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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 PE router for VPLS (or VPWS) L2VPNs to exchange layer 2 network layer reachability information (NLRI) for all VPLS (or VPWS) instances. Optionally, you can use the signaling keyword with the address-family command for the L2VPN address family to specify BGP signaling of VPLS reachability information. Currently, you can omit the signaling keyword with no adverse effects.
VPLS—The VPLS address family enables you to configure the PE 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 PE routers participating in a particular VPLS domain.

BGP Signaling for VPLS

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