User:Ethernet 1968

Route reflectors

BGP requires that all BGP peers in the same autonomous system form an iBGP session with all peers in the autonomous system. This is too difficult in many environments. Route reflectors are fully functional iBGP speakers that form iBGP sessions with other iBGP speakers, and they also perform a second function - they forward routes from other iBGP speakers to route reflector clients. The route reflector clients and clients form a cluster.

To configure route reflectors, consider these initial tasks:

•Configure the proper cluster ID value on the route reflector •Configure the route reflector with information about which iBGP neighbor sessions are reaching their clients •In the clients, remove all iBGP sessions to neighbors that are not a route reflector in the client cluster •Make sure that the iBGP neighbor is removed on both ends of the iBGP session The command used to configure the cluster ID if the BGP cluster has redundant route reflectors is as follows:

bgp cluster-id cluster-id

The command used to configure the router as a BGP route reflector and configure the specified neighbor as its client is as follows:

neighbor ip-address route-reflector-client