Possible explanations for a large hop in latency

Mikael Abrahamsson swmike at swm.pp.se
Fri Jun 27 06:50:52 UTC 2008

On Thu, 26 Jun 2008, Frank Bulk - iNAME wrote:

> Interestingly enough, when I trace from my Cisco router it seems to show
> some MPLS labels after the hop of interest ( to,
> only 24 msec here!).  I'm not sure how our Cisco box derives these from a
> foreign network.

The ICMP packet (TTL exceeded in transit) contains a copy of the packet 
which TTL expired, including the labels, so label information is available 
to traceroute.

Mikael Abrahamsson    email: swmike at swm.pp.se

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