match as-path — route-map
path-list-numberno match as-path
BGP route filtering
This command allows you to require that any route in a route map pass an AS path access list. Routes that are permitted by the list undergo further processing. You might use this command to create a route map that modifies routing metrics or changes the routes in some way, depending on the routes’ AS path. These modifications are applied only to routes matching the AS path access list.
The following code filters all routes to be sent to the neighboring router 10.10.1.1 through the AS path list 1. The AS path list is applied in the route map
test-as-path, which adds our AS number (300) to all routes that match this list.
route-map test-as-path match as-path 1 set as-path prepend 300 ! ip as-path access-list 1 permit .* ! router bgp 300 neighbor 10.10.1.1 route-map set-as-path out