes to advertise\n"
+      "Display details of the prefixes\n" OSPF6_ROUTE_ADDRESS_STR
+	      OSPF6_ROUTE_PREFIX_STR OSPF6_ROUTE_MATCH_STR
+      "Display details of the prefixes\n" JSON_STR)
+{
+	struct vrf *vrf = NULL;
+	int idx_prefix = 5;
+	struct ospf6_interface *oi;
+	struct interface *ifp;
+	bool uj = use_json(argc, argv);
+	struct listnode *node;
+	struct ospf6 *ospf6;
+	const char *vrf_name = NULL;
+	bool all_vrf = false;
+	int idx_vrf = 0;
+
+	OSPF6_FIND_VRF_ARGS(argv, argc, idx_vrf, vrf_name, all_vrf);
+	if (idx_vrf > 0)
+		idx_prefix += 2;
+
+	for (ALL_LIST_ELEMENTS_RO(om6->ospf6, node, ospf6)) {
+		if (all_vrf || strcmp(ospf6->name, vrf_name) == 0) {
+			vrf = vrf_lookup_by_id(ospf6->vrf_id);
+			FOR_ALL_INTERFACES (vrf, ifp) {
+				oi = (struct ospf6_interface *)ifp->info;
+				if (oi == NULL
+				    || CHECK_FLAG(oi->flag,
+						  OSPF6_INTERFACE_DISABLE))
+					continue;
+
+				ospf6_route_table_show(vty, idx_prefix, argc,
+						       argv,
+						       oi->route_connected, uj);
+			}
+			if (!all_vrf)
+				break;
+		}
+	}
+
+	OSPF6_CMD_CHECK_VRF(uj, all_vrf, ospf6);
+
+	return CMD_SUCCESS;
+}
+
+void ospf6_interface_start(struct ospf6_interface *oi)
+{
+	struct ospf6 *ospf6;
+	struct ospf6_area *oa;
+
+	if (oi->area_id_format == OSPF6_AREA_FMT_UNSET)
+		return;
+
+	if (oi->area) {
+		/* Recompute cost */
+		ospf6_interface_recalculate_cost(oi);
+		return;
+	}
+
+	ospf6 = oi->interface->vrf->info;
+	if (!ospf6)
+		return;
+
+	oa = ospf6_area_lookup(oi->area_id, ospf6);
+	if (oa == NULL)
+		oa = ospf6_area_create(oi->area_id, ospf6, oi->area_id_format);
+
+	/* attach interface to area */
+	listnode_add(oa->if_list, oi);
+	oi->area = oa;
+
+	SET_FLAG(oa->flag, OSPF6_AREA_ENABLE);
+
+	/* 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(ospf6);
+	}
+}
+
+void ospf6_interface_stop(struct ospf6_interface *oi)
+{
+	struct ospf6_area *oa;
+
+	oa = oi->area;
+	if (!oa)
+		return;
+
+	ospf6_interface_disable(oi);
+
+	listnode_delete(oa->if_list, oi);
+	oi->area = NULL;
+
+	if (oa->if_list->count == 0) {
+		UNSET_FLAG(oa->flag, OSPF6_AREA_ENABLE);
+		ospf6_abr_disable_area(oa);
+	}
+}
+
+/* interface variable set command */
+DEFUN (ipv6_ospf6_area,
+       ipv6_ospf6_area_cmd,
+       "ipv6 ospf6 area <A.B.C.D|(0-4294967295)>",
+       IP6_STR
+       OSPF6_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(interface, ifp);
+	struct ospf6_interface *oi;
+	int idx_ipv4 = 3;
+	uint32_t area_id;
+	int format;
+
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	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;
+
+	ospf6_interface_start(oi);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_ospf6_area,
+       no_ipv6_ospf6_area_cmd,
+       "no ipv6 ospf6 area [<A.B.C.D|(0-4294967295)>]",
+       NO_STR
+       IP6_STR
+       OSPF6_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(interface, ifp);
+	struct ospf6_interface *oi;
+
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	ospf6_interface_stop(oi);
+
+	oi->area_id = 0;
+	oi->area_id_format = OSPF6_AREA_FMT_UNSET;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (ipv6_ospf6_ifmtu,
+       ipv6_ospf6_ifmtu_cmd,
+       "ipv6 ospf6 ifmtu (1-65535)",
+       IP6_STR
+       OSPF6_STR
+       "Interface MTU\n"
+       "OSPFv3 Interface MTU\n"
+       )
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_number = 3;
+	struct ospf6_interface *oi;
+	unsigned int ifmtu, iobuflen;
+	struct listnode *node, *nnode;
+	struct ospf6_neighbor *on;
+
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	ifmtu = strtol(argv[idx_number]->arg, NULL, 10);
+
+	if (oi->c_ifmtu == ifmtu)
+		return CMD_SUCCESS;
+
+	if (ifp->mtu6 != 0 && ifp->mtu6 < ifmtu) {
+		vty_out(vty,
+			"%s's ospf6 ifmtu cannot go beyond physical mtu (%d)\n",
+			ifp->name, ifp->mtu6);
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	if (oi->ifmtu < ifmtu) {
+		iobuflen = ospf6_iobuf_size(ifmtu);
+		if (iobuflen < ifmtu) {
+			vty_out(vty,
+				"%s's ifmtu is adjusted to I/O buffer size (%d).\n",
+				ifp->name, iobuflen);
+			oi->ifmtu = oi->c_ifmtu = iobuflen;
+		} else
+			oi->ifmtu = oi->c_ifmtu = ifmtu;
+	} else
+		oi->ifmtu = oi->c_ifmtu = ifmtu;
+
+	/* re-establish adjacencies */
+	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on)) {
+		EVENT_OFF(on->inactivity_timer);
+		event_add_event(master, inactivity_timer, on, 0, NULL);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_ospf6_ifmtu,
+       no_ipv6_ospf6_ifmtu_cmd,
+       "no ipv6 ospf6 ifmtu [(1-65535)]",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Interface MTU\n"
+       "OSPFv3 Interface MTU\n"
+       )
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	unsigned int iobuflen;
+	struct listnode *node, *nnode;
+	struct ospf6_neighbor *on;
+
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	if (oi->ifmtu < ifp->mtu) {
+		iobuflen = ospf6_iobuf_size(ifp->mtu);
+		if (iobuflen < ifp->mtu) {
