Subject: RE: MPLS Support of E-LSPs

From: "Sudhakar Ganti" <[email-masked]>
Date: Tue, 1 May 2001 17:23:37 -0400

RE: MPLS Support of E-LSPsHi Dimitry,

Thanks for your comments on the draft. In general, the proposed extensions
are
useful when resource management decisions are to be made on the signaled
PSC.

The intention of this draft is to facilitate resource allocation at a finer
granularity
than class-type would allow, i.e, at the granularity of a OA. As such we
cannot
replace PSC with CT. However, it is not difficult to extend the E-LSP to
signal per-PSC or per-class-type resources.

Instead of replacing the PSC field completely with CT, one can include CT
and a couple
of bits indicating whether CT or PSC. This would enable signaling of
resources per PSC or per CT. Would this of interest to anyone?

The current L-LSP signaling is fine and does not need a separate L-LSP
object.

-Sudhakar
  -----Original Message-----
  From: Dimitry Haskin [mailto:[email-masked]]
  Sent: Monday, April 30, 2001 3:51 PM
  To: 'Sudhakar Ganti'; [email-masked]
  Cc: Nabil Seddigh; Biswajit Nandy
  Subject: RE: MPLS Support of E-LSPs

  Sudhakar,

  Thanks for the draft. The proposed extensions will provide a needed
signaling support for the Diff-Serv's Uniform Tunneling model described in
draft-ietf-mpls-diff-ext-09.txt.

  To make your proposal consistent with the Class-Type concept of
draft-ietf-mpls-diff-te-reqts-00.txt, I would suggest to replace the PSC
field of the proposed Traffic Profile with a 4-bit Class-Type (CT) field. In
addition if your allow the ELSP Object to carry resource requirements for
L-LSP also (you'd need to rename the object) there would be no need for the
CLASSTYPE Object defined in draft-ietf-mpls-diff-te-ext-01.txt.

  Dimitry

  -----Original Message-----
  From: Sudhakar Ganti [mailto:[email-masked]]
  Sent: Monday, April 30, 2001 12:39 PM
  To: [email-masked]
  Cc: Nabil Seddigh; Biswajit Nandy
  Subject: MPLS Support of E-LSPs

  Hello,

  The following draft is available in the IETF draft
  repository that extends E-LSP signaling:

  Title: MPLS Support of Differentiated Services using E-LSP
  Authors: S.Ganti, N.Seddigh, B.Nandy
  URL:
  http://www.ietf.org/internet-drafts/draft-ganti-mpls-diffserv-elsp-00.txt

  The current E-LSP approach allows multiple Ordered
  Aggregates  (OAs)  to  be carried  by  a  single
  LSP. The  existing  E-LSP specification only supports
  collective bandwidth signalling for all the OAs in
  an E-LSP. However, there exist uses of the E-LSP
  approach where it is desirable to support bandwidth
  signalling on a per-OA or per-PSC  basis.
  This draft extends the original E-LSP approach by
  defining extensions to support per-OA signalling.
  The extensions are proposed  for  both RSVP and CR-LDP.

  Please comment on the same. Thanks

  -Sudhakar
  ------------
  Dr. Sudhakar Ganti
  Technical Specialist
  Tropic Networks Inc,
  Kanata, Ontario, Canada