VPLS has heavy overhead? in terms of control plane? it is a natural extension of p2p draft-martini if LDP is used for signaling, or natural extension of 2547bis if BGP is used for signaling. in terms of transport? all L2VPN (Ethernet/ATM/FR etc) over MPLS (or L2TP) have the same overhead. Only market decides the techonology is stupid or not. Most major equipment vendors support VPLS, obviously there is strong demand for this technology. VPLS does have its problems (scaling/standard resource dis