bird & BGP over L2TP

Alexander Shikov a.shikov at
Thu Feb 12 10:41:47 CET 2015

Hi All!

I'd like to ask for help with some strange issue.
I have a L2TP tunnel between two routers. Both routers are
running on bird 1.4.5 and CentOS.
L2TP tunnel has /30 addressing.

For some strange reason bird does not install next-hop
received by BGP:

bird> show route all    via on ens1f0 [kiev_rtr 2015-02-12 11:13:17 from] * (100/?) [i]
        Type: BGP unicast univ
        BGP.origin: IGP
        BGP.local_pref: 100 is reachable:
[root at tunnel etc]# ping
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=1 ttl=54 time=40.8 ms
--- ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 40.818/40.818/40.818/0.000 ms

[root at tunnel etc]# arp -n
Address                  HWtype  HWaddress           Flags Mask            Iface             ether   aa:8a:10:bb:91:02   C                     tun1

Please advice.

Alexander Shikov
Technical Staff, Digital Telecom IX

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