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Status:

EXPERIMENTAL

Authors:

K. De Schepper
B. Briscoe, Ed.
G. White

Stream:

IETF

Source:

tsvwg (wit)

Cite this RFC:TXT  | XML  |  BibTeX

DOI:  https://doi.org/10.17487/RFC9332

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Abstract

This specification defines a framework for coupling the Active QueueManagement (AQM) algorithms in two queues intended for flows withdifferent responses to congestion. This provides a way for theInternet to transition from the scaling problems of standardTCP-Reno-friendly ('Classic') congestion controls to the family of'Scalable' congestion controls. These are designed for consistentlyvery low queuing latency, very low congestion loss, and scaling ofper-flow throughput by using Explicit Congestion Notification (ECN)in a modified way. Until the Coupled Dual Queue (DualQ), theseScalable L4S congestion controls could only be deployed where aclean-slate environment could be arranged, such as in private datacentres.

This specification first explains how a Coupled DualQ works. It thengives the normative requirements that are necessary for it to workwell. All this is independent of which two AQMs are used, butpseudocode examples of specific AQMs are given in appendices.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.