Hi. I'm playing with ospf and got stuck on a virtual link with a cisco router. The cisco virtual link is up and I can see hello packets coming to the linux router but nothing going out. It's connected through area 0.0.0.1. I can see both routers in lsdb. debug in bird produces following: OSPF: Received packet for unknown vlink (ID 192.168.70.1, IP 10.5.1.1) I assume I'm doing something wrong but I can't see what as the config seems very simple. bird RID 10.4.7.1: area 0.0.0.1 { interface "r2" { cost 10; type pointopoint; neighbors { 10.4.8.2; }; }; virtual link 192.168.70.1 { }; }; bird> show ospf interfaces Virtual link to 192.168.70.1: Peer IP: 0.0.0.0 Transit area: 0.0.0.1 (1) Interface: "(none)" State: down Priority: 0 Cost: 0 Hello timer: 10 Wait timer: 40 Dead timer: 40 Retransmit timer: 5 bird> show ospf lsadb area 1 type 1 Area 0.0.0.1 Type LS ID Router Age Sequence Checksum 0001 192.168.60.1 192.168.60.1 353 80000008 5485 0001 192.168.70.1 192.168.70.1 232 80000006 b37b 0001 10.4.7.1 10.4.7.1 146 80000019 1312 cisco RID 192.168.70.1: router ospf 1 area 0.0.0.1 virtual-link 10.4.7.1 R3#show ip ospf virtual-links Virtual Link OSPF_VL2 to router 10.4.7.1 is up Run as demand circuit DoNotAge LSA allowed. Transit area 0.0.0.1, via interface FastEthernet0/1, Cost of using 20 Transmit Delay is 1 sec, State POINT_TO_POINT, Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:04 thanks for help Martin