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[mpls] Unique Identififcation of LSP

  • From: George Swallow <swallow@cisco.com>
  • Date: Wed, 29 Nov 2006 13:52:58 -0500
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> I have read that the 5-tuple {tunnel-endpoint address,tunnel-ID, extended
> tunnel-ID, sender address, and LSP ID} can uniquely identify an LSP. My
> question is it locally unique between two nodes or globally unique
> identifcation
> 
> A----B-----C------E
>        \     /
>          D
> 
> For example two LSPs are set up from A to E via the same tunnel. i.e. the
> have same end points and same path ABDE. Will the 5 tuple uniquely identify
> any LSP across any two nodes e.g. B and D? Will the values remain same for
> this LSP across two other nodes in the path e.g. C and E?

Yes, provided that the extended tunnel ID is a globally unique id.
(Normally this is set to the head-end's router ID).

...George

========================================================================
George Swallow             Cisco Systems                  (978) 936-1398
                           1414 Massachusetts Avenue
                           Boxborough, MA 01719

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