Index: sys/net/if.h
===================================================================
--- sys/net/if.h
+++ sys/net/if.h
@@ -181,6 +181,7 @@
 #define	LINK_STATE_UNKNOWN	0	/* link invalid/unknown */
 #define	LINK_STATE_DOWN		1	/* link is down */
 #define	LINK_STATE_UP		2	/* link is up */
+#define	LINK_STATE_UP_FORCE	3	/* link is up force event */
 
 /*
  * Some convenience macros used for setting ifi_baudrate.
Index: sys/net/if.c
===================================================================
--- sys/net/if.c
+++ sys/net/if.c
@@ -2028,6 +2028,9 @@
 	if (ifp->if_link_state == link_state)
 		return;
 
+	if (link_state == LINK_STATE_UP_FORCE)
+		link_state = LINK_STATE_UP;
+
 	ifp->if_link_state = link_state;
 
 	taskqueue_enqueue(taskqueue_swi, &ifp->if_linktask);
Index: sys/net/if_lagg.c
===================================================================
--- sys/net/if_lagg.c
+++ sys/net/if_lagg.c
@@ -1775,7 +1775,12 @@
 	/* Our link is considered up if at least one of our ports is active */
 	SLIST_FOREACH(lp, &sc->sc_ports, lp_entries) {
 		if (lp->lp_ifp->if_link_state == LINK_STATE_UP) {
-			new_link = LINK_STATE_UP;
+			/*
+			 * Force up to ensure ifnet_link_event is generated
+			 * allowing IP protocols to notify other nodes of
+			 * potential address move.
+			 */
+			new_link = LINK_STATE_UP_FORCE;
 			break;
 		}
 	}
@@ -1818,7 +1823,7 @@
 	LAGG_WUNLOCK(sc);
 }
 
-struct lagg_port *
+static __noinline struct lagg_port *
 lagg_link_active(struct lagg_softc *sc, struct lagg_port *lp)
 {
 	struct lagg_port *lp_next, *rval = NULL;
Index: sys/netinet/if_ether.c
===================================================================
--- sys/netinet/if_ether.c
+++ sys/netinet/if_ether.c
@@ -143,6 +143,7 @@
     struct ifnet *ifp, int bridged, struct llentry *la);
 static void arp_mark_lle_reachable(struct llentry *la);
 
+static eventhandler_tag ifnet_link_event_eh;
 
 static const struct netisr_handler arp_nh = {
 	.nh_name = "arp",
@@ -1151,9 +1152,41 @@
 }
 
 static void
+arp_notify(struct ifnet *ifp)
+{
+        struct ifaddr *ifa;
+
+        if (!(ifp->if_flags & IFF_UP) || (ifp->if_flags & IFF_NOARP))
+		return;
+
+        /*
+         * Send gratuitous ARPs to notify other nodes about potential address
+         * move.
+         */
+        TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+                if (ifa->ifa_addr->sa_family == AF_INET) {
+                        arp_ifinit(ifp, ifa);
+                }
+        }
+}
+
+static void
+arp_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate)
+{
+
+        if (linkstate == LINK_STATE_UP)
+		arp_notify(ifp);
+}
+
+static void
 arp_init(void)
 {
 
 	netisr_register(&arp_nh);
+
+	if (IS_DEFAULT_VNET(curvnet)) {
+		ifnet_link_event_eh = EVENTHANDLER_REGISTER(ifnet_link_event,
+		    arp_ifnet_link_event, 0, EVENTHANDLER_PRI_ANY);
+	}
 }
 SYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0);
Index: sys/netinet6/in6.c
===================================================================
--- sys/netinet6/in6.c
+++ sys/netinet6/in6.c
@@ -113,7 +113,7 @@
 #define V_icmp6_nodeinfo_oldmcprefix	VNET(icmp6_nodeinfo_oldmcprefix)
 
 /*
- * Definitions of some costant IP6 addresses.
+ * Definitions of some constant IP6 addresses.
  */
 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
Index: sys/netinet6/nd6.c
===================================================================
--- sys/netinet6/nd6.c
+++ sys/netinet6/nd6.c
@@ -112,6 +112,7 @@
 #endif
 
 static eventhandler_tag lle_event_eh;
+static eventhandler_tag ifnet_link_event_eh;
 
 /* for debugging? */
 #if 0
@@ -196,6 +197,29 @@
 	    type == RTM_ADD ? RTF_UP: 0), 0, RT_DEFAULT_FIB);
 }
 
+static void
+nd6_ifnet_link_event(void *arg __unused, struct ifnet *ifp, int linkstate)
+{
+	struct ifaddr *ifa;
+	struct in6_addr in6_all;
+
+	if (linkstate != LINK_STATE_UP)
+		return;
+
+	/*
+	 * Send neighbor advertisements to notify other nodes about potential
+	 * address move.
+	 */
+	in6_all = in6addr_linklocal_allnodes;
+
+	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
+		if (ifa->ifa_addr->sa_family == AF_INET6) {
+			nd6_na_output(ifp, &in6_all, IFA_IN6(ifa),
+			    ND_NA_FLAG_OVERRIDE, 1, NULL);
+		}
+	}
+}
+
 void
 nd6_init(void)
 {
@@ -211,9 +235,12 @@
 	    nd6_slowtimo, curvnet);
 
 	nd6_dad_init();
-	if (IS_DEFAULT_VNET(curvnet))
+	if (IS_DEFAULT_VNET(curvnet)) {
 		lle_event_eh = EVENTHANDLER_REGISTER(lle_event, nd6_lle_event,
 		    NULL, EVENTHANDLER_PRI_ANY);
+		ifnet_link_event_eh = EVENTHANDLER_REGISTER(ifnet_link_event,
+		    nd6_ifnet_link_event, NULL, EVENTHANDLER_PRI_ANY);
+	}
 }
 
 #ifdef VIMAGE
@@ -223,8 +250,10 @@
 
 	callout_drain(&V_nd6_slowtimo_ch);
 	callout_drain(&V_nd6_timer_ch);
-	if (IS_DEFAULT_VNET(curvnet))
+	if (IS_DEFAULT_VNET(curvnet)) {
 		EVENTHANDLER_DEREGISTER(lle_event, lle_event_eh);
+		EVENTHANDLER_DEREGISTER(ifnet_link_event, ifnet_link_event_eh);
+	}
 }
 #endif