D22243.diff
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	Index: head/sys/net/if_vlan.c
	===================================================================
	--- head/sys/net/if_vlan.c
	+++ head/sys/net/if_vlan.c
	@@ -1459,11 +1459,19 @@
	* Set up our interface address to reflect the underlying
	* physical interface's.
	*/
	- bcopy(IF_LLADDR(p), IF_LLADDR(ifp), p->if_addrlen);
	+ TASK_INIT(&ifv->lladdr_task, 0, vlan_lladdr_fn, ifv);
	((struct sockaddr_dl *)ifp->if_addr->ifa_addr)->sdl_alen =
	p->if_addrlen;

	- TASK_INIT(&ifv->lladdr_task, 0, vlan_lladdr_fn, ifv);
	+ /*
	+ * Do not schedule link address update if it was the same
	+ * as previous parent's. This helps avoid updating for each
	+ * associated llentry.
	+ */
	+ if (memcmp(IF_LLADDR(p), IF_LLADDR(ifp), p->if_addrlen) != 0) {
	+ bcopy(IF_LLADDR(p), IF_LLADDR(ifp), p->if_addrlen);
	+ taskqueue_enqueue(taskqueue_thread, &ifv->lladdr_task);
	+ }

	/* We are ready for operation now. */
	ifp->if_drv_flags \|= IFF_DRV_RUNNING;