Configuring BGP Multihoming for VPLS

You can configure BGP multihoming in the VPLS network to provide redundancy in the event of failures such as a PE router-to-CE device link failure, the failure of a PE router, or an MPLS reachability failure between the local PE router and a remote PE router. BGP multihoming enables you to connect a customer site to two or more PE routers. A redundant PE router can begin providing service to the customer site as soon as the failure is detected. The redundant connectivity maintains the VPLS service and traffic forwarding to and from the multihomed site while avoiding the formation of layer 2 traffic loops.

• Configure the site as multihomed and specify a multihoming priority for the PE site for this instance.
  host1(config)#bridge customer1 vpls site-name westford site-id 1 multi-homed priority 1

You must configure the same site ID on all PE routers connected to the multihomed customer site. The site ID shared by the connected PE routers should be different than the site IDs configured on the remote PE routers in the VPLS network.

You can configure a different block offset, label range, and route distinguisher for each connected PE router.