Network Design with Route Reflectors Cont

© 2004 Cisco Systems, Ii

© 2004 Cisco Systems, Ii

In this example, the routers that serve as route reflectors and the non-route-reflector router have IBGP sessions in a full mesh.

In the area called the "redundant cluster," the four client routers and the two route reflector routers make up the cluster. Each of the four client routers has an IBGP session with the two route reflectors and only with those two route reflectors.

In the nonredundant area, each of the two client routers has a single physical connection to a route reflector router. These three routers form a nonredundant cluster. The router designated as the route reflector in the cluster is already a single point of failure in this physical design because a failure of this router will prevent the clients in the cluster from reaching the rest of the network. Therefore, there is no new single point of failure that is introduced when the router is configured as the only route reflector in this cluster. Each of the two clients has a single IBGP session to the route reflector.

The other router shown is not configured as a route reflector nor is it a client to any other route reflector. It serves as an example of where a non-route-reflector router participates in the full mesh.

Copyright © 2004, Cisco Systems, Inc. Scaling Service Provider Networks

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This topic lists the potential issues that can arise if the route reflector network design rules as explained in the previous topic are not followed.

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