Hi, On one router I have an interface that used to be connected to another machine, so the state is NO-CARRIER: core01-arendal ~ # ip addr show enp1s0 2: enp1s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000 link/ether 00:0d:b9:48:c1:c0 brd ff:ff:ff:ff:ff:ff inet 10.0.4.1/31 scope global enp1s0 valid_lft forever preferred_lft forever inet6 2001:4640:a14f:fffd::2/127 scope global valid_lft forever preferred_lft forever inet6 fe80::20d:b9ff:fe48:c1c0/64 scope link valid_lft forever preferred_lft forever On another router, I still have this route from OSPF, advertised from core01-arendal: core02-arendal ~ # birdc BIRD 2.0.8 ready. bird> show route all for 10.0.4.0 Table master4: 10.0.4.0/31 unicast [ospf_ipv4 17:51:54.613] * E2 (150/1/10000) [45.91.126.254] via 10.0.4.5 on enp2s0 Type: OSPF-E2 univ igp_metric: 1 OSPF.metric1: 1 OSPF.metric2: 10000 OSPF.tag: 0x00000000 OSPF.router_id: 45.91.126.254 bird> show route all for 2001:4640:a14f:fffd::2 Table master6: 2001:4640:a14f:fffd::2/128 unicast [ospf_ipv6 17:51:58.613] * I (150/1) [45.91.126.254] via fe80::20d:b9ff:fe48:c1c2 on enp2s0 Type: OSPF univ igp_metric: 1 OSPF.metric1: 1 OSPF.router_id: 45.91.126.254 bird> And here is the export filter for OSPF: export filter { if (proto = "kernel_grt_ipv4" || proto = "direct1" || source = RTS_DEVICE) then { accept; } else reject; }; Given that the interface is unplugged, I expected bird to withdrawn the route rather than keeping it into OSPF. Regards, -- Alarig Le Lay