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RE: ATM Label stack processing

From: Javier Antich <javier.antich@telindus.es>
Date: Fri, 29 Jun 2001 19:13:27 +0200
Resent-Date: Fri, 29 Jun 2001 14:42:20 -0400
To: "'Andrew Walding '" <andy@cellstream.com>, Javier Antich <javier.antich@telindus.es>, "'John Black '" <john_black66@hotmail.com>, "'mpls-ops@mplsrc.com '" <mpls-ops@mplsrc.com>

You are right, an ATM LSR might be able to do it. 

-----Original Message-----
From: Andrew Walding
To: Javier Antich; John Black; mpls-ops@mplsrc.com
Sent: 29/06/01 17:53
Subject: RE: ATM Label stack processing

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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