Index: sys/net/bridgestp.c
===================================================================
--- sys/net/bridgestp.c
+++ sys/net/bridgestp.c
@@ -2232,6 +2232,7 @@
 
 	switch (ifp->if_type) {
 		case IFT_ETHER:	/* These can do spanning tree. */
+		case IFT_L2VLAN:
 			break;
 		default:
 			/* Nothing else can. */