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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.

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.

JunosE 11.2.x BGP and MPLS Configuration Guide

Juniper JUNOSE 11.2.X BGP AND MPLS User Manual

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