A Non-Queue-Building Per-Hop Behavior (NQB PHB) for Differentiated Services
draft-ietf-tsvwg-nqb-02

Document Type Active Internet-Draft (tsvwg WG)
Authors Greg White  , Thomas Fossati 
Last updated 2020-09-22
Replaces draft-white-tsvwg-nqb
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Transport Area Working Group                                    G. White
Internet-Draft                                                 CableLabs
Intended status: Standards Track                              T. Fossati
Expires: March 26, 2021                                              ARM
                                                      September 22, 2020

   A Non-Queue-Building Per-Hop Behavior (NQB PHB) for Differentiated
                                Services
                        draft-ietf-tsvwg-nqb-02

Abstract

   This document specifies properties and characteristics of a Non-
   Queue-Building Per-Hop Behavior (NQB PHB).  The purpose of this NQB
   PHB is to provide a separate queue that enables low latency and, when
   possible, low loss for application-limited traffic flows that would
   ordinarily share a queue with capacity-seeking traffic.  This PHB is
   implemented without prioritization and without rate policing, making
   it suitable for environments where the use of either these features
   may be restricted.  The NQB PHB has been developed primarily for use
   by access network segments, where queuing delays and queuing loss
   caused by Queue-Building protocols are manifested, but its use is not
   limited to such segments.  In particular, applications to cable
   broadband links and mobile network radio and core segments are
   discussed.  This document defines a standard Differentiated Services
   Code Point (DSCP) to identify Non-Queue-Building flows.

Status of This Memo

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   This Internet-Draft will expire on March 26, 2021.

White & Fossati          Expires March 26, 2021                 [Page 1]
Internet-Draft           Non-Queue-Building PHB           September 2020

Copyright Notice

   Copyright (c) 2020 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Overview: Non-Queue-Building Flows  . . . . . . . . . . . . .   3
   4.  DSCP Marking of NQB Traffic . . . . . . . . . . . . . . . . .   4
     4.1.  End-to-end usage and DSCP Re-marking  . . . . . . . . . .   5
   5.  Non-Queue-Building PHB Requirements . . . . . . . . . . . . .   6
   6.  Impact on Higher Layer Protocols  . . . . . . . . . . . . . .   7
   7.  Relationship to L4S . . . . . . . . . . . . . . . . . . . . .   7
   8.  Configuration and Management  . . . . . . . . . . . . . . . .   8
   9.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  DOCSIS Access Networks  . . . . . . . . . . . . . . . . .   8
     9.2.  Mobile Networks . . . . . . . . . . . . . . . . . . . . .   8
     9.3.  WiFi Networks . . . . . . . . . . . . . . . . . . . . . .   9
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   12. Security Considerations . . . . . . . . . . . . . . . . . . .  10
   13. Informative References  . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   This document defines a Differentiated Services (DS) per-hop behavior
   (PHB) called "Non-Queue-Building Per-Hop Behavior" (NQB PHB), which
   is intended to enable networks to provide low latency and low loss
   for traffic flows that are relatively low data rate and that do not
   themselves materially contribute to queueing delay and loss.  Such
   Non-Queue-Building flows (for example: interactive voice and video,
   gaming, machine to machine applications) are application limited
   flows that are distinguished from traffic flows managed by an end-to-
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