IXP Configuration ----------------- This configuration is for one of the routers present at the IXP used in the classroom exercise. router bgp 100 no synchronization no auto-summary bgp dampening network 80.248.70.128 mask 255.255.255.240 neighbor 80.248.70.2 remote-as 1100 neighbor 80.248.70.2 description IXP peering with Table B neighbor 80.248.70.2 version 4 neighbor 80.248.70.2 prefix-list AS1100-in in neighbor 80.248.70.2 prefix-list to-IXP out neighbor 80.248.70.3 remote-as 200 neighbor 80.248.70.3 description IXP peering with Table C neighbor 80.248.70.3 version 4 neighbor 80.248.70.3 prefix-list AS200-in in neighbor 80.248.70.3 prefix-list to-IXP out neighbor 80.248.70.4 remote-as 1200 neighbor 80.248.70.4 description IXP peering with Table D neighbor 80.248.70.4 version 4 neighbor 80.248.70.4 prefix-list AS1200-in in neighbor 80.248.70.4 prefix-list to-IXP out neighbor 80.248.70.5 remote-as 300 neighbor 80.248.70.5 description IXP peering with Table E neighbor 80.248.70.5 version 4 neighbor 80.248.70.5 prefix-list AS300-in in neighbor 80.248.70.5 prefix-list to-IXP out neighbor 80.248.70.6 remote-as 1300 neighbor 80.248.70.6 description IXP peering with Table F neighbor 80.248.70.6 version 4 neighbor 80.248.70.6 prefix-list AS1300-in in neighbor 80.248.70.6 prefix-list to-IXP out neighbor 80.248.70.7 remote-as 400 neighbor 80.248.70.7 description IXP peering with Table G neighbor 80.248.70.7 version 4 neighbor 80.248.70.7 prefix-list AS400-in in neighbor 80.248.70.7 prefix-list to-IXP out ! ip route 80.248.70.128 255.255.255.240 null0 ! pull up route for BGP ! ! prefixes I'm going to send to the IXP - each announcement is the same so ! I can use just one prefix-list for all peers ! ip prefix-list to-IXP permit 80.248.70.128/28 ! ! prefix-list filters for each IXP peer. Each peer will send me a different ! prefix so I need a different filter for each one ! ip prefix-list AS1100-in permit 80.248.70.144/28 ip prefix-list AS200-in permit 80.248.70.160/28 ip prefix-list AS1200-in permit 80.248.70.176/28 ip prefix-list AS300-in permit 80.248.70.192/28 ip prefix-list AS1300-in permit 80.248.70.208/28 ip prefix-list AS400-in permit 80.248.70.224/28 !