866 CHAPTER 56: BGP CONFIGURATION# Apply the routing policy.[RouterA] bgp 10[RouterA-bgp] peer 200.1.2.2 route-policy comm_policy export[RouterA-bgp] peer 200.1.2.2 advertise-community# Display BGP routing table information on Router B.[RouterB] display bgp routing-table 9.1.1.0BGP local router ID : 2.2.2.2Local AS number : 20Paths: 1 available, 1 bestBGP routing table entry information of 9.1.1.0/24:From : 200.1.2.1 (1.1.1.1)Original nexthop: 200.1.2.1Community : No-ExportAS-path : 10Origin : igpAttribute value : MED 0, pref-val 0, pre 255State : valid, external, best,Not advertised to any peers yetYou can find the configured community attribute in the above output. At thistime, the route to the destination 9.1.1.0/24 is not available in the routing table ofRouter C.BGP Route ReflectorConfigurationNetwork requirementsIn the following figure, all routers run BGP.■ Between Router A and Router B is an EBGP connection, between Router C andRouter B, Router C and Router D are IBGP connections.■ Router C is a route reflector with clients Router B and D.■ Router D can learn route 1.0.0.0/8 from Router C.Network diagramFigure 250 Network diagram for BGP route reflector configurationConfiguration procedure1 Configure IP addresses for interfaces (omitted)2 Configure BGP connections (omitted)S2/0192.1.1.1 /24Router AAS 100S2/0192 .1 .1.2/24Eth1/01.1.1.1/8S2 /1193 .1 .1.2/24S2/0194 .1.1.2/24S 2/0194 .1.1 .1/24S2/1193 .1 .1.1/24Router CRouter B Router DAS 200RouteReflector
