TCP Alternative Backoff with ECN (ABE)
draft-ietf-tcpm-alternativebackoff-ecn-04

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Last updated 2017-11-15
Replaces draft-khademi-tcpm-alternativebackoff-ecn
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Network Working Group                                         N. Khademi
Internet-Draft                                                  M. Welzl
Intended status: Experimental                         University of Oslo
Expires: May 19, 2018                                        G. Armitage
                                      Swinburne University of Technology
                                                            G. Fairhurst
                                                  University of Aberdeen
                                                       November 15, 2017

                 TCP Alternative Backoff with ECN (ABE)
               draft-ietf-tcpm-alternativebackoff-ecn-04

Abstract

   Recent Active Queue Management (AQM) mechanisms allow for burst
   tolerance while enforcing short queues to minimise the time that
   packets spend enqueued at a bottleneck.  This can cause noticeable
   performance degradation for TCP connections traversing such a
   bottleneck, especially if they are only a few or their bandwidth-
   delay-product is large.  An Explicit Congestion Notification (ECN)
   signal indicates that an AQM mechanism is used at the bottleneck, and
   therefore the bottleneck network queue is likely to be short.  This
   document therefore proposes an update to the TCP sender-side ECN
   reaction in congestion avoidance to reduce the Congestion Window
   (cwnd) by a smaller amount than the congestion control algorithm's
   reaction to inferred packet loss.

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
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   This Internet-Draft will expire on May 19, 2018.

Khademi, et al.           Expires May 19, 2018                  [Page 1]
Internet-Draft                     ABE                     November 2017

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Table of Contents

   1.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Specification . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Why Use ECN to Vary the Degree of Backoff?  . . . . . . .   4
     4.2.  Focus on ECN as Defined in RFC3168  . . . . . . . . . . .   5
     4.3.  Choice of ABE Multiplier  . . . . . . . . . . . . . . . .   5
   5.  ABE Requirements  . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   8.  Implementation Status . . . . . . . . . . . . . . . . . . . .   8
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   10. Revision Information  . . . . . . . . . . . . . . . . . . . .   9
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     11.2.  Informative References . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Definitions

   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 RFC 2119 [RFC2119].

2.  Introduction

   Explicit Congestion Notification (ECN) [RFC3168] makes it possible
   for an Active Queue Management (AQM) mechanism to signal the presence
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