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question on e-lsp and l-lsp

  • From: David Charlap <David.Charlap@marconi.com>
  • Date: Thu, 01 Nov 2001 14:12:29 -0500

"Fan, Zhong" wrote:
> 
> Can anybody shed some light on the differences between e-lsp and
> l-lsp please? I'm reading draft-ietf-mpls-diff-ext-09.txt at the
> moment. Although the draft gives denifition of these two kinds of
> LSPs, I am still confused. Is this all about the mapping of diffserv
> classes to MPLS FEC or EXP?

The draft explains the differences.

In superbrief summary;

- An L-LSP has one QoS for all packets.  It is determined at LSP
  setup.  This is similar to setting up an LSP without any DiffServ
  extensions, except that the objects used in the signaling are
  different.

- An E-LSP has up to 8 QoS levels for the single LSP.  The EXP bits
  determine the appropriate QoS on a per-packet basis.  The QoS that
  is assigned to each EXP value is signaled at LSP setup (or is a
  configured default if the values are not signaled.)

-- David