Configuring BGP Multihoming for VPWS
You can configure BGP multihoming in the VPWS 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 VPWS
service and traffic forwarding to and from the multihomed site while avoiding the
formation of layer 2 traffic loops.
To configure BGP multihoming on a VPWS PE router:
1. Configure the site as multihomed and specify a multihoming priority for the PE
site for this instance.
host1(config)#l2vpn exampleco site-name westford site-id 1 multi-homed priority
2
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 VPWS network.
You can configure a different block offset, label range, and route distinguisher for
each connected PE router.
Related Topics VPWS Configuration Tasks on page 658â–
â– l2vpn site-name site-id
Configuring Customer-Facing Interfaces in the VPWS Instance
You must configure one of the following types of interfaces as a member of the VPWS
to transmit packets between the PE router and each CE device to which the PE router
is connected:
â– ATM (AAL5 VCC transport or ATM VCC cell transport)
â– Cisco HDLC
â– Ethernet (Fast Ethernet, Gigabit Ethernet, or 10-Gigabit Ethernet)
â– Frame Relay
â– PPP
â– VLAN and S-VLAN subinterfaces over Fast Ethernet, Gigabit Ethernet, or 10-Gigabit
Ethernet interfaces
To configure a customer-facing interface for an VPWS instance:
Configuring BGP Multihoming for VPWS â– 661
Chapter 13: Configuring VPWS
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