This example illustrates how to configure an OSPF domain ID for a VPN by using OSPF as the routing protocol between the PE and CE routers. Routes from an OSPF domain need an OSPF domain ID when they are distributed in BGP as VPN-IPv4 routes in VPNs with multiple OSPF domains. In a VPN connecting multiple OSPF domains, the routes from one domain might overlap with the routes of another.
For more information on OSPF domain IDs and Layer 3 VPNs, see Configuring an OSPF Domain ID.
Figure 28 shows this example’s configuration topology. Only the configuration for Router PE1 is provided. The configuration for Router PE2 can be similar to the configuration for Router PE1. There are no special configuration requirements for the CE routers.
Figure 28: Example of a Configuration Using an OSPF Domain ID
For configuration information, see the following sections:
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