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Confusion on spec in MPLS support of Diff-Serv

  • From: "Thomas Huang" <thuang@polarisnetworks.com>
  • Date: Wed, 20 Sep 2000 10:35:33 -0700
  • Importance: Normal
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Hello:

I am not clear if the handling of RVSP path message w/o diffserv object in
the draft is workable (section 5.3 : handling diffserv object - by Le
Faucheur)

In Section 5.3, it says when a LSR receives a PATH message without DIFFSERV
OBJECT, it should interpret this a a request for an E-LSP using the
preconfigured EXP-PHB mapping.
But then it adds that for compatibility, an overwrite option can be
activated for LSRs that don't support diff-serv.

It appears to me that these two things are conflicting because a LSR may
support both diff-serv and non-diff-serv, i.e. how does a LSR know a RSVP
path msg without diffserv object should use preconfigured exp-phb or just
behave as a non-diff-serv aware LSR.

Thanks for any clarification and help.

Thomas