Juniper JUNOSE 11.2.X BGP AND MPLS Configuration Manual page 112

JunosE 11.2.x BGP and MPLS Configuration Guide
set comm-list delete
set community
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Use to modify an AS path for BGP routes by prepending one or more AS numbers or a
list of AS numbers to the path list.
The only global BGP metric available to influence the best-path selection is the AS-path
length. By varying the length of the AS path, a BGP speaker can influence the best-path
selection by a peer farther away.
Example
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.
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.
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.
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