+			vty_out(vty,
+				"%s's ifmtu is adjusted to I/O buffer size (%d).\n",
+				ifp->name, iobuflen);
+			oi->ifmtu = iobuflen;
+		} else
+			oi->ifmtu = ifp->mtu;
+	} else
+		oi->ifmtu = ifp->mtu;
+
+	oi->c_ifmtu = 0;
+
+	/* re-establish adjacencies */
+	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on)) {
+		EVENT_OFF(on->inactivity_timer);
+		event_add_event(master, inactivity_timer, on, 0, NULL);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (ipv6_ospf6_cost,
+       ipv6_ospf6_cost_cmd,
+       "ipv6 ospf6 cost (1-65535)",
+       IP6_STR
+       OSPF6_STR
+       "Interface cost\n"
+       "Outgoing metric of this interface\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_number = 3;
+	struct ospf6_interface *oi;
+	unsigned long int lcost;
+
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	lcost = strtol(argv[idx_number]->arg, NULL, 10);
+
+	if (lcost > UINT32_MAX) {
+		vty_out(vty, "Cost %ld is out of range\n", lcost);
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	SET_FLAG(oi->flag, OSPF6_INTERFACE_NOAUTOCOST);
+	if (oi->cost == lcost)
+		return CMD_SUCCESS;
+
+	oi->cost = lcost;
+	ospf6_interface_force_recalculate_cost(oi);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_ospf6_cost,
+       no_ipv6_ospf6_cost_cmd,
+       "no ipv6 ospf6 cost [(1-65535)]",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Calculate interface cost from bandwidth\n"
+       "Outgoing metric of this interface\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	UNSET_FLAG(oi->flag, OSPF6_INTERFACE_NOAUTOCOST);
+
+	ospf6_interface_recalculate_cost(oi);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (auto_cost_reference_bandwidth,
+       auto_cost_reference_bandwidth_cmd,
+       "auto-cost reference-bandwidth (1-4294967)",
+       "Calculate OSPF interface cost according to bandwidth\n"
+       "Use reference bandwidth method to assign OSPF cost\n"
+       "The reference bandwidth in terms of Mbits per second\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, o);
+	int idx_number = 2;
+	struct ospf6_area *oa;
+	struct ospf6_interface *oi;
+	struct listnode *i, *j;
+	uint32_t refbw;
+
+	refbw = strtol(argv[idx_number]->arg, NULL, 10);
+	if (refbw < 1 || refbw > 4294967) {
+		vty_out(vty, "reference-bandwidth value is invalid\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	/* If reference bandwidth is changed. */
+	if ((refbw) == o->ref_bandwidth)
+		return CMD_SUCCESS;
+
+	o->ref_bandwidth = refbw;
+	for (ALL_LIST_ELEMENTS_RO(o->area_list, i, oa))
+		for (ALL_LIST_ELEMENTS_RO(oa->if_list, j, oi))
+			ospf6_interface_recalculate_cost(oi);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_auto_cost_reference_bandwidth,
+       no_auto_cost_reference_bandwidth_cmd,
+       "no auto-cost reference-bandwidth [(1-4294967)]",
+       NO_STR
+       "Calculate OSPF interface cost according to bandwidth\n"
+       "Use reference bandwidth method to assign OSPF cost\n"
+       "The reference bandwidth in terms of Mbits per second\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, o);
+	struct ospf6_area *oa;
+	struct ospf6_interface *oi;
+	struct listnode *i, *j;
+
+	if (o->ref_bandwidth == OSPF6_REFERENCE_BANDWIDTH)
+		return CMD_SUCCESS;
+
+	o->ref_bandwidth = OSPF6_REFERENCE_BANDWIDTH;
+	for (ALL_LIST_ELEMENTS_RO(o->area_list, i, oa))
+		for (ALL_LIST_ELEMENTS_RO(oa->if_list, j, oi))
+			ospf6_interface_recalculate_cost(oi);
+
+	return CMD_SUCCESS;
+}
+
+
+DEFUN (ospf6_write_multiplier,
+       ospf6_write_multiplier_cmd,
+       "write-multiplier (1-100)",
+       "Write multiplier\n"
+       "Maximum number of interface serviced per write\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, o);
+	uint32_t write_oi_count;
+
+	write_oi_count = strtol(argv[1]->arg, NULL, 10);
+	if (write_oi_count < 1 || write_oi_count > 100) {
+		vty_out(vty, "write-multiplier value is invalid\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	o->write_oi_count = write_oi_count;
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ospf6_write_multiplier,
+       no_ospf6_write_multiplier_cmd,
+       "no write-multiplier (1-100)",
+       NO_STR
+       "Write multiplier\n"
+       "Maximum number of interface serviced per write\n")
+{
+	VTY_DECLVAR_CONTEXT(ospf6, o);
+
+	o->write_oi_count = OSPF6_WRITE_INTERFACE_COUNT_DEFAULT;
+	return CMD_SUCCESS;
+}
+
+DEFUN (ipv6_ospf6_hellointerval,
+       ipv6_ospf6_hellointerval_cmd,
+       "ipv6 ospf6 hello-interval (1-65535)",
+       IP6_STR
+       OSPF6_STR
+       "Time between HELLO packets\n"
+       SECONDS_STR)
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_number = 3;
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->hello_interval = strmatch(argv[0]->text, "no")
+				     ? OSPF_HELLO_INTERVAL_DEFAULT
+				     : strtoul(argv[idx_number]->arg, NULL, 10);
+
+	/*
+	 * If the thread is scheduled, send the new hello now.
