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Status:

EXPERIMENTAL

Authors:

N. Khademi
M. Welzl
G. Armitage
G. Fairhurst

Stream:

IETF

Source:

tcpm (wit)

Cite this RFC:TXT  | XML  |  BibTeX

DOI:  https://doi.org/10.17487/RFC8511

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Abstract

Active Queue Management (AQM) mechanisms allow for burst tolerancewhile enforcing short queues to minimise the time that packets spendenqueued at a bottleneck. This can cause noticeable performancedegradation for TCP connections traversing such a bottleneck,especially if there are only a few flows or their bandwidth-delayproduct (BDP) is large. The reception of a Congestion Experienced(CE) Explicit Congestion Notification (ECN) mark indicates that anAQM mechanism is used at the bottleneck, and the bottleneck networkqueue is therefore likely to be short. Feedback of this signalallows the TCP sender-side ECN reaction in congestion avoidance toreduce the Congestion Window (cwnd) by a smaller amount than thecongestion control algorithm's reaction to inferred packet loss.Therefore, this specification defines an experimental change to theTCP reaction specified in RFC 3168, as permitted by RFC 8311.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.