Permit and Deny Clauses
Route maps can have permit and deny clauses. The deny clause rejects route matches from redistribution. You can use an ACL as the matching criterion in the route map. Because ACLs also have permit and deny clauses, the following rules apply when a packet matches the ACL:
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ACL permit + route map permit: routes are redistributed.
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ACL permit + route map deny: routes are not redistributed.
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ACL deny + route map permit or deny: the route map clause is not matched, and the next route-map clause is evaluated.