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Versions: (draft-krishnan-conex-destopt) 00 01 02 03 04 05 06 07 08 09 10 11 12 RFC 7837

conex Working Group                                          S. Krishnan
Internet-Draft                                                  Ericsson
Intended status: Standards Track                           M. Kuehlewind
Expires: April 26, 2012                      IKR University of Stuttgart
                                                               C. Ucendo
                                                              Telefonica
                                                        October 24, 2011


                   IPv6 Destination Option for Conex
                      draft-ietf-conex-destopt-00

Abstract

   Conex is a mechanism by which senders inform the network about the
   congestion encountered by packets earlier in the same flow.  This
   document specifies an IPv6 destination option that is capable of
   carrying conex markings in IPv6 datagrams.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 26, 2012.

Copyright Notice

   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of



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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Conventions used in this document . . . . . . . . . . . . . . . 3
   3.  Background  . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   4.  Conex Destination Option (CDO)  . . . . . . . . . . . . . . . . 4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   8.  Normative References  . . . . . . . . . . . . . . . . . . . . . 5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 5




































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1.  Introduction

   Conex [CAM] is a mechanism by which senders inform the network about
   the congestion encountered by packets earlier in the same flow.  This
   document specifies an IPv6 destination option [RFC2460] that can be
   used for performing conex markings in IPv6 datagrams.


2.  Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL","SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].


3.  Background

   The Conex working group came up with a list of requirements that had
   to be met by any marking mechanism.  It then considered several
   alternative mechanisms and evaluated their suitability for conex
   marking.  There were no mechanisms found that were completely
   suitable, but the only mechanism that came close to meeting the
   requirements was IPv6 destination options.  The analysis of the
   different alternatives can be found in [draft-krishnan-conex-ipv6].



























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4.  Conex Destination Option (CDO)

   The Conex Destination Option (CDO) is a destination option that can
   be included in IPv6 datagrams that are sent by conex-aware senders in
   order to inform conex-aware nodes on the path about the CDO has an
   alignment requirement of (none).

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
                                   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
                                   |  Option Type  | Option Length |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |X|L|E|C|                       Reserved                        |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                 Figure 1: Conex Destination Option Layout


   Option Type

      8-bit identifier of the type of option. The option identifier
      for the conex destination option will be allocated by the IANA.

   Option Length

      8-bit unsigned integer.  The length of the option (excluding
      the Option Type and Option Length fields). This field MUST be
      set to the value 4.

   X Bit
      When this bit is set, the transport sender is using ConEx with
      this packet. If it is reset, the sender is not using ConEx.

   L Bit

      When this bit is set, the transport sender has experienced a loss.
      If it is reset, the sender has not experienced a loss.

   E Bit

      When this bit is set, the transport sender has experienced
      ECN-signaled congestion. If it is reset, the sender has not
      experienced ECN-signaled congestion.

   C Bit

      When this bit is set, the transport sender is building up
      congestion credit. Otherwise it is not.



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5.  Acknowledgements

   The authors would like to thank Marcelo Bagnulo, Bob Briscoe, Ingemar
   Johansson, Joel Halpern and John Leslie for the discussions that led
   to this document.


6.  Security Considerations

   This document does not bring up any new security issues.


7.  IANA Considerations

   This document defines a new IPv6 destination option for carrying
   conex markings.  IANA is requested to assign a new destination option
   type in the Destination Options registry maintained at
   http://www.iana.org/assignments/ipv6-parameters <TBA1> Conex
   Destination Option [RFCXXXX] The act bits for this option need to be
   10 and the chg bit needs to be 0.


8.  Normative References

   [CAM]      Briscoe, B., "Congestion Exposure (ConEx) Concepts and
              Abstract Mechanism", draft-ietf-conex-abstract-mech-01
              (work in progress), March 2011.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2460]  Deering, S. and R. Hinden, "Internet Protocol, Version 6
              (IPv6) Specification", RFC 2460, December 1998.


Authors' Addresses

   Suresh Krishnan
   Ericsson
   8400 Blvd Decarie
   Town of Mount Royal, Quebec
   Canada

   Email: suresh.krishnan@ericsson.com







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   Mirja Kuehlewind
   IKR University of Stuttgart

   Email: mirja.kuehlewind@ikr.uni-stuttgart.de


   Carlos Ralli Ucendo
   Telefonica

   Email: ralli@tid.es









































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