EIGRP over MPLS: Layer 3 VPN

Figure 2-6 shows the network topology for the configuration that follows, which shows how to configure EIGRP over MPLS where the MPLS PE devices are taking part in the EIGRP process.

NOTE: In this example, it is assumed that the MPLS network is configured with the MPLS PE devices participating in the EIGRP process and virtual route forwarding. Only the client-side EIGRP configuration is observed here.

NOTE: When deploying EIGRP over Metro Ethernet, no changes are needed to the basic EIGRP configuration from the customer perspective. The only difference here is that the customer has to agree upon the EIGRP parameters autonomous system numbers, authentication password, and so on with the service provider, as these parameters are often governed by the service provider.

NOTE: The PE routers receive IPv4 routing updates from the CE routers and install them in the appropriate Virtual Routing and Forwarding (VRF) table. This part of the configuration and operation is the responsibility of the service provider.

NOTE: From the EIGRP perspective, the MPLS backbone and routers PE1 and PE2 are not visible. A neighbor relationship is established directly between routers R1 and R2; this is verified with the show ip eigrp neighbors command output.