+	 */
+	if (event_is_scheduled(oi->thread_send_hello)) {
+		EVENT_OFF(oi->thread_send_hello);
+
+		event_add_timer(master, ospf6_hello_send, oi, 0,
+				&oi->thread_send_hello);
+	}
+	return CMD_SUCCESS;
+}
+
+ALIAS (ipv6_ospf6_hellointerval,
+       no_ipv6_ospf6_hellointerval_cmd,
+       "no ipv6 ospf6 hello-interval [(1-65535)]",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Time between HELLO packets\n"
+       SECONDS_STR)
+
+/* interface variable set command */
+DEFUN (ipv6_ospf6_deadinterval,
+       ipv6_ospf6_deadinterval_cmd,
+       "ipv6 ospf6 dead-interval (1-65535)",
+       IP6_STR
+       OSPF6_STR
+       "Interval time after which a neighbor is declared down\n"
+       SECONDS_STR)
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_number = 3;
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->dead_interval = strmatch(argv[0]->arg, "no")
+				    ? OSPF_ROUTER_DEAD_INTERVAL_DEFAULT
+				    : strtoul(argv[idx_number]->arg, NULL, 10);
+	return CMD_SUCCESS;
+}
+
+ALIAS (ipv6_ospf6_deadinterval,
+       no_ipv6_ospf6_deadinterval_cmd,
+       "no ipv6 ospf6 dead-interval [(1-65535)]",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Interval time after which a neighbor is declared down\n"
+       SECONDS_STR)
+
+DEFPY(ipv6_ospf6_gr_hdelay, ipv6_ospf6_gr_hdelay_cmd,
+      "ipv6 ospf6 graceful-restart hello-delay (1-1800)",
+      IP6_STR
+      OSPF6_STR
+      "Graceful Restart parameters\n"
+      "Delay the sending of the first hello packets.\n"
+      "Delay in seconds\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+
+	oi = ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+
+	/* Note: new or updated value won't affect ongoing graceful restart. */
+	oi->gr.hello_delay.interval = hello_delay;
+
+	return CMD_SUCCESS;
+}
+
+DEFPY(no_ipv6_ospf6_gr_hdelay, no_ipv6_ospf6_gr_hdelay_cmd,
+      "no ipv6 ospf6 graceful-restart hello-delay [(1-1800)]",
+      NO_STR
+      IP6_STR
+      OSPF6_STR
+      "Graceful Restart parameters\n"
+      "Delay the sending of the first hello packets.\n"
+      "Delay in seconds\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+
+	oi = ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+
+	oi->gr.hello_delay.interval = OSPF_HELLO_DELAY_DEFAULT;
+	oi->gr.hello_delay.elapsed_seconds = 0;
+	EVENT_OFF(oi->gr.hello_delay.t_grace_send);
+
+	return CMD_SUCCESS;
+}
+
+/* interface variable set command */
+DEFUN (ipv6_ospf6_transmitdelay,
+       ipv6_ospf6_transmitdelay_cmd,
+       "ipv6 ospf6 transmit-delay (1-3600)",
+       IP6_STR
+       OSPF6_STR
+       "Link state transmit delay\n"
+       SECONDS_STR)
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_number = 3;
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->transdelay = strmatch(argv[0]->text, "no")
+				 ? OSPF6_INTERFACE_TRANSDELAY
+				 : strtoul(argv[idx_number]->arg, NULL, 10);
+	return CMD_SUCCESS;
+}
+
+ALIAS (ipv6_ospf6_transmitdelay,
+       no_ipv6_ospf6_transmitdelay_cmd,
+       "no ipv6 ospf6 transmit-delay [(1-3600)]",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Link state transmit delay\n"
+       SECONDS_STR)
+
+/* interface variable set command */
+DEFUN (ipv6_ospf6_retransmitinterval,
+       ipv6_ospf6_retransmitinterval_cmd,
+       "ipv6 ospf6 retransmit-interval (1-65535)",
+       IP6_STR
+       OSPF6_STR
+       "Time between retransmitting lost link state advertisements\n"
+       SECONDS_STR)
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_number = 3;
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->rxmt_interval = strmatch(argv[0]->text, "no")
+				    ? OSPF_RETRANSMIT_INTERVAL_DEFAULT
+				    : strtoul(argv[idx_number]->arg, NULL, 10);
+	return CMD_SUCCESS;
+}
+
+ALIAS (ipv6_ospf6_retransmitinterval,
+       no_ipv6_ospf6_retransmitinterval_cmd,
+       "no ipv6 ospf6 retransmit-interval [(1-65535)]",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Time between retransmitting lost link state advertisements\n"
+       SECONDS_STR)
+
+/* interface variable set command */
+DEFUN (ipv6_ospf6_priority,
+       ipv6_ospf6_priority_cmd,
+       "ipv6 ospf6 priority (0-255)",
+       IP6_STR
+       OSPF6_STR
+       "Router priority\n"
+       "Priority value\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_number = 3;
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->priority = strmatch(argv[0]->text, "no")
