host1(config)#route-map nyc1 permit 10
host1(config-route-map)#set as-path prepend list list10
■ Use the no version to delete the set clause from a route map.
■ See set as-path prepend.
set comm-list delete
■ Use to remove communities specified by the community list from the community
attribute of routes matching the route map.
■ You can use this command to delete communities only if the community list
was created with a single community per list entry as shown in the following
sample configuration for router Test:
host1(config)#ip community-list 1 permit 231:10
host1(config)#ip community-list 1 permit 231:20
host1(config)#router bgp 45
host1(config-router)#neighbor 10.6.2.5 remote-as 5
host1(config-router)#neighbor 10.6.2.5 route-map indelete in
host1(config-router)#route-map indelete permit 10
host1(config-route-map)#set comm-list 1 delete
Router Test receives the same route from 10.6.2.5 and applies the indelete route
map. BGP compares each list entry with the community attribute. A match is
found for the list entry 231:10, and this community is deleted from the
community attribute. Similarly, a match is found for the list entry of 231:20, and
this community is deleted from the community attribute.
■ Use the no version to delete the set clause from a route map.
■ See set comm-list delete.
set community
■ Use to set the community attribute in BGP updates.
■ You can specify a community list number in the range 1–4294967295, or in the
new community format of AA:NN, or one of the following well-known
communities:
■ local-as—Prevents advertisement outside the local AS
■ no-advertise—Prevents advertisement to any peer
■ no-export—Prevents advertisement beyond the BGP confederation boundary
■ Alternatively, you can use the list keyword to specify the name of a community
list that you previously created with the ip community-list command.
■ Example
host1(config)#route-map nyc1 permit 10
host1(config-route-map)#set community no-advertise
■ Use the none keyword to remove the community attribute from a route.
Configuring BGP Routing Policy ■ 77
Chapter 1: Configuring BGP Routing
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