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RFC 9956
Title: A Non-Queue-Building Per-Hop Behavior (NQB PHB)
for Differentiated Services
Author: G. White,
T. Fossati,
R. Geib
Status: Standards Track
Stream: IETF
Date: May 2026
Mailbox: [email protected],
[email protected],
[email protected]
Pages: 32
Updates: RFC 8325
I-D Tag: draft-ietf-tsvwg-nqb-33.txt
URL: https://www.rfc-editor.org/info/rfc9956
DOI: 10.17487/RFC9956
This document specifies characteristics of a Non-Queue-Building
Per-Hop Behavior (NQB PHB). The NQB PHB provides a shallow-buffered,
best-effort service as a complement to a Default deep-buffered,
best-effort service for Internet services. The purpose of this NQB
PHB is to provide a separate queue that enables smooth (i.e.,
non-bursty), low-data-rate, application-limited traffic microflows,
to avoid the delay, delay variation and loss that would ordinarily be
caused by sharing a queue with bursty, capacity-seeking traffic.
This PHB is implemented without prioritization and can be implemented
without rate policing, making it suitable for environments where the
use of these features is restricted. The NQB PHB has been developed
primarily for use by access network segments, where queuing delay and
queuing loss caused by Queue-Building (QB) protocols are manifested;
however, its use is not limited to such segments. In particular, the
application of NQB PHB to cable broadband links, Wi-Fi links, and
mobile network radio/core segments are discussed in this document.
This document recommends a specific Differentiated Services Code
Point (DSCP) to identify NQB microflows and updates the guidance in
RFC 8325 on mapping Differentiated Services (Diffserv or DS) to IEEE
802.11 for this codepoint.
This document is a product of the Transport and Services Working Group Working
Group of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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