BGP Distribute List Filtering

Distribute List filtering allows filtering of network prefixes on BGP using access control lists on a neighbour specific basis.

The distribution list can be activated on a neighbour with the command neighbour x.x.x.x distribute-list y followed by in for inbound filtering or out for outbound filtering

ip access-list extended restrict-routes
 ! Allows 192.168.0.0 - 192.168.255.255 with any prefix length
 permit ip 192.168.0.0 0.0.255.255 host 255.255.255.255
! Applying distribute list 'restrict-routes' inbound from 1.2.3.4
neighbour 1.2.3.4 distribute-list restrict-routes in