diff --git a/ospfd/ospf_asbr.c b/ospfd/ospf_asbr.c
index b47c390088..738ac6d8cf 100644
--- a/ospfd/ospf_asbr.c
+++ b/ospfd/ospf_asbr.c
@@ -168,6 +168,38 @@ void ospf_external_info_delete(struct ospf *ospf, uint8_t type,
 	}
 }
 
+/*
+ * ospf_external_info_delete_multi_instance
+ *
+ * Delete instances of the external route information for a given route type.
+ * The preserve_instance parameter may be used to prevent the current instance
+ * from being deleted.
+ */
+void ospf_external_info_delete_multi_instance(struct ospf *ospf, uint8_t type, struct prefix_ipv4 p,
+					      unsigned long preserve_instance)
+{
+	struct route_node *rn;
+	struct ospf_external *ext;
+	struct list *ext_list;
+	struct listnode *node;
+
+	ext_list = ospf->external[type];
+	if (!ext_list)
+		return;
+
+	for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext)) {
+		if (ext->instance != preserve_instance) {
+			rn = route_node_lookup(EXTERNAL_INFO(ext), (struct prefix *)&p);
+			if (rn) {
+				ospf_external_info_free(rn->info);
+				rn->info = NULL;
+				route_unlock_node(rn);
+				route_unlock_node(rn);
+			}
+		}
+	}
+}
+
 struct external_info *ospf_external_info_lookup(struct ospf *ospf, uint8_t type,
 						unsigned short instance,
 						struct prefix_ipv4 *p)
@@ -189,6 +221,44 @@ struct external_info *ospf_external_info_lookup(struct ospf *ospf, uint8_t type,
 	return NULL;
 }
 
+/*
+ * ospf_external_info_default_lookup
+ *
+ * For default information criteria, we really don't care about the
+ * source of the route and there only should be one.
+ */
+struct external_info *ospf_external_info_default_lookup(struct ospf *ospf)
+{
+	struct ospf_external *ext;
+	struct external_info *ei;
+	struct list *ext_list;
+	struct listnode *node;
+	struct route_node *rn;
+	struct prefix_ipv4 p = {
+		.family = AF_INET,
+		.prefixlen = 0,
+		.prefix.s_addr = INADDR_ANY,
+	};
+
+	ext_list = ospf->external[DEFAULT_ROUTE];
+	if (!ext_list)
+		return (NULL);
+
+	for (ALL_LIST_ELEMENTS_RO(ext_list, node, ext)) {
+		rn = route_node_lookup(EXTERNAL_INFO(ext), (struct prefix *)&p);
+		if (rn) {
+			route_unlock_node(rn);
+			if (rn->info) {
+				ei = rn->info;
+				if (ei->type != ZEBRA_ROUTE_OSPF || ei->instance != ospf->instance)
+					return ei;
+			}
+		}
+	}
+
+	return NULL;
+}
+
 struct ospf_lsa *ospf_external_info_find_lsa(struct ospf *ospf,
 					     struct prefix_ipv4 *p)
 {
diff --git a/ospfd/ospf_asbr.h b/ospfd/ospf_asbr.h
index 6158d65f22..648a5a11ae 100644
--- a/ospfd/ospf_asbr.h
+++ b/ospfd/ospf_asbr.h
@@ -109,6 +109,10 @@ ospf_external_info_add(struct ospf *, uint8_t, unsigned short,
 		       route_tag_t, uint32_t metric);
 extern void ospf_external_info_delete(struct ospf *, uint8_t, unsigned short,
 				      struct prefix_ipv4);
+extern void ospf_external_info_delete_multi_instance(struct ospf *ospf, uint8_t type,
+						     struct prefix_ipv4 p,
+						     unsigned long preserve_instance);
+#define OSPF_DELETE_ANY_INSTANCE 0xffffffff
 extern struct external_info *ospf_external_info_lookup(struct ospf *, uint8_t,
 						       unsigned short,
 						       struct prefix_ipv4 *);
diff --git a/ospfd/ospf_lsa.c b/ospfd/ospf_lsa.c
index 1350487898..7354223397 100644
--- a/ospfd/ospf_lsa.c
+++ b/ospfd/ospf_lsa.c
@@ -2407,15 +2407,10 @@ struct ospf_lsa *ospf_nssa_lsa_refresh(struct ospf_area *area,
 static struct external_info *ospf_default_external_info(struct ospf *ospf)
 {
 	int type;
-	struct prefix_ipv4 p;
 	struct external_info *default_ei;
 	int ret = 0;
 