+			       ? OSPF6_INTERFACE_PRIORITY
+			       : strtoul(argv[idx_number]->arg, NULL, 10);
+
+	if (oi->area
+	    && (oi->state == OSPF6_INTERFACE_DROTHER
+		|| oi->state == OSPF6_INTERFACE_BDR
+		|| oi->state == OSPF6_INTERFACE_DR)) {
+		if (ospf6_interface_state_change(dr_election(oi), oi) == -1)
+			OSPF6_LINK_LSA_SCHEDULE(oi);
+	}
+
+	return CMD_SUCCESS;
+}
+
+ALIAS (ipv6_ospf6_priority,
+       no_ipv6_ospf6_priority_cmd,
+       "no ipv6 ospf6 priority [(0-255)]",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Router priority\n"
+       "Priority value\n")
+
+DEFUN (ipv6_ospf6_instance,
+       ipv6_ospf6_instance_cmd,
+       "ipv6 ospf6 instance-id (0-255)",
+       IP6_STR
+       OSPF6_STR
+       "Instance ID for this interface\n"
+       "Instance ID value\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_number = 3;
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->instance_id = strmatch(argv[0]->text, "no")
+				  ? OSPF6_INTERFACE_INSTANCE_ID
+				  : strtoul(argv[idx_number]->arg, NULL, 10);
+	return CMD_SUCCESS;
+}
+
+ALIAS (ipv6_ospf6_instance,
+       no_ipv6_ospf6_instance_cmd,
+       "no ipv6 ospf6 instance-id [(0-255)]",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Instance ID for this interface\n"
+       "Instance ID value\n")
+
+DEFUN (ipv6_ospf6_passive,
+       ipv6_ospf6_passive_cmd,
+       "ipv6 ospf6 passive",
+       IP6_STR
+       OSPF6_STR
+       "Passive interface; no adjacency will be formed on this interface\n"
+       )
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	struct listnode *node, *nnode;
+	struct ospf6_neighbor *on;
+
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	SET_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE);
+	EVENT_OFF(oi->thread_send_hello);
+	EVENT_OFF(oi->thread_sso);
+
+	for (ALL_LIST_ELEMENTS(oi->neighbor_list, node, nnode, on)) {
+		EVENT_OFF(on->inactivity_timer);
+		event_add_event(master, inactivity_timer, on, 0, NULL);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_ospf6_passive,
+       no_ipv6_ospf6_passive_cmd,
+       "no ipv6 ospf6 passive",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "passive interface: No Adjacency will be formed on this I/F\n"
+       )
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	UNSET_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE);
+	EVENT_OFF(oi->thread_send_hello);
+	EVENT_OFF(oi->thread_sso);
+
+	/* don't send hellos over loopback interface */
+	if (!if_is_loopback(oi->interface))
+		event_add_timer(master, ospf6_hello_send, oi, 0,
+				&oi->thread_send_hello);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (ipv6_ospf6_mtu_ignore,
+       ipv6_ospf6_mtu_ignore_cmd,
+       "ipv6 ospf6 mtu-ignore",
+       IP6_STR
+       OSPF6_STR
+       "Disable MTU mismatch detection on this interface\n"
+       )
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->mtu_ignore = 1;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_ospf6_mtu_ignore,
+       no_ipv6_ospf6_mtu_ignore_cmd,
+       "no ipv6 ospf6 mtu-ignore",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Disable MTU mismatch detection on this interface\n"
+       )
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	oi->mtu_ignore = 0;
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (ipv6_ospf6_advertise_prefix_list,
+       ipv6_ospf6_advertise_prefix_list_cmd,
+       "ipv6 ospf6 advertise prefix-list WORD",
+       IP6_STR
+       OSPF6_STR
+       "Advertising options\n"
+       "Filter prefix using prefix-list\n"
+       "Prefix list name\n"
+       )
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_word = 4;
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	if (oi->plist_name)
+		XFREE(MTYPE_CFG_PLIST_NAME, oi->plist_name);
+	oi->plist_name = XSTRDUP(MTYPE_CFG_PLIST_NAME, argv[idx_word]->arg);
+
+	ospf6_interface_connected_route_update(oi->interface);
+
+	if (oi->area) {
+		OSPF6_LINK_LSA_SCHEDULE(oi);
+		if (oi->state == OSPF6_INTERFACE_DR) {
+			OSPF6_NETWORK_LSA_SCHEDULE(oi);
+			OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
+		}
+		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_ospf6_advertise_prefix_list,
+       no_ipv6_ospf6_advertise_prefix_list_cmd,
+       "no ipv6 ospf6 advertise prefix-list [WORD]",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Advertising options\n"
