RFC 8511

TCP Alternative Backoff with ECN (ABE), December 2018

Canonical URL:
https://www.rfc-editor.org/rfc/rfc8511.txt
File formats:
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Status:
EXPERIMENTAL
Authors:
N. Khademi
M. Welzl
G. Armitage
G. Fairhurst
Stream:
IETF
Source:
tcpm (tsv)

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC8511

Discuss this RFC: Send questions or comments to tcpm@ietf.org

Other actions: Submit Errata  |  Find IPR Disclosures from the IETF


Abstract

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


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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