The MPLS-OPS Archive

[Javier Antich <javier.antich@telindus.es>]

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Javier Antich Romaguera
Network Consultant
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TELINDUS 
Pza. Ciudad de Viena, 6-2º
28040 Madrid 
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javier.antich@telindus.es
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> -----Mensaje original-----
> De:	John Black [SMTP:john_black66@hotmail.com]
> Enviado el:	jueves 28 de junio de 2001 13:07
> Para:	javier.antich@telindus.es; mpls-ops@mplsrc.com
> Asunto:	RE: ATM Label stack processing
> 
> Still not clear for me:
> 1.Does ATM LER setup LSP over ATM by means of LDP?
	[Javier Antich]  Yes.
> 2.Does it mean that label stack shall contain only LER hops and no ATM LSR
> 
> hops?
	[Javier Antich]  No, it does not mean that. A label stack has no
relationship with the number and type of hops in an LSP. So, there are not
as much labels as hops in the LSP. MPLS does not work that way. 
> 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.

> thanks
> jb
> 
> 
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