Possible explanations for a large hop in latency

Mikael Abrahamsson swmike at swm.pp.se
Fri Jun 27 01:16:09 UTC 2008

On Thu, 26 Jun 2008, John T. Yocum wrote:

> The explanation I got, was that the latency seen at the first hop was 
> actually a reply from the last hop in the path across their MPLS 
> network. Hence, all the following hops had very similar latency.
> Personally, I thought it was rather strange for them to do that. And, 
> I've never seen that occur on any other network.

This is standard for MPLS, the ICMP TTL expire message is sent along the 
LSP and returned via the router at the end of the LSP.

Mikael Abrahamsson    email: swmike at swm.pp.se

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