Guidelines for Internet Congestion Control at Endpoints
draft-fairhurst-tsvwg-cc-05

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Author Gorry Fairhurst 
Last updated 2020-11-17
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Internet Engineering Task Force                             G. Fairhurst
Internet-Draft                                    University of Aberdeen
Intended status: Standards Track                       November 17, 2020
Expires: May 21, 2021

        Guidelines for Internet Congestion Control at Endpoints
                      draft-fairhurst-tsvwg-cc-05

Abstract

   This document is for discussion by the TSVWG.  It provides guidance
   on the design of methods to avoid congestion collapse and to provide
   congestion control.  Recommendations and requirements on this topic
   are distributed across many documents in the RFC series.  This
   therefore seeks to gather and consolidate these recommendations in an
   annexe.  Based on these specifications, and Internet engineering
   experience, the document provides input to the design of new
   congestion control methods in protocols.

   The present document is for discussion and comment by the IETF.  If
   published, it plans to update or replace the Best Current Practice in
   BCP 41, which currently includes "Congestion Control Principles"
   provided in RFC2914.

Status of This Memo

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

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   This Internet-Draft will expire on May 21, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Fairhurst                 Expires May 21, 2021                  [Page 1]
Internet-Draft                CC Guidelines                November 2020

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Principles of Congestion Control  . . . . . . . . . . . . . .   4
     3.1.  Internet Requirements . . . . . . . . . . . . . . . . . .   4
       3.1.1.  Tolerence to a Diversity of Path Characteristics  . .   5
     3.2.  Avoiding Congestion Collapse and Flow Starvation  . . . .   5
     3.3.  Connection Initialization . . . . . . . . . . . . . . . .   6
     3.4.  Using Path Capacity . . . . . . . . . . . . . . . . . . .   7
     3.5.  Timers and Retransmission . . . . . . . . . . . . . . . .   8
     3.6.  Responding to Potential Congestion  . . . . . . . . . . .  10
     3.7.  Using More Capacity . . . . . . . . . . . . . . . . . . .  11
     3.8.  Network Signals . . . . . . . . . . . . . . . . . . . . .  12
     3.9.  Protection of Protocol Mechanisms . . . . . . . . . . . .  12
   4.  IETF Guidelines on Evaluation of Congestion Control . . . . .  13
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Appendix A.  Internet Congestion Control  . . . . . . . . . . . .  19
     A.1.  Flow Multiplexing and Congestion  . . . . . . . . . . . .  20
     A.2.  Avoiding Congestion Collapse and Flow Starvation  . . . .  22
     A.3.  Adjusting the Rate  . . . . . . . . . . . . . . . . . . .  22
   Appendix B.  Best Current Practice in the RFC-Series  . . . . . .  23
   Appendix C.  Revision Notes . . . . . . . . . . . . . . . . . . .  25
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  26

1.  Introduction

   The IETF has specified Internet transports (e.g., TCP
   [I-D.ietf-tcpm-rfc793bis], UDP [RFC0768], UDP-Lite [RFC3828], SCTP
   [RFC4960], and DCCP [RFC4340]) as well as protocols layered on top of
   these transports (e.g., RTP [RFC3550], QUIC
   [I-D.ietf-quic-transport], SCTP/UDP [RFC6951], DCCP/UDP [RFC6773])
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