Topology Overview

The sample topology in Figure 133 includes two L2VPNs, L2VPN A and L2VPN B. L2VPN A connects CE 1, at the edge of Customer A’s Boston site, with CE 3, at the edge of Customer A’s Chicago site. Similarly, L2VPN B connects CE 2, at the edge Customer B’s Boston site, with CE 4, at the edge of Customer B’s Chicago site.

The E-series routers in the topology, PE 1 and PE 2, each participate in both L2VPN A and L2VPN B. The example configures a total of four separate L2VPN instances, one for each L2VPN on each PE router. The instances for L2VPN A are named l2vpnA, and the instances for L2VPN B are named l2vpnB.

For each VPWS instance, an Ethernet network interface provides a connection to the associated CE device.

Each PE router in the sample topology also has an ATM core-facing interface that connects it to the provider (P) router in the service provider core. You must configure MPLS LSPs on the core-facing interfaces to connect PE 1 and PE 2 through the P router across the service provider core. Finally, you must configure BGP on both PE 1 and PE 2 to provide signaling for both L2VPNs.

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