[PCN] New Version: draft-ietf-pcn-3-in-1-encoding-11.txt

Bob Briscoe <bob.briscoe@bt.com> Fri, 20 April 2012 11:30 UTC

Message-ID: <201204201130.q3KBUIDt029368@bagheera.jungle.bt.co.uk>
Date: Fri, 20 Apr 2012 12:30:17 +0100
To: Martin Stiemerling <martin.stiemerling@neclab.eu>
From: Bob Briscoe <bob.briscoe@bt.com>
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Cc: PCN IETF list <pcn@ietf.org>, pcn-chairs@tools.ietf.org, draft-ietf-pcn-3-in-1-encoding@tools.ietf.org
Subject: [PCN] New Version: draft-ietf-pcn-3-in-1-encoding-11.txt
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Martin,

We've posted the changes the WG wanted, and those requested during 
IESG review. So this should be ready to go forward again at the next 
IESG call.

Changes from draft-ietf-pcn-3-in-1-encoding-10 to -11:

       *  Pointed out that any DSCP re-mapping must precede PCN-ingress
          processing;

       *  Ingress behaviour for ECN-capable PCN-packets: allowed any PCN-
          capable encapsulation, not just IP-in-IP tunnelling.  Added
          cautionary note about MPLS PHP;

       *  PCN-policing at ingress:

          +  Clarified what per-flow policing entails;

          +  Clarified that a DSCP of zero is '000000';

          +  For policed packets, added SHOULD log, MAY alarm;

       *  Updated refs and acks.


Regards


Bob & co-authors

>Resent-Date: Fri, 20 Apr 2012 12:21:05 +0100
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>To: <bob.briscoe@bt.com>
>CC: <menth@informatik.uni-tuebingen.de>, <toby@moncaster.com>
>Subject: New Version Notification for draft-ietf-pcn-3-in-1-encoding-11.txt
>
>A new version of I-D, draft-ietf-pcn-3-in-1-encoding-11.txt has been 
>successfully submitted by Bob Briscoe and posted to the IETF repository.
>
>Filename:       draft-ietf-pcn-3-in-1-encoding
>Revision:       11
>Title:          Encoding 3 PCN-States in the IP header using a single DSCP
>Creation date:  2012-04-17
>WG ID:          pcn
>Number of pages: 28
>
>Abstract:
>    The objective of Pre-Congestion Notification (PCN) is to protect the
>    quality of service (QoS) of inelastic flows within a Diffserv domain.
>    The overall rate of the PCN-traffic is metered on every link in the
>    PCN domain, and PCN-packets are appropriately marked when certain
>    configured rates are exceeded.  Egress nodes pass information about
>    these PCN-marks to decision points which then decide whether to admit
>    or block new flow requests or to terminate some already-admitted
>    flows during serious pre-congestion.
>
>    This document specifies how PCN-marks are to be encoded into the IP
>    header by re-using the Explicit Congestion Notification (ECN)
>    codepoints within a PCN-domain.  The PCN wire protocol for non-IP
>    protocol headers will need to be defined elsewhere.  Nonetheless,
>    this document clarifies the PCN encoding for MPLS in an informational
>    Appendix.  The encoding for IP provides for up to three different PCN
>    marking states using a single DSCP: Not-marked (NM), Threshold-marked
>    (ThM) and Excess-traffic-marked (ETM).  Hence, it is called the
>    3-in-1 PCN encoding.  This document obsoletes RFC5696.
>
> 
>
>
>
>The IETF Secretariat

________________________________________________________________
Bob Briscoe,                                BT Innovate & Design

[PCN] New Version: draft-ietf-pcn-3-in-1-encoding… Bob Briscoe
Re: [PCN] New Version: draft-ietf-pcn-3-in-1-enco… Martin Stiemerling