What To Do With Multiple Active Paths in QUIC
draft-dawkins-quic-what-to-do-with-multipath-02

Document Type Active Internet-Draft (individual)
Author Spencer Dawkins 
Last updated 2020-11-20
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QUIC Working Group                                       S. Dawkins, Ed.
Internet-Draft                                           Tencent America
Intended status: Informational                         November 20, 2020
Expires: May 24, 2021

             What To Do With Multiple Active Paths in QUIC
            draft-dawkins-quic-what-to-do-with-multipath-02

Abstract

   The IETF QUIC working group has been chartered to produce extensions
   that would "enable ... multipath capabilities" since the working
   group was formed in 2016, but because multipath was an extension,
   work on multipath, and the other extensions named in the charter,
   waited while work proceeded on the core QUIC protocol specifications.

   After the QUIC working group chairs requested publication for the
   core QUIC protocol specifications, they scheduled a virtual interim
   meeting to understand the use cases that various groups inside and
   outside the IETF were envisioning for multipath with QUIC.

   As part of that discussion, it became obvious that people had a
   variety of ideas about how multiple paths would be used, because they
   weren't looking at the same use cases.

   This document is intended to capture that variety of ideas, to inform
   further discussion in the working group.

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 24, 2021.

Dawkins                   Expires May 24, 2021                  [Page 1]
Internet-Draft       What To Do With QUIC Multipath        November 2020

Copyright Notice

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Other Voices  . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Notes for Readers . . . . . . . . . . . . . . . . . . . .   4
     1.3.  Contribution and Discussion Venues for this draft.  . . .   4
   2.  Multipath Modes of Operation  . . . . . . . . . . . . . . . .   4
     2.1.  Reference Architecture  . . . . . . . . . . . . . . . . .   4
     2.2.  Sending When Multiple Paths Are Available . . . . . . . .   6
       2.2.1.  Traffic Steering  . . . . . . . . . . . . . . . . . .   6
       2.2.2.  Traffic Switching . . . . . . . . . . . . . . . . . .   6
       2.2.3.  Traffic Splitting . . . . . . . . . . . . . . . . . .   7
       2.2.4.  Traffic Steering, Traffic Switching, and Traffic
               Splitting in the Core QUIC Transport Protocol and
               Datagram Extension  . . . . . . . . . . . . . . . . .   7
     2.3.  Sending Strategies with Multiple Paths  . . . . . . . . .   8
       2.3.1.  Active-Standby  . . . . . . . . . . . . . . . . . . .   8
       2.3.2.  Trading Latency Versus Bandwidth  . . . . . . . . . .   8
       2.3.3.  Bandwidth Aggregation/Load Balancing  . . . . . . . .   8
       2.3.4.  Round-Trip-Time Thresholds, Minimum RTT Difference,
               and RTT Equivalence . . . . . . . . . . . . . . . . .   9
       2.3.5.  Priority-based  . . . . . . . . . . . . . . . . . . .   9
       2.3.6.  Redundant . . . . . . . . . . . . . . . . . . . . . .   9
       2.3.7.  Combinations of Strategies  . . . . . . . . . . . . .  10
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Document History  . . . . . . . . . . . . . . . . . . . . . .  11
   7.  Informative References  . . . . . . . . . . . . . . . . . . .  11
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  13

Dawkins                   Expires May 24, 2021                  [Page 2]
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