A Non-Queue-Building Per-Hop Behavior (NQB PHB) for Differentiated Services
draft-ietf-tsvwg-nqb-03
Transport Area Working Group G. White
Internet-Draft CableLabs
Intended status: Standards Track T. Fossati
Expires: May 6, 2021 ARM
November 2, 2020
A Non-Queue-Building Per-Hop Behavior (NQB PHB) for Differentiated
Services
draft-ietf-tsvwg-nqb-03
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 May 6, 2021.
White & Fossati Expires May 6, 2021 [Page 1]
Internet-Draft Non-Queue-Building PHB November 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 3
3. Overview: Non-Queue-Building Flows . . . . . . . . . . . . . 3
4. The NQB PHB and its Relationship to the DiffServ Architecture 4
5. DSCP Marking of NQB Traffic . . . . . . . . . . . . . . . . . 5
5.1. End-to-end usage and DSCP Re-marking . . . . . . . . . . 6
5.2. Aggregation of the NQB PHB with other DiffServ PHBs . . . 7
6. Non-Queue-Building PHB Requirements . . . . . . . . . . . . . 8
7. Impact on Higher Layer Protocols . . . . . . . . . . . . . . 9
8. The NQB PHB and Tunnels . . . . . . . . . . . . . . . . . . . 10
9. Relationship to L4S . . . . . . . . . . . . . . . . . . . . . 10
10. Configuration and Management . . . . . . . . . . . . . . . . 10
11. Example Use Cases . . . . . . . . . . . . . . . . . . . . . . 10
11.1. DOCSIS Access Networks . . . . . . . . . . . . . . . . . 10
11.2. Mobile Networks . . . . . . . . . . . . . . . . . . . . 11
11.3. WiFi Networks . . . . . . . . . . . . . . . . . . . . . 11
12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13
13. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
14. Security Considerations . . . . . . . . . . . . . . . . . . . 13
15. Informative References . . . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
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
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