Hello, I am having trouble advertising my loopback interface into ospf as passive. root@nms001] # birdc BIRD 1.6.3 ready. bird> show route 10.192.111.0/24 dev bond0 [direct1 2018-03-05] * (240) 10.250.0.0/32 dev lo [direct1 2018-03-26] * (240) I am currently advertising the route into the ospf domain using a filter as a workaround but this advertises as an External route (Type 5 LSA). I was wondering if there is a way to advertise the interface route as a Type1 LSA. Output from OSPF router in the same Area0 user@host> show ospf database OSPF database, Area 0.0.0.0 Type ID Adv Rtr Seq Age Opt Cksum Len Router 10.192.1.61 10.192.1.61 0x80001d93 1028 0x22 0x4d67 96 Router 10.192.1.62 10.192.1.62 0x80001d90 2565 0x22 0xb3f7 96 Router 10.192.1.63 10.192.1.63 0x80001d8e 2537 0x22 0x1889 96 Router 10.192.1.64 10.192.1.64 0x80001d76 2558 0x22 0xa805 96 Router 10.192.1.65 10.192.1.65 0x80001d74 2568 0x22 0xd96 96 Router 10.192.1.66 10.192.1.66 0x80001d7b 524 0x22 0x5f31 96 Router *10.192.1.67 10.192.1.67 0x8000167c 2942 0x22 0xae29 444 Router 10.192.1.68 10.192.1.68 0x80001671 2947 0x22 0x9523 420 Router 10.192.1.69 10.192.1.69 0x80001d7c 2559 0x22 0x9cde 96 Router 10.192.1.70 10.192.1.70 0x80001981 2567 0x22 0xfe6f 96 Router 10.192.1.71 10.192.1.71 0x8000198b 658 0x22 0x8f8d 96 Router 10.192.1.72 10.192.1.72 0x80001984 174 0x22 0xb999 96 Router 10.192.1.73 10.192.1.73 0x80001995 2567 0x22 0xf73e 96 Router 10.192.1.74 10.192.1.74 0x80001d7b 2559 0x22 0x80bf 96 Router 10.192.1.75 10.192.1.75 0x800013a7 1196 0x22 0xa66b 96 Router 10.192.1.76 10.192.1.76 0x800013a3 1342 0x22 0xffa 96 Router 10.192.1.77 10.192.1.77 0x80000060 839 0x22 0x3e09 72 Router 10.192.1.81 10.192.1.81 0x8000003e 55 0x22 0xf6a4 84 Router 10.192.1.82 10.192.1.82 0x8000003d 2943 0x22 0x147d 84 Router 10.192.111.11 10.192.111.11 0x8000072f 493 0x2 0x8e79 36 Network 10.192.111.1 10.192.1.71 0x8000044a 658 0x22 0x67de 32 OSPF AS SCOPE link state database Type ID Adv Rtr Seq Age Opt Cksum Len Extern *0.0.0.0 10.192.1.67 0x800015a3 1463 0x22 0x816a 36 Extern 0.0.0.0 10.192.1.68 0x8000120d 1465 0x22 0xb1d2 36 Extern 10.250.0.0 10.192.111.11 0x80000338 663 0x2 0x779f 36 Bird configuration: root@nms001] # cat /etc/bird.conf router id 10.192.111.11; filter loopback { if net ~ 10.250.0.0/32 then accept; else reject; } protocol direct { interface "bond0", "lo*"; # Restrict network interfaces it works with } protocol kernel { learn; # Learn all alien routes from the kernel persist; # Don't remove routes on bird shutdown scan time 20; # Scan kernel routing table every 20 seconds import none; # Default is import all export all; # Default is export none } protocol device { scan time 10; # Scan interfaces every 10 seconds } ############ ### OSPF ### ############ protocol ospf MyOSPF { tick 2; import none; export filter loopback; area 0.0.0.0 { stub no; interface "bond0" { hello 10; retransmit 6; cost 10; transmit delay 5; dead count 4; wait 50; type broadcast; }; }; } root@nms001] # birdc BIRD 1.6.3 ready. bird> show route 10.192.111.0/24 dev bond0 [direct1 2018-03-05] * (240) 10.250.0.0/32 dev lo [direct1 2018-03-26] * (240)