The MPLS WG Archive

["Andrew G. Malis" <andymalis@comcast.net>]

Bob,

The PWE3 working group has defined a non-IP-forwarding use for the 
innermost label on the stack - it identifies a logical or physical layer 1 
or layer 2 port on a router, plus optionally a layer 2 multiplexing tag or 
label (FR DLCI, Ethernet VLAN tag, ATM VPI/VCI, etc.).

This mechanism is also used by the L2VPN working group for VPLS and other 
layer 2 VPNs over MPLS.

Cheers,
Andy

----------

At 5/27/2005 18:32 +0800, Bob Anders wrote:
>Dear MPLS-Experts,
>
>I am aware that MPLS is intended to be used for switching purposes,
>but I was wondering if anyone knows about implementations or plans
>that make use of MPLS in a non-standard way, like
>
>- MPLS is still used to make forwarding decisions, but the stack
>contains also non-forwarding relevant information either in Exp bits
>or in separate labels (type of information possibly identified by Exp
>bits)
>Or
>- The MPLS stack is only used as a "vehicle" to encode additional
>non-forwarding relevant information. Forwarding decisions are still
>based on the underlying protocol (e.g. IPv4).
>
>When talking about non-forwarding relevant data, I am thinking of
>information used for encryption, network statistics, billing, etc ...
>
>If there is anything out there (or maybe planed by IETF or whoever)
>that makes use of MPLS-like stacks as described above, I would be
>happy to hear about it (URLs, papers, ...).
>
>Thanks and have a nice weeked!
>
>   Bob
>
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