Cisco Systems 78-11741-02 manual IPC-318, Simple BGP Model with a Route Reflector

Configuring BGP

Configuring Advanced BGP Features

Figure 56 Simple BGP Model with a Route Reflector

		Partially meshed autonomous system
	Routes
		Router A	Router C
Router A
External
BGP		Routes
speaker			Reflected
			routes

Router B

Route reflector

S4219

The internal peers of the route reflector are divided into two groups: client peers and all the other routers in the autonomous system (nonclient peers). A route reflector reflects routes between these two groups. The route reflector and its client peers form a cluster. The nonclient peers must be fully meshed with each other, but the client peers need not be fully meshed. The clients in the cluster do not communicate with iBGP speakers outside their cluster.

Figure 57 More Complex BGP Route Reflector Model

			Partially meshed
			autonomous system
				Nonclient
	Route reflector		Router G
				Nonclient
	Routes
			Router F
Router A	advertised Router A
External
BGP
speaker				Nonclient
		Cluster	Router E

S4218

Router B	Router C	Router D
Client	Client	Client

Cisco IOS IP Configuration Guide

IPC-318