IPv6 Destination Option for Congestion Exposure (ConEx)
RFC 7837

Document Type RFC - Experimental (May 2016; No errata)
Last updated 2016-05-13
Stream IETF
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Stream WG state Submitted to IESG for Publication
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IESG IESG state RFC 7837 (Experimental)
Consensus Boilerplate Yes
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Responsible AD Martin Stiemerling
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                       S. Krishnan
Request for Comments: 7837                                      Ericsson
Category: Experimental                                     M. Kuehlewind
ISSN: 2070-1721                                               ETH Zurich
                                                              B. Briscoe
                                              Simula Research Laboratory
                                                                C. Ralli
                                                              Telefonica
                                                                May 2016

        IPv6 Destination Option for Congestion Exposure (ConEx)

Abstract

   Congestion Exposure (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 document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  This document is a product of the Internet Engineering
   Task Force (IETF).  It represents the consensus of the IETF
   community.  It has received public review and has been approved for
   publication by the Internet Engineering Steering Group (IESG).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7837.

Krishnan, et al.              Experimental                      [Page 1]
RFC 7837                ConEx Destination Option                May 2016

Copyright Notice

   Copyright (c) 2016 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
   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.  Requirements for the Coding of ConEx in IPv6  . . . . . . . .   4
   4.  ConEx Destination Option (CDO)  . . . . . . . . . . . . . . .   5
   5.  Implementation in the Fast Path of ConEx-Aware Routers  . . .   8
   6.  Tunnel Processing . . . . . . . . . . . . . . . . . . . . . .   8
   7.  Compatibility with Use of IPsec . . . . . . . . . . . . . . .   9
   8.  Mitigating Flooding Attacks by Using Preferential Drop  . . .   9
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     11.2.  Informative References . . . . . . . . . . . . . . . . .  12
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

Krishnan, et al.              Experimental                      [Page 2]
RFC 7837                ConEx Destination Option                May 2016

1.  Introduction

   Congestion Exposure (ConEx) [RFC7713] 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.

   This document specifies the ConEx wire protocol in IPv6.  The ConEx
   information can be used by any network element on the path to, for
   example, do traffic management or egress policing.  Additionally,
   this information will potentially be used by an audit function that
   checks the integrity of the sender's signaling.  Further, each
   transport protocol that supports ConEx signaling will need to
   precisely specify when the transport sets ConEx markings (e.g., the
   behavior for TCP is specified in [RFC7786]).
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