RE: I-D ACTION:draft-ash-multi-area-te-reqmts-01.txt

["Ash, Gerald R (Jerry), ALCTA" <gash@att.com>]

We would like to call for agreement that

a) draft-ietf-tewg-restore-hierarchy-00.txt calls for multi-area TE
requirements to be generated, but contains no such requirements (Section 3
says "requirements for multi-area traffic engineering need to be developed
to provide guidance for any necessary protocol extensions"), and
b) draft-ash-multi-area-te-reqmts-01.txt be adopted as a multi-area TE
requirements draft.

In addition, Section 6.3 of draft-ietf-tewg-restore-hierarchy-00.txt says
"To support edge-to-edge signaling in the above network scenarios within the
framework of existing horizontal hierarchies, current traffic engineering
(TE) methods [19, 5] may need to be extended. Requirements for multi-area TE
need to be developed to provide guidance for any necessary protocol
extensions."

In regard to 'necessary protocol extensions', there are numerous multi-area
TE approaches, so there is a need to converge on one or a subset of the
approaches (rather than support them all).
draft-ash-multi-area-te-rqmts-01.txt summarizes what protocol extensions
have been proposed by various multi-area TE drafts, including:
http://search.ietf.org/internet-drafts/draft-kompella-mpls-multiarea-te-02.t
xt
http://search.ietf.org/internet-drafts/draft-venkatachalam-interarea-mpls-te
-02.txt
http://search.ietf.org/internet-drafts/draft-vasseur-mpls-computation-rsvp-0
0.txt
http://www.ietf.org/internet-drafts/draft-lee-mpls-path-request-02.txt
http://www.ietf.org/internet-drafts/draft-iwata-mpls-crankback-02.txt.

draft-ash-multi-area-te-rqmts-01.txt also compares the
advantages/disadvantages of each proposed multi-area TE method, and how well
the method meets the proposed requirements.  The analysis can be used to
focus discussion and to select among the approaches.

In summary, we would like to hear any objections to adopting
draft-ash-multi-area-te-rqmts-01.txt as a multi-area TE requirements draft.

Thanks,
Jerry Ash


-----Original Message-----
From: Internet-Drafts@ietf.org [mailto:Internet-Drafts@ietf.org]
Sent: Friday, November 30, 2001 6:00 AM
To: IETF-Announce; @wsscan.att.com
Subject: I-D ACTION:draft-ash-multi-area-te-reqmts-01.txt

A New Internet-Draft is available from the on-line Internet-Drafts
directories.

	Title		: Requirements for Multi-Area TE
	Author(s)	: J. Ash et al.
	Filename	: draft-ash-multi-area-te-reqmts-01.txt
	Pages		: 16
	Date		: 29-Nov-01
	
This draft describes requirements for multi-area TE within the context of
GMPLS.  Based on the requirements, the goal is to eventually provide
protocol extensions needed for multi-area TE.  Various approaches to
multi-area TE are considered, and these approaches are evaluated against the
requirements.  These approaches include state dependent routing (SDR) LSP
selection, event dependent routing (EDR) LSP selection, and time dependent
routing (TDR) LSP selection.  These approaches include needs to support
path-computation server (PCS) functionality, query functionality, crankback
functionality, TE feedback functionality, and summary-LSA functionality. The
target in future releases of this document will be to converge on a reduced
subset of the required multi-area TE methods and protocol
extensions.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ash-multi-area-te-reqmts-01.txt