I am having some difficulty blackholing a route. The route in question is received from a multihop BGP session (emulating cymru), and I am setting the dest attribute to RTD_BLACKHOLE. However, if the same route is received via another BGP session, the blackhole is overriden, as shown here: bird> show route 10.0.2.0/24 all 10.0.2.0/24 via 38.8.8.105 on em1 [bgp_cogent 17:38:53] * (100) [AS174i] Type: BGP unicast univ BGP.origin: IGP BGP.as_path: 174 BGP.next_hop: 38.8.8.105 BGP.local_pref: 100 blackhole [l3_bogons 18:00:03 from 10.0.1.255] (100) [AS3356i] Type: BGP unicast univ BGP.origin: IGP BGP.as_path: 3356 BGP.next_hop: 10.0.1.255 BGP.local_pref: 255 BGP.community: (65332,888) The relevant parts of my test configuration are below. Is there some trick to making the blackhole "absolute"? filter bgp_in_cogent { if ! rt_import_all(174) then reject; accept; } template bgp cymru_bogons_full { local as 68; multihop 255; export none; import filter { bgp_community.add((65332,888)); dest = RTD_BLACKHOLE; bgp_local_pref = 255; accept; }; } protocol bgp bgp_cogent from ebgp { neighbor 38.8.8.105 as 174; import filter bgp_in_cogent; } protocol bgp l3_bogons from cymru_bogons_full { local 162.9.5.3 as 68; neighbor 10.0.1.255 as 3356; } Thank you!