+       "Filter prefix using prefix-list\n"
+       "Prefix list name\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+	assert(oi);
+
+	if (oi->plist_name)
+		XFREE(MTYPE_CFG_PLIST_NAME, oi->plist_name);
+
+	ospf6_interface_connected_route_update(oi->interface);
+
+	if (oi->area) {
+		OSPF6_LINK_LSA_SCHEDULE(oi);
+		if (oi->state == OSPF6_INTERFACE_DR) {
+			OSPF6_NETWORK_LSA_SCHEDULE(oi);
+			OSPF6_INTRA_PREFIX_LSA_SCHEDULE_TRANSIT(oi);
+		}
+		OSPF6_INTRA_PREFIX_LSA_SCHEDULE_STUB(oi->area);
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (ipv6_ospf6_network,
+       ipv6_ospf6_network_cmd,
+       "ipv6 ospf6 network <broadcast|point-to-point>",
+       IP6_STR
+       OSPF6_STR
+       "Network type\n"
+       "Specify OSPF6 broadcast network\n"
+       "Specify OSPF6 point-to-point network\n"
+       )
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int idx_network = 3;
+	struct ospf6_interface *oi;
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL) {
+		oi = ospf6_interface_create(ifp);
+	}
+	assert(oi);
+
+	oi->type_cfg = true;
+
+	if (strncmp(argv[idx_network]->arg, "b", 1) == 0) {
+		if (oi->type == OSPF_IFTYPE_BROADCAST)
+			return CMD_SUCCESS;
+
+		oi->type = OSPF_IFTYPE_BROADCAST;
+	} else if (strncmp(argv[idx_network]->arg, "point-to-p", 10) == 0) {
+		if (oi->type == OSPF_IFTYPE_POINTOPOINT) {
+			return CMD_SUCCESS;
+		}
+		oi->type = OSPF_IFTYPE_POINTOPOINT;
+	}
+
+	/* Reset the interface */
+	event_execute(master, interface_down, oi, 0, NULL);
+	event_execute(master, interface_up, oi, 0, NULL);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_ipv6_ospf6_network,
+       no_ipv6_ospf6_network_cmd,
+       "no ipv6 ospf6 network [<broadcast|point-to-point>]",
+       NO_STR
+       IP6_STR
+       OSPF6_STR
+       "Set default network type\n"
+       "Specify OSPF6 broadcast network\n"
+       "Specify OSPF6 point-to-point network\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+	int type;
+
+	assert(ifp);
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL) {
+		return CMD_SUCCESS;
+	}
+
+	oi->type_cfg = false;
+
+	type = ospf6_default_iftype(ifp);
+	if (oi->type == type) {
+		return CMD_SUCCESS;
+	}
+	oi->type = type;
+
+	/* Reset the interface */
+	event_execute(master, interface_down, oi, 0, NULL);
+	event_execute(master, interface_up, oi, 0, NULL);
+
+	return CMD_SUCCESS;
+}
+
+static int config_write_ospf6_interface(struct vty *vty, struct vrf *vrf)
+{
+	struct ospf6_interface *oi;
+	struct interface *ifp;
+	char buf[INET_ADDRSTRLEN];
+
+	FOR_ALL_INTERFACES (vrf, ifp) {
+		oi = (struct ospf6_interface *)ifp->info;
+		if (oi == NULL)
+			continue;
+
+		if_vty_config_start(vty, ifp);
+
+		if (ifp->desc)
+			vty_out(vty, " description %s\n", ifp->desc);
+		if (oi->area_id_format != OSPF6_AREA_FMT_UNSET) {
+			area_id2str(buf, sizeof(buf), oi->area_id,
+				    oi->area_id_format);
+			vty_out(vty, " ipv6 ospf6 area %s\n", buf);
+		}
+		if (oi->c_ifmtu)
+			vty_out(vty, " ipv6 ospf6 ifmtu %d\n", oi->c_ifmtu);
+
+		if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_NOAUTOCOST))
+			vty_out(vty, " ipv6 ospf6 cost %d\n", oi->cost);
+
+		if (oi->hello_interval != OSPF6_INTERFACE_HELLO_INTERVAL)
+			vty_out(vty, " ipv6 ospf6 hello-interval %d\n",
+				oi->hello_interval);
+
+		if (oi->dead_interval != OSPF6_INTERFACE_DEAD_INTERVAL)
+			vty_out(vty, " ipv6 ospf6 dead-interval %d\n",
+				oi->dead_interval);
+
+		if (oi->rxmt_interval != OSPF6_INTERFACE_RXMT_INTERVAL)
+			vty_out(vty, " ipv6 ospf6 retransmit-interval %d\n",
+				oi->rxmt_interval);
+
+		if (oi->priority != OSPF6_INTERFACE_PRIORITY)
+			vty_out(vty, " ipv6 ospf6 priority %d\n", oi->priority);
+
+		if (oi->transdelay != OSPF6_INTERFACE_TRANSDELAY)
+			vty_out(vty, " ipv6 ospf6 transmit-delay %d\n",
+				oi->transdelay);
+
+		if (oi->instance_id != OSPF6_INTERFACE_INSTANCE_ID)
+			vty_out(vty, " ipv6 ospf6 instance-id %d\n",
+				oi->instance_id);
+
+		if (oi->plist_name)
+			vty_out(vty, " ipv6 ospf6 advertise prefix-list %s\n",
+				oi->plist_name);
+
+		if (CHECK_FLAG(oi->flag, OSPF6_INTERFACE_PASSIVE))
+			vty_out(vty, " ipv6 ospf6 passive\n");
+
+		if (oi->mtu_ignore)
+			vty_out(vty, " ipv6 ospf6 mtu-ignore\n");
+
+		if (oi->type_cfg && oi->type == OSPF_IFTYPE_POINTOPOINT)
+			vty_out(vty, " ipv6 ospf6 network point-to-point\n");
+		else if (oi->type_cfg && oi->type == OSPF_IFTYPE_BROADCAST)
