Defining BGP Community Lists

This topic lists the Cisco IOS commands that are required to match routes based on attached BGP communities using community-lists.

You can use a standard community access-list to find community attributes in routing updates. A standard community-list is defined by its assigned list number, which can range from 1 to 99.

Community-lists are similar to standard IP access-lists in the following ways:

■ The router evaluates the lines in the community-list sequentially.

■ If no line matches communities that are attached to a BGP route, the route is implicitly denied.

Standard community-lists are different from standard IP access-lists in the following ways:

■ The keyword internet should be used to permit any community value.

■ If more values are listed in a single line, they all have to be in an update to produce a match.

© 2005, Cisco Systems, Inc. Route Selection Using Attributes 4-91

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