bgp traceroute bounces between neighbors

DARYLE DIANIS · ‎05-19-2013

I see the following when I run a traceroute to this subnet. The traceroute bounces between my router and the MPLS provider until ttl expires. The routers are running bgp. The rest of my wan and routing is fine, what might be the cause of this? Obviously, pings to anything on this subnet fail.

traceroute 192.200.2.25

Type escape sequence to abort.

Tracing the route to 192.200.2.25

VRF info: (vrf in name/id, vrf out name/id)

1 10.210.100.1 4 msec 0 msec 8 msec

2 10.210.100.2 0 msec 0 msec 4 msec

3 10.210.100.1 4 msec 4 msec 4 msec

4 10.210.100.2 4 msec 4 msec 0 msec

5 10.210.100.1 8 msec 4 msec 8 msec

6 10.210.100.2 4 msec 4 msec 8 msec

Peter Paluch · ‎05-19-2013

Hello,

Do you perform any kind of route summarization/aggregation? Is it possible that you have a default route or a matching route installed towards your MPLS provider while he believes that the best path towards 192.200.2.25 is via yourself?

On the 10.210.100.2 (assuming that it is your CE router), what do these commands say? Can you post the output please?

show ip route 192.200.2.25

show ip cef 192.200.2.25

Thank you!

Best regards,

Peter