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Matching a Community List Exactly

You can use the exact-match keyword for the match community command to specify that a match exists only for the exact community numbers specified in the community list. The exact-match keyword applies only to a standard community list—that is, one not specified by a regular expression. You cannot use the exact-match keyword with a community list that is specified by a regular expression.

Consider the following example:



host1(config)#ip community-list 1 permit 100
200 300 

host1(config)#exit 

host1#show ip community-list 

Community standard list 1
     permit 0:100 0:200 0:300
host1(config)#route-map example1 permit 10 

host1(config-route-map)#match community 1
exact-match 

host1(config)#exit 

host1#show route-map example1 

route-map example, permit, sequence 10
  Match clauses:
    community (community-list filter): 1 exact-match

The route map example1 permits a route only if the route contains community 100 and community 200 and community 300 and no additional communities.

If you do not specify the exact-match option, the route map also permits a match on a route that contains additional communities. For example, a route that contains communities 100, 200, 300, 400, and 450 matches.

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