BGP: receiving routes the routes you receive and accept from another AS influence what traffic is send there where you want to send traffic is a matter of policy optimize for cost optimize for quality accept only certain routes (belonging to that AS) BGP implementations have complex filters to allow you to exactly define what to accept and what routes to prefer. allow from 178.255.1.202 prefix 192.0.2.0/23 set localpref 180 allow from 195.245.114.1 prefixlen 8 - 24 set localpref 130 allow from group "BGP-Peers" set nexthop self deny from any prefix 0.0.0.0/0 prefixlen <= 7