+			vty_out(vty, " ipv6 ospf6 network broadcast\n");
+
+		if (oi->gr.hello_delay.interval != OSPF_HELLO_DELAY_DEFAULT)
+			vty_out(vty,
+				" ipv6 ospf6 graceful-restart hello-delay %u\n",
+				oi->gr.hello_delay.interval);
+
+		ospf6_bfd_write_config(vty, oi);
+
+		ospf6_auth_write_config(vty, &oi->at_data);
+		if_vty_config_end(vty);
+	}
+	return 0;
+}
+
+/* Configuration write function for ospfd. */
+static int config_write_interface(struct vty *vty)
+{
+	int write = 0;
+	struct vrf *vrf = NULL;
+
+	/* Display all VRF aware OSPF interface configuration */
+	RB_FOREACH (vrf, vrf_name_head, &vrfs_by_name) {
+		write += config_write_ospf6_interface(vty, vrf);
+	}
+
+	return write;
+}
+
+static int ospf6_ifp_create(struct interface *ifp)
+{
+	if (IS_OSPF6_DEBUG_ZEBRA(RECV))
+		zlog_debug("Zebra Interface add: %s index %d mtu %d", ifp->name,
+			   ifp->ifindex, ifp->mtu6);
+
+	if (ifp->info)
+		ospf6_interface_start(ifp->info);
+
+	return 0;
+}
+
+static int ospf6_ifp_up(struct interface *ifp)
+{
+	if (IS_OSPF6_DEBUG_ZEBRA(RECV))
+		zlog_debug(
+			"Zebra Interface state change: %s index %d flags %llx metric %d mtu %d bandwidth %d",
+			ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
+			ifp->metric, ifp->mtu6, ifp->bandwidth);
+
+	ospf6_interface_state_update(ifp);
+
+	return 0;
+}
+
+static int ospf6_ifp_down(struct interface *ifp)
+{
+	if (IS_OSPF6_DEBUG_ZEBRA(RECV))
+		zlog_debug(
+			"Zebra Interface state change: %s index %d flags %llx metric %d mtu %d bandwidth %d",
+			ifp->name, ifp->ifindex, (unsigned long long)ifp->flags,
+			ifp->metric, ifp->mtu6, ifp->bandwidth);
+
+	ospf6_interface_state_update(ifp);
+
+	return 0;
+}
+
+static int ospf6_ifp_destroy(struct interface *ifp)
+{
+	if (if_is_up(ifp))
+		zlog_warn("Zebra: got delete of %s, but interface is still up",
+			  ifp->name);
+
+	if (IS_OSPF6_DEBUG_ZEBRA(RECV))
+		zlog_debug("Zebra Interface delete: %s index %d mtu %d",
+			   ifp->name, ifp->ifindex, ifp->mtu6);
+
+	if (ifp->info)
+		ospf6_interface_stop(ifp->info);
+
+	return 0;
+}
+
+void ospf6_interface_init(void)
+{
+	/* Install interface node. */
+	if_cmd_init(config_write_interface);
+	if_zapi_callbacks(ospf6_ifp_create, ospf6_ifp_up,
+			  ospf6_ifp_down, ospf6_ifp_destroy);
+
+	install_element(VIEW_NODE, &show_ipv6_ospf6_interface_prefix_cmd);
+	install_element(VIEW_NODE, &show_ipv6_ospf6_interface_ifname_cmd);
+	install_element(VIEW_NODE,
+			&show_ipv6_ospf6_interface_ifname_prefix_cmd);
+	install_element(VIEW_NODE, &show_ipv6_ospf6_interface_traffic_cmd);
+
+	install_element(INTERFACE_NODE, &ipv6_ospf6_area_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_area_cmd);
+	install_element(INTERFACE_NODE, &ipv6_ospf6_cost_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_cost_cmd);
+	install_element(INTERFACE_NODE, &ipv6_ospf6_ifmtu_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_ifmtu_cmd);
+
+	install_element(INTERFACE_NODE, &ipv6_ospf6_deadinterval_cmd);
+	install_element(INTERFACE_NODE, &ipv6_ospf6_hellointerval_cmd);
+	install_element(INTERFACE_NODE, &ipv6_ospf6_gr_hdelay_cmd);
+	install_element(INTERFACE_NODE, &ipv6_ospf6_priority_cmd);
+	install_element(INTERFACE_NODE, &ipv6_ospf6_retransmitinterval_cmd);
+	install_element(INTERFACE_NODE, &ipv6_ospf6_transmitdelay_cmd);
+	install_element(INTERFACE_NODE, &ipv6_ospf6_instance_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_deadinterval_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_hellointerval_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_gr_hdelay_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_priority_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_retransmitinterval_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_transmitdelay_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_instance_cmd);
+
+	install_element(INTERFACE_NODE, &ipv6_ospf6_passive_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_passive_cmd);
+
+	install_element(INTERFACE_NODE, &ipv6_ospf6_mtu_ignore_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_mtu_ignore_cmd);
+
+	install_element(INTERFACE_NODE, &ipv6_ospf6_advertise_prefix_list_cmd);
+	install_element(INTERFACE_NODE,
+			&no_ipv6_ospf6_advertise_prefix_list_cmd);
+
+	install_element(INTERFACE_NODE, &ipv6_ospf6_network_cmd);
+	install_element(INTERFACE_NODE, &no_ipv6_ospf6_network_cmd);
+
+	/* reference bandwidth commands */
