RE: new draft about signaling for a bidirectionl lightpath

["Diego Caviglia (GA/ERI)" <diego.caviglia@ericsson.com>]

Hi Hiroaki,
           Not clear to me why the mechanism using label set with the same lambda as the Upstream label is not enough here.   

BR

Diego



-----Original Message-----
From: owner-ccamp@ops.ietf.org [mailto:owner-ccamp@ops.ietf.org] On Behalf Of Hiroaki Harai
Sent: venerdì 6 luglio 2007 3.10
To: ccamp@ops.ietf.org
Subject: new draft about signaling for a bidirectionl lightpath

Hi everyone,

We posted a new draft about GMPLS signaling for a bidirectional
lightpath setup as follows.
http://www.ietf.org/internet-drafts/draft-xu-rsvpte-bidir-wave-00.txt

======
Title   : Extensions to GMPLS RSVP-TE for Bidirectional Lightpath with
          the Same Wavelength
Authors : S. Xu, H. Harai, and D. King
Filename: draft-xu-rsvpte-bidir-wave-00.txt
	
Abstract: For bidirectional lightpaths provisioning, in the case of
optical nodes that do not support wavelength conversion, it would be
necessary to use the same wavelength along the route on each
direction. In certain optical network scenarios, the use of the same
wavelength on both directions would be advantageous.  For instance,
some type of ROADMs may add/drop the same wavelength
simultaneously. In another case, the users' optical end nodes are
equipped with fixed-wavelength transponders.

This document describes extensions to RSVP-TE signaling for 
bidirectional wavelength lightpaths that require the same wavelength on 
both directions. By using an LSP_ATTRIBUTES object defined in [RFC4420], 
the extensions enable the new type lightpaths to support the low cost 
configuration at users' optical end nodes.
======

We believe that selecting a single wavelength on both directions for a
bidirectional LSP is very real. And our suggestion in this draft is a
simple one.

We appreciate your comments and feedbacks.

With best regards,
Hiroaki

-------
Hiroaki Harai, Ph.D. (http://nag.nict.go.jp/)
Network Architecture Group, New Generation Network Research Center
National Institute of Information and Communications Technology (NICT), JAPAN.
Email: harai@nict.go.jp;  Phone: +81-42-327-5418;  FAX: +81-42-327-6680