L2VPN: BGP signaling

Layer 2 VPNs also known as Kompella Layer 2 VPNs are BGP signaled and defined in RFC4761. They use BGP AFI 25 and SAFI 65 and are a way to transport a Layer 2 payload across an MPLS network. A Layer 2 VPN provides complete separation between the provider and customer networks. The benefits of a Layer 2 VPN include support for nonstandard transport protocols and the isolation of link addressing and routing protocol operation between the customer and provider networks.