Hi, I have some peers who want community string 666 set to null route, and some who want :0, I'm trying to setup bird so when I null route a /32, it gets properly null routed everywhere. I'm stuck with the routes not actually exported to the peers, I'm not sure why. Any suggestions would be very much appreciated! define NULLROUTE = [ 198.51.100.1/32, 198.51.100.2/32 ]; define OURNETS = [ 198.252.153.0/24, 198.51.100.0/24 ]; protocol static static_bgp { import all; preference 10000; route 198.252.153.0/24 reject; route 198.51.100.0/24 blackhole; } protocol bgp special { import filter bgp_in; export filter bgp_special_bl; multihop 255; local as ASN; neighbor x.x.x.x as xxxxx; graceful restart; passive; } protocol bgp cogent_blackhole { description "Cogent blackhole server"; local as ASN; neighbor 66.28.8.1 as 174; multihop 255; import filter bgp_in; export filter bgp_nullroute; } function our_network() { return net ~ OURNETS; } function nullroute(prefix set nroute) { if our_network() then { bgp_community = -empty-; bgp_community.add((ASN,666)); return net ~ nroute; } else { reject; } } filter bgp_special_bl { nullroute(NULLROUTE); if (ASN,666) ~ bgp_community && net.len = 32 && our_network() then { bgp_community = -empty-; bgp_community.add((ASN,0)); accept; } else { reject; } } filter bgp_nullroute { nullroute(NULLROUTE); if (ASN,666) ~ bgp_community && net.len = 32 && our_network() then { accept; } else { reject; } } all of these return empty: birdc show route filter bgp_special_bl birdc show route filter bgp_nullroute birdc show route export bgp_special birdc show route export cogent_blackhole I'd love any suggestions of things to try, or if you have a better way to do this, i'm all ears. -- micah