+	install_element(OSPF6_NODE, &auto_cost_reference_bandwidth_cmd);
+	install_element(OSPF6_NODE, &no_auto_cost_reference_bandwidth_cmd);
+	/* write-multiplier commands */
+	install_element(OSPF6_NODE, &ospf6_write_multiplier_cmd);
+	install_element(OSPF6_NODE, &no_ospf6_write_multiplier_cmd);
+}
+
+/* Clear the specified interface structure */
+void ospf6_interface_clear(struct interface *ifp)
+{
+	struct ospf6_interface *oi;
+
+	if (!if_is_operative(ifp))
+		return;
+
+	if (ifp->info == NULL)
+		return;
+
+	oi = (struct ospf6_interface *)ifp->info;
+
+	if (IS_OSPF6_DEBUG_INTERFACE)
+		zlog_debug("Interface %s: clear by reset", ifp->name);
+
+	/* Reset the interface */
+	event_execute(master, interface_down, oi, 0, NULL);
+	event_execute(master, interface_up, oi, 0, NULL);
+}
+
+/* Clear interface */
+DEFUN (clear_ipv6_ospf6_interface,
+       clear_ipv6_ospf6_interface_cmd,
+       "clear ipv6 ospf6 [vrf NAME] interface [IFNAME]",
+       CLEAR_STR
+       IP6_STR
+       OSPF6_STR
+       VRF_CMD_HELP_STR
+       INTERFACE_STR
+       IFNAME_STR
+       )
+{
+	struct vrf *vrf;
+	int idx_vrf = 3;
+	int idx_ifname = 4;
+	struct interface *ifp;
+	const char *vrf_name;
+
+	if (argv_find(argv, argc, "vrf", &idx_vrf))
+		vrf_name = argv[idx_vrf + 1]->arg;
+	else
+		vrf_name = VRF_DEFAULT_NAME;
+	vrf = vrf_lookup_by_name(vrf_name);
+	if (!vrf) {
+		vty_out(vty, "%% VRF %s not found\n", vrf_name);
+		return CMD_WARNING;
+	}
+
+	if (!argv_find(argv, argc, "IFNAME", &idx_ifname)) {
+		/* Clear all the ospfv3 interfaces. */
+		FOR_ALL_INTERFACES (vrf, ifp)
+			ospf6_interface_clear(ifp);
+	} else {
+		/* Interface name is specified. */
+		ifp = if_lookup_by_name_vrf(argv[idx_ifname]->arg, vrf);
+		if (!ifp) {
+			vty_out(vty, "No such Interface: %s\n",
+				argv[idx_ifname]->arg);
+			return CMD_WARNING;
+		}
+		ospf6_interface_clear(ifp);
+	}
+
+	return CMD_SUCCESS;
+}
+
+void install_element_ospf6_clear_interface(void)
+{
+	install_element(ENABLE_NODE, &clear_ipv6_ospf6_interface_cmd);
+}
+
+DEFUN (debug_ospf6_interface,
+       debug_ospf6_interface_cmd,
+       "debug ospf6 interface",
+       DEBUG_STR
+       OSPF6_STR
+       "Debug OSPFv3 Interface\n"
+      )
+{
+	OSPF6_DEBUG_INTERFACE_ON();
+	return CMD_SUCCESS;
+}
+
+DEFUN (no_debug_ospf6_interface,
+       no_debug_ospf6_interface_cmd,
+       "no debug ospf6 interface",
+       NO_STR
+       DEBUG_STR
+       OSPF6_STR
+       "Debug OSPFv3 Interface\n"
+      )
+{
+	OSPF6_DEBUG_INTERFACE_OFF();
+	return CMD_SUCCESS;
+}
+
+int config_write_ospf6_debug_interface(struct vty *vty)
+{
+	if (IS_OSPF6_DEBUG_INTERFACE)
+		vty_out(vty, "debug ospf6 interface\n");
+	return 0;
+}
+
+void install_element_ospf6_debug_interface(void)
+{
+	install_element(ENABLE_NODE, &debug_ospf6_interface_cmd);
+	install_element(ENABLE_NODE, &no_debug_ospf6_interface_cmd);
+	install_element(CONFIG_NODE, &debug_ospf6_interface_cmd);
+	install_element(CONFIG_NODE, &no_debug_ospf6_interface_cmd);
+}
+
+void ospf6_auth_write_config(struct vty *vty, struct ospf6_auth_data *at_data)
+{
+	if (CHECK_FLAG(at_data->flags, OSPF6_AUTH_TRAILER_KEYCHAIN))
+		vty_out(vty, " ipv6 ospf6 authentication keychain %s\n",
+			at_data->keychain);
+	else if (CHECK_FLAG(at_data->flags, OSPF6_AUTH_TRAILER_MANUAL_KEY))
+		vty_out(vty,
+			" ipv6 ospf6 authentication key-id %d hash-algo %s key %s\n",
+			at_data->key_id,
+			keychain_get_algo_name_by_id(at_data->hash_algo),
+			at_data->auth_key);
+}
+
+DEFUN(ipv6_ospf6_intf_auth_trailer_keychain,
+      ipv6_ospf6_intf_auth_trailer_keychain_cmd,
+      "ipv6 ospf6 authentication keychain KEYCHAIN_NAME",
+      IP6_STR OSPF6_STR
+      "Enable authentication on this interface\n"
+      "Keychain\n"
+      "Keychain name\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int keychain_idx = 4;
+	struct ospf6_interface *oi;
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+
+	assert(oi);
+	if (CHECK_FLAG(oi->at_data.flags, OSPF6_AUTH_TRAILER_MANUAL_KEY)) {
+		vty_out(vty,
+			"Manual key configured, unconfigure it before configuring key chain\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	SET_FLAG(oi->at_data.flags, OSPF6_AUTH_TRAILER_KEYCHAIN);
+	if (oi->at_data.keychain)
+		XFREE(MTYPE_OSPF6_AUTH_KEYCHAIN, oi->at_data.keychain);
+
+	oi->at_data.keychain =
