Figure 27: Community Lists
Suppose you want router Albany to set metrics for routes that it forwards to router
Boston based on the communities to which the routes belong. You can create
community lists and filter the routes with a route map that matches on the community
list. The following commands demonstrate how to configure router Albany:
host1(config)#router bgp 293
host1(config-router)#neighbor 10.5.5.2 remote-as 32
host1(config-router)#neighbor 10.2.2.1 remote-as 451
host1(config-router)#neighbor 10.2.2.4 remote-as 17
host1(config-router)#neighbor 10.2.2.4 route-map commtrc out
host1(config-router)#exit
host1(config)#route-map commtrc permit 1
host1(config-route-map)#match community 1
host1(config-route-map)#set metric 20
host1(config-route-map)#exit
host1(config)#route-map commtrc permit 2
host1(config-route-map)#match community 2
host1(config-route-map)#set metric 75
host1(config-route-map)#exit
host1(config)#route-map commtrc permit 3
host1(config-route-map)#match community 3
host1(config-route-map)#set metric 85
host1(config-route-map)#exit
host1(config)#ip community-list 1 permit 25
host1(config)#ip community-list 2 permit 62
host1(config)#ip community-list 3 permit internet
Community list 1 comprises routes with a community of 25; their metric is set to
20. Community list 2 comprises routes with a community of 62; their metric is set
to 75. Community 3 catches all remaining routes by matching the internet community;
their metric is set to 85.
ip community-list
96 â– Configuring BGP Routing Policy
JUNOSe 11.1.x BGP and MPLS Configuration Guide
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