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Route Map Configuration Example

Consider the network structure shown in Figure 1. Suppose you do not want router Boston to receive any routes that originate in or pass through router Chicago.

Figure 1: Applying Route Maps to Routes

Image g013108.gif

You can use a route map to filter routes based on the autonomous system (AS) path to accomplish this goal. Use the following commands to configure router NY:



host1(config)#router bgp 293 

host1(config-router)#network 192.168.5.0 mask
255.255.255.0 

host1(config-router)#neighbor 10.5.5.2 remote-as
32 

host1(config-router)#neighbor 10.2.2.2 remote-as
873 

host1(config-router)#neighbor 10.2.2.4 remote-as
17 

host1(config-router)#neighbor 10.2.2.4 route-map
block1 out 

host1(config-router)#exit 

host1(config)#ip as-path access-list boston
deny _32_ 

host1(config)#route-map block1 deny 1 

host1(config-route-map)#match as-path boston

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