A Non-Queue-Building Per-Hop Behavior (NQB PHB) for Differentiated Services

The information below is for an old version of the document
Document Type Expired Internet-Draft (tsvwg WG)
Authors Greg White  , Thomas Fossati 
Last updated 2020-09-10 (latest revision 2020-03-09)
Replaces draft-white-tsvwg-nqb
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state WG Document (wg milestone: Feb 2021 - Submit "A Non-Queue-... )
Document shepherd David Black
IESG IESG state Expired
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Telechat date
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Send notices to David Black <david.black@dell.com>

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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.


Greg White (g.white@cablelabs.com)
Thomas Fossati (thomas.fossati@arm.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)