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 220.127.116.11 neighbour 18.104.22.168 distribute-list restrict-routes in