Cisco ASR 9000 Series Configuration Manual page 75

Aggregation services router

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Implementing BGP

BGP Route Reflectors

route to other iBGP speakers because the routers do not pass on routes learned from internal neighbors to

other internal neighbors, thus preventing a routing information loop.

Figure 6: Three Fully Meshed iBGP Speakers

With route reflectors, all iBGP speakers need not be fully meshed because there is a method to pass learned

routes to neighbors. In this model, an iBGP peer is configured to be a route reflector responsible for passing

iBGP learned routes to a set of iBGP neighbors. In

Figure 7: Simple BGP Model with a Route Reflector, on

, Router B is configured as a route reflector. When the route reflector receives routes advertised from

Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x