Hi, I've got very simple config: -- bird.conf -- log "/var/log/bird.log" { debug, trace, info, remote, warning, error, auth, fatal, bug }; debug protocols all; router id 172.0.0.1; protocol kernel { learn; persist; scan time 20; export all; } protocol device { scan time 10; } protocol static { route 0.0.0.0/0 drop; } protocol ospf MyOSPF { export all; area 0.0.0.0 { interface "dummy*" { }; }; area 10.0.0.0 { nssa; interface "eth*" { type nbma; }; }; } -- end -- If area 10.0.0.0 is commented it works as expected: bird> s o l Global Type LS ID Router Age Sequence Checksum 0005 192.168.54.255 172.0.0.1 3 80000001 c588 0005 192.168.55.0 172.0.0.1 3 80000001 ba92 0005 0.0.0.0 172.0.0.1 3 80000001 cb22 0005 10.155.74.255 172.0.0.1 3 80000001 cc31 Area 0.0.0.0 Type LS ID Router Age Sequence Checksum 0001 172.0.0.1 172.0.0.1 2 80000001 ac9b bird> but if I uncomment it (area 10) default route is disapearing: bird> sh ro 0.0.0.0/0 blackhole [static1 01:34] ! (200) via 10.5.2.1 on eth0 [kernel1 23:50] (10) 10.5.2.0/24 dev eth0 [MyOSPF 23:51] * I (150/10) [172.0.0.1] 10.155.74.0/24 via 10.155.74.5 on tun0 [kernel1 23:50] * (10) 192.168.54.0/24 via 10.155.74.5 on tun0 [kernel1 23:50] * (10) 192.168.55.0/24 via 10.155.74.5 on tun0 [kernel1 23:50] * (10) 172.0.0.1/32 dev dummy0 [MyOSPF 23:51] * I (150/0) [172.0.0.1] bird> s o l Global Type LS ID Router Age Sequence Checksum 0005 192.168.54.255 172.0.0.1 2 80000001 c588 0005 192.168.55.0 172.0.0.1 2 80000001 ba92 0005 10.155.74.255 172.0.0.1 2 80000001 cc31 Area 0.0.0.0 Type LS ID Router Age Sequence Checksum 0001 172.0.0.1 172.0.0.1 1 80000001 af97 0003 10.5.2.255 172.0.0.1 1 80000001 e2b1 Area 10.0.0.0 Type LS ID Router Age Sequence Checksum 0001 172.0.0.1 172.0.0.1 1 80000001 22b7 0003 172.0.0.1 172.0.0.1 1 80000001 847d bird> If the area 10.0.0.0 is stub or nssa default route is propagated in ospf. After changing area 10 to normal area and reconfiguring bird log says: <TRACE> MyOSPF: Going to remove LSA Type: 0005, Id: 0.0.0.0, Rt: 172.0.0.1, Age: 3600, Seqno: 0x7fffffff <TRACE> MyOSPF: Flushing AS-external-LSA for 0.0.0.0/0 <TRACE> MyOSPF: Flushing summary-LSA (id=0.0.0.0, type=3) <TRACE> MyOSPF: Going to remove LSA Type: 0003, Id: 0.0.0.0, Rt: 172.0.0.1, Age: 3600, Seqno: 0x7fffffff <TRACE> MyOSPF: Flushing AS-external-LSA for 0.0.0.0/0 Why 0.0.0.0/0 is removed from ospf while other kernel routes not? How redistribute it in multiple areas? other info: localhost:/tmp# ip ro sh 10.155.74.5 dev tun0 proto kernel scope link src 10.155.74.6 10.155.74.0/24 via 10.155.74.5 dev tun0 192.168.54.0/24 via 10.155.74.5 dev tun0 192.168.55.0/24 via 10.155.74.5 dev tun0 10.5.2.0/24 dev eth0 proto kernel scope link src 10.5.2.2 default via 10.5.2.1 dev eth0 lo: 127.0.0.1/8 eth0: 10.5.2.2/24 tun0: 10.155.74.6 peer 10.155.74.5/32 dummy0: 172.0.0.1/32 regards, -- Łukasz