Subject: Re: [CCAMP] FW: New Version Notification for draft-balls-ccamp-relax-loop-check-02.txt

From: Steve Balls <[email-masked]>
Date: Wed, 23 Jan 2013 17:37:02 +0000

Hi CCAMP,

We would like to progress this draft, but need support from the list that it is valid.  

To summarize, RSVP currently prevents an LSP from passing through the same control plane node more than once.  This draft relaxes the current strict RSVP loop checking rules to allow an LSP "spiral" - one that passes through a control plane node more than once, but is still following a different path (input <interface, label> to output <interface, label>).

The draft presents several use cases where spiral paths provide important behaviour.
 - WDM networks with restricted wavelength conversions
 - Networks where nodes have restricted connectivity
 - WDM networks where nodes have restricted wavelength switching capabilities
 - Distributed networks where one control plane instance is controlling multiple data plane nodes
 - Ingress protection.

We therefore believe this draft addresses genuine problems which are not currently solved by standard RSVP.  As such we would like to request the CCAMP group consider this draft for WG adoption.  Please let us know if you agree.

Thanks,

Steve, Jon and Cyril.
(Authors)

-----Original Message-----
From: [email-masked] [mailto:[email-masked]] On Behalf Of Steve Balls
Sent: 20 November 2012 15:06
To: [email-masked]
Subject: [CCAMP] FW: New Version Notification for draft-balls-ccamp-relax-loop-check-02.txt

Hi CCAMP,

We have updated draft-balls-ccamp-relax-loop-check with some further examples demonstrating why we believe an update to RSVP is required, and modified the language to clarify the proposed solution does not introduce loops.

We would like to discuss this on the list.  Specifically, do you agree that the use cases described in the draft are valid and that modifications to RSVP are required to support them?

Thanks,

Steve, Jon and Cyril.
(Authors)

-----Original Message-----
From: [email-masked] [mailto:[email-masked]] 
Sent: Monday, November 19, 2012 10:02 AM
To: Steve Balls
Cc: Jonathan Hardwick; NSN - Cyril Margaria
Subject: New Version Notification for draft-balls-ccamp-relax-loop-check-02.txt

A new version of I-D, draft-balls-ccamp-relax-loop-check-02.txt
has been successfully submitted by Steve Balls and posted to the IETF repository.

Filename:	 draft-balls-ccamp-relax-loop-check
Revision:	 02
Title:		 Relaxing RSVP Loop Checking
Creation date:	 2012-11-19
WG ID:		 Individual Submission
Number of pages: 10
URL:             http://www.ietf.org/internet-drafts/draft-balls-ccamp-relax-loop-check-02.txt
Status:          http://datatracker.ietf.org/doc/draft-balls-ccamp-relax-loop-check
Htmlized:        http://tools.ietf.org/html/draft-balls-ccamp-relax-loop-check-02
Diff:            http://www.ietf.org/rfcdiff?url2=draft-balls-ccamp-relax-loop-check-02

Abstract:
   This specification relaxes the rules governing loop checking within
   RSVP.  These were originally defined in RFC3209 and are too strict
   for the requirements of today's data planes.

The IETF Secretariat

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