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AS-path Lists

For an AS-path access list, the input string is the AS path of the routes to which the list is applied with the route-map or neighbor filter-list commands. If the AS path matches the regular expression in the access list, the route matches the access list.

Example

The following commands apply access list 1 to routes inbound from BGP peer 10.5.5.2. Access list 1 uses a regular expression to deny routes that originate in autonomous system 32.



host1(config-router)#neighbor 10.5.5.2 remote-as
32 

host1(config-router)#neighbor 10.5.5.2 filter-list
1 in 

host1(config-router)#exit 

host1(config)#ip as-path access-list 1 deny 32$

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