+		XSTRDUP(MTYPE_OSPF6_AUTH_KEYCHAIN, argv[keychain_idx]->arg);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_ipv6_ospf6_intf_auth_trailer_keychain,
+      no_ipv6_ospf6_intf_auth_trailer_keychain_cmd,
+      "no ipv6 ospf6 authentication keychain [KEYCHAIN_NAME]",
+      NO_STR IP6_STR OSPF6_STR
+      "Enable authentication on this interface\n"
+      "Keychain\n"
+      "Keychain name\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+
+	assert(oi);
+	if (!CHECK_FLAG(oi->at_data.flags, OSPF6_AUTH_TRAILER_KEYCHAIN))
+		return CMD_SUCCESS;
+
+	if (oi->at_data.keychain) {
+		oi->at_data.flags = 0;
+		XFREE(MTYPE_OSPF6_AUTH_KEYCHAIN, oi->at_data.keychain);
+		oi->at_data.keychain = NULL;
+	}
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(ipv6_ospf6_intf_auth_trailer_key, ipv6_ospf6_intf_auth_trailer_key_cmd,
+      "ipv6 ospf6 authentication key-id (1-65535) hash-algo "
+      "<md5|hmac-sha-1|hmac-sha-256|hmac-sha-384|hmac-sha-512> "
+      "key WORD",
+      IP6_STR OSPF6_STR
+      "Authentication\n"
+      "Key ID\n"
+      "Key ID value\n"
+      "Cryptographic-algorithm\n"
+      "Use MD5 algorithm\n"
+      "Use HMAC-SHA-1 algorithm\n"
+      "Use HMAC-SHA-256 algorithm\n"
+      "Use HMAC-SHA-384 algorithm\n"
+      "Use HMAC-SHA-512 algorithm\n"
+      "Password\n"
+      "Password string (key)\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	int key_id_idx = 4;
+	int hash_algo_idx = 6;
+	int password_idx = 8;
+	struct ospf6_interface *oi;
+	uint8_t hash_algo = KEYCHAIN_ALGO_NULL;
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+
+	assert(oi);
+	if (CHECK_FLAG(oi->at_data.flags, OSPF6_AUTH_TRAILER_KEYCHAIN)) {
+		vty_out(vty,
+			"key chain configured, unconfigure it before configuring manual key\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+
+	hash_algo = keychain_get_algo_id_by_name(argv[hash_algo_idx]->arg);
+#ifndef CRYPTO_OPENSSL
+	if (hash_algo == KEYCHAIN_ALGO_NULL) {
+		vty_out(vty,
+			"Hash algorithm not supported, compile with --with-crypto=openssl\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+#endif /* CRYPTO_OPENSSL */
+
+	SET_FLAG(oi->at_data.flags, OSPF6_AUTH_TRAILER_MANUAL_KEY);
+	oi->at_data.hash_algo = hash_algo;
+	oi->at_data.key_id = (uint16_t)strtol(argv[key_id_idx]->arg, NULL, 10);
+	if (oi->at_data.auth_key)
+		XFREE(MTYPE_OSPF6_AUTH_MANUAL_KEY, oi->at_data.auth_key);
+	oi->at_data.auth_key =
+		XSTRDUP(MTYPE_OSPF6_AUTH_MANUAL_KEY, argv[password_idx]->arg);
+
+	return CMD_SUCCESS;
+}
+
+DEFUN(no_ipv6_ospf6_intf_auth_trailer_key,
+      no_ipv6_ospf6_intf_auth_trailer_key_cmd,
+      "no ipv6 ospf6 authentication key-id [(1-65535) hash-algo "
+      "<md5|hmac-sha-1|hmac-sha-256|hmac-sha-384|hmac-sha-512> "
+      "key WORD]",
+      NO_STR IP6_STR OSPF6_STR
+      "Authentication\n"
+      "Key ID\n"
+      "Key ID value\n"
+      "Cryptographic-algorithm\n"
+      "Use MD5 algorithm\n"
+      "Use HMAC-SHA-1 algorithm\n"
+      "Use HMAC-SHA-256 algorithm\n"
+      "Use HMAC-SHA-384 algorithm\n"
+      "Use HMAC-SHA-512 algorithm\n"
+      "Password\n"
+      "Password string (key)\n")
+{
+	VTY_DECLVAR_CONTEXT(interface, ifp);
+	struct ospf6_interface *oi;
+#ifndef CRYPTO_OPENSSL
+	int hash_algo_idx = 7;
+	uint8_t hash_algo = KEYCHAIN_ALGO_NULL;
+#endif /* CRYPTO_OPENSSL */
+
+	oi = (struct ospf6_interface *)ifp->info;
+	if (oi == NULL)
+		oi = ospf6_interface_create(ifp);
+
+	assert(oi);
+	if (!CHECK_FLAG(oi->at_data.flags, OSPF6_AUTH_TRAILER_MANUAL_KEY))
+		return CMD_SUCCESS;
+
+#ifndef CRYPTO_OPENSSL
+	hash_algo = keychain_get_algo_id_by_name(argv[hash_algo_idx]->arg);
+	if (hash_algo == KEYCHAIN_ALGO_NULL) {
+		vty_out(vty,
+			"Hash algorithm not supported, compile with --with-crypto=openssl\n");
+		return CMD_WARNING_CONFIG_FAILED;
+	}
+#endif /* CRYPTO_OPENSSL */
+
+	if (oi->at_data.auth_key) {
+		oi->at_data.flags = 0;
+		XFREE(MTYPE_OSPF6_AUTH_MANUAL_KEY, oi->at_data.auth_key);
+		oi->at_data.auth_key = NULL;
+	}
+
+	return CMD_SUCCESS;
+}
+
+void ospf6_interface_auth_trailer_cmd_init(void)
+{
+	/*Install OSPF6 auth trailer commands at interface level */
+	install_element(INTERFACE_NODE,
+			&ipv6_ospf6_intf_auth_trailer_keychain_cmd);
+	install_element(INTERFACE_NODE,
+			&no_ipv6_ospf6_intf_auth_trailer_keychain_cmd);
+	install_element(INTERFACE_NODE, &ipv6_ospf6_intf_auth_trailer_key_cmd);
+	install_element(INTERFACE_NODE,
+			&no_ipv6_ospf6_intf_auth_trailer_key_cmd);
+}