Traceroute across MPLS core network shows egress router twice

From: Lars L. Christensen (lars@perseus.dk)
Date: Thu Mar 13 2008 - 12:06:38 ARST

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Hi group

I've seen a weird phenomenon on our MPLS network. When I traceroute to an IP
address either directly connected to my egress PE router or to a router
connected to the PE, I get a double response from the egress PE router.

A traceroute shows something like this:

1 192.168.1.1
2 80.160.40.33
3 83.88.7.130
4 83.88.20.209
5 83.88.30.21
6 83.88.20.30
7 62.242.207.122
8 217.116.255.95
9 217.116.238.209
10 88.212.126.237
11 88.212.126.237
12 217.74.212.54

As shown, hop 10 and 11 is the same.

I don't know why this is, but you guys may have seen this behaviour before
or know why...

Regards,
Lars Christensen

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