From: Jian Gu (guxiaojian@gmail.com)
Date: Thu Mar 13 2008 - 16:23:33 ARST
Is PE advertising explicit null? it is possible that when 0 label is popped
and PE router has to do a second IP lookup, causing second IP TTL expiration
to be sent.
What version of IOS are you running? I don't see the same problem with 12.4T
.
On Thu, Mar 13, 2008 at 7:06 AM, Lars L. Christensen <lars@perseus.dk>
wrote:
> 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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