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draft-ietf-mpls-diff-ext-07.txt

  • From: Francis Arts <francis.arts@alcatel.be>
  • Date: Thu, 30 Nov 2000 08:38:58 +0100
  • Organization: Alcatel Telecom


Hello,

The draft-ietf-mpls-diff-ext-07.txt defines 2 types of LSPs - E-LSPs and
L-LSPs. For the DIFF SERV object defined in this draft, also 2 variants
are defined -1 for E-LSPs and 1 for L-LSPs.

I have the following question: Why have L-LSPs been defined (instead of
defining just 1 type - E-LSPs)? According to my understanding all the
capabilities of an L-LSP can be obtained by using an E-LSP with the
proper PHB set.

Example: Assume that we want to establish an L-LSP for AF1 traffic. We
could achieve the same effect (an MPLS tunnel for Af1 traffic) by using
an E-LSP with 3 exp <--> PHB mappings:
** exp_af11 <--> AF11
** exp_af12 <--> AF12
** exp_af13 <--> AF13


Thanks for your answer.

Kind regards,

    Francis.