The MPLS-OPS Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] RE: ATM Label stack processing
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Javier Antich Romaguera
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> -----Mensaje original-----
> De: John Black [SMTP:john_black66@hotmail.com]
> Enviado el: jueves 28 de junio de 2001 11:24
> Para: mpls-ops@mplsrc.com
> Asunto: ATM Label stack processing
>
> My understanding of label stack processing in ATM is that top most label
> is
> encoded as VPI/VCI pair, the rest of stack is encoded in AAL5 PDUs.
> 1.Does it mean that every ATM switch has to reassemble AAL5 frame to read
> the next label from the stack?
[Javier Antich] ATM switches acting as LSRs do not need to read the
next label. They do only ATM switching based on the VPI/VCI values with are
the MPLS outer-most label. They would need to reassemble if they act as LER.
> 2. When LSP over ATM setup is completed - is there any need in label
> stacks
> any more or cells just follow each other and switch swaps labels based on
> information read from original label stack?
[Javier Antich] I do not understand actually the question, but
cells are switched like normal ATM cells based on the VPI/VCI values. No
matter if inside them a frame is encapsulated which has more labels.
Remember that an ATM-LSR is not able to push or pop labels, it is only able
to swap the outer label (encoded as VPI/VCI).
> thanks
> jb
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