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BCP 41

RFC 7141

"Byte and Packet Congestion Notification", February 2014

Canonical URL:
http://www.rfc-editor.org/rfc/rfc7141.txt
This document is also available in this non-normative format: PDF.
Status:
BEST CURRENT PRACTICE
Updates:
RFC 2309, RFC 2914
Authors:
B. Briscoe
J. Manner
Stream:
IETF
Source:
tsvwg (tsv)

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Abstract

This document provides recommendations of best current practice for dropping or marking packets using any active queue management (AQM) algorithm, including Random Early Detection (RED), BLUE, Pre- Congestion Notification (PCN), and newer schemes such as CoDel (Controlled Delay) and PIE (Proportional Integral controller Enhanced). We give three strong recommendations: (1) packet size should be taken into account when transports detect and respond to congestion indications, (2) packet size should not be taken into account when network equipment creates congestion signals (marking, dropping), and therefore (3) in the specific case of RED, the byte- mode packet drop variant that drops fewer small packets should not be used. This memo updates RFC 2309 to deprecate deliberate preferential treatment of small packets in AQM algorithms.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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