BGP Signaling for VPLS
BGP multiprotocol extensions (MP-BGP) enable BGP to support IPv4 services such as BGP/MPLS VPNs, which are sometimes known as RFC 2547bis VPNs. VPLS with BGP signaling is actually a BGP-MPLS application that has much in common with BGP/MPLS VPNs.
The procedures for configuring BGP signaling for BGP/MPLS VPNs and for VPLS are similar except, for VPLS, you must configure both of the following BGP address families:
- L2VPN—The L2VPN address family enables you to configure the VE router to exchange layer 2 network layer reachability information (NLRI) for all VPLS instances. Optionally, you can use the signaling keyword for the L2VPN address family to specify BGP signaling of L2VPN reachability information. Currently, you can omit the signaling keyword with no adverse effects.
- VPLS—The VPLS address family enables you to configure the VE router to exchange layer 2 NLRI for a specified VPLS instance.
BGP can exchange information in a VPLS topology within these address families. Specifically, BGP builds a full mesh of label-switched paths (LSPs) among all of the VPLS instances on each of the VPLS edge routers participating in a particular VPLS domain.