Hello! RFC5575 and newer RFC8955 define validation procedure for flowspec routes received by BGP protocol. While testing flowspec in bird 2.0.8 I've found strange behavior: # birdc show route protocol BGP4_IPPORT filtered BIRD 2.0.8 ready. Table T4_IPPORT: 185.23.164.48/28 unicast [BGP4_IPPORT 18:02:30.148] * (100) [AS8647i] via 193.25.180.134 on bxe0 -- the unicast route is filtered by import policy. # birdc show route BIRD 2.0.8 ready. Table FLOW4: flow4 { dst 185.23.164.48/28; proto 1; icmp type 8; } [BGP4_IPPORT 18:02:31.214 from 193.25.180.134] * (100) [AS8647i] -- flow route remains. So the question, is feasibility check implemented in bird? Thank you! -- Alexander Shikov Technical Staff, Digital Telecom IX Tel.: +380 44 201 14 07 Mob.: +380 50 410 30 57 http://dtel-ix.net/