Route matching filter not exported
Alexander Zubkov
green at qrator.net
Fri May 17 16:49:30 CEST 2024
Hello,
Just curious. You've done "reload out" to your session after changing
the filter, right?
Regards,
Alexander
On Fri, May 17, 2024 at 4:45 PM Nico Schottelius via Bird-users
<bird-users at network.cz> wrote:
>
>
> 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
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