Hello bird users, I've a strange case in which a router does not export routes that are matched by the export filter. I am using the filter "static_and_bgp" inside our iBGP sessions: -------------------------------------------------------------------------------- bird> show protocol all ibgp_server137 Name Proto Table State Since Info ibgp_server137 BGP --- up 2024-05-12 Established BGP state: Established Neighbor address: 2a0a:e5c0:0:b::89 Neighbor AS: 199553 Local AS: 199553 Neighbor ID: 91.194.139.7 Local capabilities Multiprotocol AF announced: ipv4 ipv6 Route refresh Extended next hop IPv6 nexthop: ipv4 Graceful restart 4-octet AS numbers Enhanced refresh Long-lived graceful restart Neighbor capabilities Multiprotocol AF announced: ipv4 ipv6 Route refresh Extended next hop IPv6 nexthop: ipv4 Graceful restart 4-octet AS numbers Enhanced refresh Long-lived graceful restart Session: internal AS4 Source address: 2a0a:e5c0:0:b::91 Hold timer: 197.601/240 Keepalive timer: 4.476/80 Channel ipv6 State: UP Table: master6 Preference: 100 Input filter: ACCEPT Output filter: static_and_bgp Routes: 204647 imported, 2 exported, 204647 preferred Route change stats: received rejected filtered ignored accepted Import updates: 6285634 0 0 3097 6282537 Import withdraws: 3559063 0 --- 189 3558874 Export updates: 6768067 6387362 37995 --- 342710 Export withdraws: 3370586 --- --- --- 334365 BGP Next hop: 2a0a:e5c0:0:b::91 fe80::2f0:cbff:fefe:b70c IGP IPv6 table: master6 Channel ipv4 State: UP Table: master4 Preference: 100 Input filter: ACCEPT Output filter: static_and_bgp Routes: 947321 imported, 3 exported, 947318 preferred Route change stats: received rejected filtered ignored accepted Import updates: 22332349 0 0 2202 22330147 Import withdraws: 15475598 0 --- 343 15475255 Export updates: 24213451 22602108 0 --- 1611343 Export withdraws: 14527850 --- --- --- 1598351 BGP Next hop: 2a0a:e5c0:0:b::91 fe80::2f0:cbff:fefe:b70c IGP IPv4 table: master4 IGP IPv6 table: master6 -------------------------------------------------------------------------------- As you can see, the router in question only exports 2 IPv6 routes and 3 IPv4 routes and uses the filter "static_and_bgp". When I check the route count matching the filter, the numbers look very different: -------------------------------------------------------------------------------- bird> show route filter static_and_bgp count 2841971 of 2841971 routes for 947325 networks in table master4 613945 of 613983 routes for 204686 networks in table master6 Total: 3455916 of 3455954 routes for 1152011 networks in 2 tables bird> -------------------------------------------------------------------------------- And looking at some routes in detail: -------------------------------------------------------------------------------- bird> show route filter static_and_bgp Table master4: 0.0.0.0/0 unicast [ibgp_server137 11:03:59.224 from 2a0a:e5c0:0:b::89] * (100/?) [AS209898i] via fe80::3eec:efff:fed2:d1e4 on eth0 unicast [outgoing_server120 08:53:28.568] (100) [AS209898i] via 2a0a:e5c0:31:4::1 on tun1 unicast [outgoing_server121 08:55:44.577] (100) [AS209898i] via 2a0a:e5c0:32:4::1 on tun0 49.14.107.0/24 unicast [ibgp_server137 11:03:59.224 from 2a0a:e5c0:0:b::89] * (100/?) [AS45271i] via fe80::3eec:efff:fed2:d1e4 on eth0 unicast [outgoing_server120 08:55:43.482] (100) [AS45271i] via 2a0a:e5c0:31:4::1 on tun1 unicast [outgoing_server121 08:55:44.577] (100) [AS45271i] via 2a0a:e5c0:32:4::1 on tun0 181.123.200.0/22 unicast [ibgp_server137 11:03:59.224 from 2a0a:e5c0:0:b::89] * (100/?) [AS23201i] via fe80::3eec:efff:fed2:d1e4 on eth0 unicast [outgoing_server120 08:55:30.698] (100) [AS23201i] via 2a0a:e5c0:31:4::1 on tun1 unicast [outgoing_server121 08:55:44.577] (100) [AS23201i] via 2a0a:e5c0:32:4::1 on tun0 88.218.186.0/24 unicast [ibgp_server137 11:03:59.224 from 2a0a:e5c0:0:b::89] * (100/?) [AS62240i] via fe80::3eec:efff:fed2:d1e4 on eth0 unicast [outgoing_server120 08:55:22.108] (100) [AS62240i] via 2a0a:e5c0:31:4::1 on tun1 unicast [outgoing_server121 08:55:44.577] (100) [AS62240i] via 2a0a:e5c0:32:4::1 on tun0 -------------------------------------------------------------------------------- I verified that 2a0a:e5c0:31:4::1 and 2a0a:e5c0:32:4::1 are resolvable via OSPF on the other routers: -------------------------------------------------------------------------------- bird> show route for 2a0a:e5c0:32:4::1 Table master6: 2a0a:e5c0:32:4::/64 unicast [ospf6 2024-05-12] * I (150/20) [91.194.139.99] via fe80::2f0:cbff:fefe:b70c on eth2 unicast [outgoing_server120 11:11:16.933] (100) [AS209898i] via 2a0a:e5c0:31:2::1 on oserver120 bird> -------------------------------------------------------------------------------- But this should not matter at this stage, because the originating router does not seem to try to send this route. What am I missing, why is a route matching the same filter not being exported? Best regards, Nico -- Sustainable and modern Infrastructures by ungleich.ch