Hello, continuing my travel now with OSPF, we have found two cases to crash bird via birdc: bird> show ospf topology all ospf_v4 Connection closed by server [00:50] replacement-router1.place5:~# ps aux | grep bird 14220 root 0:00 grep bird bird> show ospf state ospf_v4 Connection closed by server [23:44] router1.place6:~# birdc Unable to connect to server control socket (/var/run/bird.ctl): Connection refused The config leading to this is attached below. Best regards, Nico p.s.: In the documentation for the "instance id" it says "Default value is 0 unless OSPFv3-AF extended address families are used, see RFC 5838 for that case." And further above it says that RFC5838 is enabled by default. However shouldn't it be 64 in case of an ipv4 channel in ospf according to rfc5838? protocol ospf v3 ospf_v6 { instance id 0; ipv6 { import all; export all; }; area 0 { interface "bond0.8" { cost 5; hello 5; retransmit 2; wait 10; dead 20; }; }; } protocol ospf v3 ospf_v4 { instance id 64; ipv4 { import all; export all; }; area 0 { interface "bond0.8" { cost 5; hello 5; retransmit 2; wait 10; dead 20; }; }; } -- Modern, affordable, Swiss Virtual Machines. Visit www.datacenterlight.ch