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To view the BGP configuration, use the show config command in CONFIGURATION ROUTER BGP
mode.
If you want to remove or add a specific COMMUNITY number from a BGP path, you must create a route
map with one or both of the following statements in the route map. Then apply that route map to a BGP
neighbor or peer group.
1. Enter ROUTE-MAP mode and assign a name to a route map.
CONFIGURATION mode
route-map map-name [permit | deny] [sequence-number]
2. Configure a set filter to delete all COMMUNITY numbers in the IP community list.
CONFIG-ROUTE-MAP mode
set comm-list community-list-name delete
OR
set community {community-number | local-as | no-advertise | no-export |
none}
Configure a community list by denying or permitting specific community numbers or types of
community.
• community-number: use AA:NN format where AA is the AS number (2 or 4 Bytes) and NN is a
value specific to that autonomous system.
• local-AS: routes with the COMMUNITY attribute of NO_EXPORT_SUBCONFED and are not sent
to EBGP peers.
• no-advertise: routes with the COMMUNITY attribute of NO_ADVERTISE and are not
advertised.
• no-export: routes with the COMMUNITY attribute of NO_EXPORT.
• none: remove the COMMUNITY attribute.
• additive: add the communities to already existing communities.
3. Return to CONFIGURATION mode.
CONFIG-ROUTE-MAP mode
exit
4. Enter the ROUTER BGP mode.
CONFIGURATION mode
router bgp as-number
5. Apply the route map to the neighbor or peer group’s incoming or outgoing routes.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | peer-group-name} route-map map-name {in | out}
Example of the show ip bgp community Command
To view the BGP configuration, use the show config command in CONFIGURATION ROUTER BGP
mode. To view a route map configuration, use the show route-map command in EXEC Privilege mode.
To view BGP routes matching a certain community number or a pre-defined BGP community, use the
show ip bgp community command in EXEC Privilege mode.
Border Gateway Protocol IPv4 (BGPv4)
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