-	p.family = AF_INET;
-	p.prefix.s_addr = 0;
-	p.prefixlen = 0;
-
-	default_ei = ospf_external_info_lookup(ospf, DEFAULT_ROUTE, 0, &p);
+	default_ei = ospf_external_info_default_lookup(ospf);
 	if (!default_ei)
 		return NULL;
 
diff --git a/ospfd/ospf_vty.c b/ospfd/ospf_vty.c
index 0457b13337..27528f6594 100644
--- a/ospfd/ospf_vty.c
+++ b/ospfd/ospf_vty.c
@@ -7347,6 +7347,9 @@ DEFPY (show_ip_ospf_database,
 	struct in_addr *adv_router_p = NULL;
 	json_object *json = NULL;
 
+	if (instance_id != ospf_instance)
+		return CMD_NOT_MY_INSTANCE;
+
 	if (uj)
 		json = json_object_new_object();
 	if (lsid_str)
diff --git a/ospfd/ospf_zebra.c b/ospfd/ospf_zebra.c
index c7cba1e20f..b718d498ae 100644
--- a/ospfd/ospf_zebra.c
+++ b/ospfd/ospf_zebra.c
@@ -1292,15 +1292,14 @@ static int ospf_zebra_read_route(ZAPI_CALLBACK_ARGS)
 	 * originate)ZEBRA_ROUTE_MAX is used to delete the ex-info.
 	 * Resolved this inconsistency by maintaining same route type.
 	 */
-	if ((is_default_prefix(&pgen)) && (api.type != ZEBRA_ROUTE_OSPF))
+	if ((is_default_prefix(&pgen)) &&
+	    ((api.type != ZEBRA_ROUTE_OSPF) || (api.instance != ospf->instance)))
 		rt_type = DEFAULT_ROUTE;
 
 	if (IS_DEBUG_OSPF(zebra, ZEBRA_REDISTRIBUTE))
-		zlog_debug("%s: cmd %s from client %s: vrf %s(%u), p %pFX, metric %d",
-			   __func__, zserv_command_string(cmd),
-			   zebra_route_string(api.type),
-			   ospf_vrf_id_to_name(vrf_id), vrf_id, &api.prefix,
-			   api.metric);
+		zlog_debug("%s: cmd %s from client %s-%d: vrf %s(%u), p %pFX, metric %d", __func__,
+			   zserv_command_string(cmd), zebra_route_string(api.type), api.instance,
+			   ospf_vrf_id_to_name(vrf_id), vrf_id, &api.prefix, api.metric);
 
 	if (cmd == ZEBRA_REDISTRIBUTE_ROUTE_ADD) {
 		/* XXX|HACK|TODO|FIXME:
@@ -1315,16 +1314,17 @@ static int ospf_zebra_read_route(ZAPI_CALLBACK_ARGS)
 			api.tag = ospf->dtag[rt_type];
 
 		/*
-		 * Given zebra sends update for a prefix via ADD message, it
-		 * should
-		 * be considered as an implicit DEL for that prefix with other
-		 * source
-		 * types.
+		 * Given zebra sends an update for a prefix via an ADD message, it
+		 * will be considered as an impilict DELETE for that prefix for other
+		 * types and instances other than the type and instance associated with
+		 * the prefix.
 		 */
-		for (i = 0; i <= ZEBRA_ROUTE_MAX; i++)
-			if (i != rt_type)
-				ospf_external_info_delete(ospf, i, api.instance,
-							  p);
+		for (i = 0; i <= ZEBRA_ROUTE_MAX; i++) {
+			unsigned long preserve_instance;
+
+			preserve_instance = (i == rt_type) ? api.instance : OSPF_DELETE_ANY_INSTANCE;
+			ospf_external_info_delete_multi_instance(ospf, i, p, preserve_instance);
+		}
 
 		ei = ospf_external_info_add(ospf, rt_type, api.instance, p,
 					    ifindex, nexthop, api.tag,
diff --git a/ospfd/ospf_zebra.h b/ospfd/ospf_zebra.h
index 86a5678fc4..b83524303f 100644
--- a/ospfd/ospf_zebra.h
+++ b/ospfd/ospf_zebra.h
@@ -47,6 +47,9 @@ extern uint8_t ospf_distance_apply(struct ospf *ospf, struct prefix_ipv4 *,
 				   struct ospf_route *);
 extern struct ospf_external *ospf_external_lookup(struct ospf *, uint8_t,
 						  unsigned short);
+
+extern struct external_info *ospf_external_info_default_lookup(struct ospf *ospf);
+
 extern struct ospf_external *ospf_external_add(struct ospf *, uint8_t,
 					       unsigned short);