TCP Alternative Backoff with ECN (ABE)
draft-khademi-alternativebackoff-ecn-02

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Document Type Active Internet-Draft (individual)
Last updated 2015-12-21
Replaced by draft-khademi-tsvwg-ecn-response, draft-khademi-tcpm-alternativebackoff-ecn
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Network Working Group                                         N. Khademi
Internet-Draft                                                  M. Welzl
Updates: 3168 (if approved)                           University of Oslo
Intended status: Experimental                                G. Armitage
Expires: June 23, 2016                           Swinburne University of
                                                              Technology
                                                            G. Fairhurst
                                                  University of Aberdeen
                                                       December 21, 2015

                 TCP Alternative Backoff with ECN (ABE)
                draft-khademi-alternativebackoff-ecn-02

Abstract

   This memo provides an experimental update to RFC3168.  It updates the
   TCP sender-side reaction to a congestion notification received via
   Explicit Congestion Notification (ECN).  The updated method reduces
   cwnd by a smaller amount than TCP does in reaction to loss.  The
   intention is to achieve good throughput when the queue at the
   bottleneck is smaller than the bandwidth-delay-product of the
   connection.  This is more likely when an Active Queue Management
   (AQM) mechanism has used ECN to CE-mark a packet, than when a packet
   was lost.  Future versions of this document will discuss SCTP as well
   as other transports using ECN.

Status of this Memo

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   This Internet-Draft will expire on June 23, 2016.

Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Khademi, et al.           Expires June 23, 2016                 [Page 1]
Internet-Draft                     ABE                     December 2015

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Discussion . . . . . . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  Why use ECN to vary the degree of backoff? . . . . . . . .  4
     2.2.  Choice of ABE multiplier . . . . . . . . . . . . . . . . .  5
   3.  Updating the Sender-side ECN Reaction  . . . . . . . . . . . .  6
     3.1.  RFC 2119 . . . . . . . . . . . . . . . . . . . . . . . . .  6
     3.2.  Update to RFC 3168 . . . . . . . . . . . . . . . . . . . .  6
     3.3.  Status of the Update . . . . . . . . . . . . . . . . . . .  7
   4.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . .  7
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  7
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . .  8
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . .  8
     7.1.  Normative References . . . . . . . . . . . . . . . . . . .  8
     7.2.  Informative References . . . . . . . . . . . . . . . . . .  8
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10

Khademi, et al.           Expires June 23, 2016                 [Page 2]
Internet-Draft                     ABE                     December 2015

1.  Introduction

   Explicit Congestion Notification (ECN) is specified in [RFC3168].  It
   allows a network device that uses Active Queue Management (AQM) to
   set the congestion experienced, CE, codepoint in the ECN field of the
   IP packet header, rather than drop ECN-capable packets when incipient
   congestion is detected.  When an ECN-capable transport is used over a
   path that supports ECN, it provides the opportunity for flows to
   improve their performance in the presence of incipient congestion
   [I-D.AQM-ECN-benefits].

   [RFC3168] not only specifies the router use of the ECN field, it also
   specifies a TCP procedure for using ECN.  This states that a TCP
   sender should treat the ECN indication of congestion in the same way
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