BIRD ignored routes

Nat J net at alcifer.org
Tue Mar 10 20:04:53 CET 2015


Hi All,

I’m having an issue with bird ignoring some prefixes it’s receiving. I'm
new to bird and may be overlooking something simple. The config is
essentially this

[1] Exabpg1:AS_X < — > BIRD:AS_Y (route-server)
[2] Exabgp2:AS_X < — > BIRD:AS_Y (route-server)

[3] BIRD:AS_Y < — > BIRD:AS_Z

[1] & [2] behave as expected, however when the route-server exports to the
2nd BIRD instance the routes are ignored. The debug file unfortunately
makes no mention of the routes being ignored. Any suggestions on how I can
find the cause for those being ignored.

Attached are the configs and outputs from BIRD

Thanks

-nat
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BIRD-RS

bird> sh route all
192.168.200.0/24   via 192.168.3.4 on eth1 [Exa1 13:14:43] * (100) [AS65010i]
        Type: BGP unicast univ
        BGP.origin: IGP
        BGP.as_path: 65010
        BGP.next_hop: 192.168.3.4
        BGP.local_pref: 100
                   via 192.168.4.4 on eth1 [Exa2 13:14:40] (100) [AS65010i]
        Type: BGP unicast univ
        BGP.origin: IGP
        BGP.as_path: 65010
        BGP.next_hop: 192.168.4.4
        BGP.local_pref: 100
bird>


bird> show protocols all
name     proto    table    state  since       info
device1  Device   master   up     13:14:08
  Preference:     240
  Input filter:   ACCEPT
  Output filter:  REJECT
  Routes:         0 imported, 0 exported, 0 preferred
  Route change stats:     received   rejected   filtered    ignored   accepted
    Import updates:              0          0          0          0          0
    Import withdraws:            0          0        ---          0          0
    Export updates:              0          0          0        ---          0
    Export withdraws:            0        ---        ---        ---          0

Exa1     BGP      master   up     13:14:43    Established
  Description:    Exa1
  Preference:     100
  Input filter:   ACCEPT
  Output filter:  ACCEPT
  Routes:         1 imported, 0 exported, 1 preferred
  Route change stats:     received   rejected   filtered    ignored   accepted
    Import updates:              1          0          0          0          1
    Import withdraws:            0          0        ---          0          0
    Export updates:              2          1          0        ---          1
    Export withdraws:            0        ---        ---        ---          1
  BGP state:          Established
    Neighbor address: 192.168.3.4
    Neighbor AS:      65010
    Neighbor ID:      192.168.3.4
    Neighbor caps:    AS4 add-path-rx add-path-tx
    Session:          external route-server AS4
    Source address:   192.168.3.3
    Hold timer:       131/180
    Keepalive timer:  19/60

Exa2     BGP      master   up     13:14:40    Established
  Description:    Exa2
  Preference:     100
  Input filter:   ACCEPT
  Output filter:  ACCEPT
  Routes:         1 imported, 1 exported, 0 preferred
  Route change stats:     received   rejected   filtered    ignored   accepted
    Import updates:              1          0          0          0          1
    Import withdraws:            0          0        ---          0          0
    Export updates:              2          1          0        ---          1
    Export withdraws:            0        ---        ---        ---          0
  BGP state:          Established
    Neighbor address: 192.168.4.4
    Neighbor AS:      65010
    Neighbor ID:      192.168.4.4
    Neighbor caps:    AS4 add-path-rx add-path-tx
    Session:          external route-server AS4
    Source address:   192.168.4.3
    Hold timer:       164/180
    Keepalive timer:  30/60

ExaOut   BGP      master   up     14:29:55    Established
  Description:    main exa
  Preference:     100
  Input filter:   ACCEPT
  Output filter:  ACCEPT
  Routes:         0 imported, 2 exported, 0 preferred
  Route change stats:     received   rejected   filtered    ignored   accepted
    Import updates:              0          0          0          0          0
    Import withdraws:            0          0        ---          0          0
    Export updates:              2          0          0        ---          2
    Export withdraws:            0        ---        ---        ---          0
  BGP state:          Established
    Neighbor address: 192.168.5.4
    Neighbor AS:      65011
    Neighbor ID:      192.168.5.4
    Neighbor caps:    refresh restart-aware AS4 add-path-rx add-path-tx
    Session:          external route-server AS4 add-path-rx add-path-tx
    Source address:   192.168.5.3
    Hold timer:       161/240
    Keepalive timer:  8/80

bird>


================

bird> show protocols all
name     proto    table    state  since       info
device1  Device   master   up     14:49:14
  Preference:     240
  Input filter:   ACCEPT
  Output filter:  REJECT
  Routes:         0 imported, 0 exported, 0 preferred
  Route change stats:     received   rejected   filtered    ignored   accepted
    Import updates:              0          0          0          0          0
    Import withdraws:            0          0        ---          0          0
    Export updates:              0          0          0        ---          0
    Export withdraws:            0        ---        ---        ---          0

EXT      BGP      master   up     14:49:18    Established
  Preference:     100
  Input filter:   ACCEPT
  Output filter:  ACCEPT
  Routes:         0 imported, 0 exported, 0 preferred
  Route change stats:     received   rejected   filtered    ignored   accepted
    Import updates:              0          0          0          0          0
    Import withdraws:            2          0        ---          2          0
    Export updates:              0          0          0        ---          0
    Export withdraws:            0        ---        ---        ---          0
  BGP state:          Established
    Neighbor address: 192.168.5.3
    Neighbor AS:      65012
    Neighbor ID:      192.168.5.3
    Neighbor caps:    refresh restart-aware AS4 add-path-rx add-path-tx
    Session:          external AS4 add-path-rx add-path-tx
    Source address:   192.168.5.4
    Hold timer:       202/240
    Keepalive timer:  73/80

bird>

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