In Route Map (see Route Map), we can match or set BGP communities attribute. Using this feature network operator can implement their network policy based on BGP communities attribute.
Following commands can be used in Route Map.
This command perform match to BGP updates using community list
word. When the one of BGP communities value match to the one of
communities value in community list, it is match. When
exact-match keyword is spcified, match happen only when BGP
updates have completely same communities value specified in the
This command manipulate communities value in BGP updates. When
none is specified as communities value, it removes entire
communities attribute from BGP updates. When community is not
none, specified communities value is set to BGP updates. If
BGP updates already has BGP communities value, the existing BGP
communities value is replaced with specified community value.
additive keyword is specified, community is appended
to the existing communities value.
This command remove communities value from BGP communities attribute. The word is community list name. When BGP route’s communities value matches to the community list word, the communities value is removed. When all of communities value is removed eventually, the BGP update’s communities attribute is completely removed.