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Cell Relay Retreat>MPLS-OPS Archive>month:2001-Jun> msg00387



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RE: ATM Label stack processing

  • From: "Andrew Walding" <andy@cellstream.com>
  • Date: Fri, 29 Jun 2001 10:53:39 -0500
  • Importance: Normal
  • Resent-Date: Fri, 29 Jun 2001 13:53:48 -0400
  • To: "Javier Antich" <javier.antich@telindus.es>, "John Black" <john_black66@hotmail.com>, <mpls-ops@mplsrc.com>
  • X-OriginalArrivalTime: 29 Jun 2001 15:49:49.0060 (UTC) FILETIME=[20AF7440:01C100B3]

Javier - one small input...I would say that ATM LSRs 'may' not be able to
decrement the hop counter.

Regards,

Andy Walding
CellStream Inc.

> > 3.Does it mean that in mpls traceroute only two hops (ingress
> and egress
> > LER) will show up when traversing over ATM MPLS network? Same for TTL in
> > the
> > stack?
> 	[Javier Antich]  ATM-LSRs are not able to decrement the TTL value in
> the MPLS shim header. I am not sure if there is any mechanism so that the
> ingress node in the MPLS-ATM LSP decrements the TTL value by the number of
> hops. In any case the ATM-LSRs (ASAIK) do not appear in the traceroute.
> Normal Frame Based LSRs may appear, depending on how you
> configure your MPLS
> network.

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