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How a Prefix List Is Evaluated

During prefix list evaluation, the policy framework software performs a longest-match lookup, which means that the software searches for the prefix in the list with the longest length. The order in which you specify the prefixes, from top to bottom, does not matter. The software then compares a route’s source address to the longest prefix.

You can use prefix list qualifiers for prefixes contained in a prefix list by configuring a prefix list filter. For more information, see Configuring Prefix Lists.

If a match occurs, the evaluation of the current term continues. If a match does not occur, the evaluation of the current term ends.

Note: If you specify multiple prefixes in the prefix list, only one prefix must match for a match to occur. The prefix list matching is effectively a logical OR operation.


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