In the following example, the route map called set-as-path is applied to outbound updates to the
neighbor 200.69.232.70.

The route map will prepend the autonomous system path “100 100” to routes that pass access list 1.
The second part of the route map is to permit the advertisement of other routes.

router bgp 100
network 171.60.0.0
network 172.60.0.0
neighbor 200.69.232.70 remote-as 200
neighbor 200.69.232.70 route-map set-as-path out
!
route-map set-as-path 10 permit
match address 1
set as-path prepend 100 100
!
route-map set-as-path 20 permit
match address 2
!
access-list 1 permit 171.60.0.0 0.0.255.255
access-list 1 permit 172.60.0.0 0.0.255.255
!
access-list 2 permit 0.0.0.0 255.255.255.255