AS-path lists for BGP

Use AS-path lists to filter inbound or outbound BGP route updates. If the route update contains an AS-path attribute that matches an entry in the AS-path list, the router processes the route based on the configured permit or deny condition.

Configure multiple AS-path entries in an AS-path list by using the same AS-path list name. The router processes the first matching entry. You can also configure an AS-path list to compare the AS numbers against a regular expression.