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Byte and Packet Congestion Notification (RFC7141) Disclosure Number: IPCOM000235433D
Original Publication Date: 2014-Feb-01
Included in the Prior Art Database: 2014-Feb-27

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Briscoe: AUTHOR [+2]


This document provides recommendations of best current practice for how we should correctly scale congestion control functions with respect to packet size for the long term. It also recognises that expediency may be necessary to deal with existing widely deployed protocols that don't live up to the long-term goal.

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This is the abbreviated version, containing approximately 3% of the total text.

Internet Engineering Task Force (IETF)                        B. Briscoe Request for Comments: 7141                                            BT BCP: 41                                                        J. Manner Updates: 2309, 2914                                     Aalto University Category: Best Current Practice                            February 2014 ISSN: 2070-1721

                 Byte and Packet Congestion Notification


   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.

Status of This Memo

   This memo documents an Internet Best Current Practice.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    BCPs is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

 Briscoe & Manner          Best Current Practice                 [Page 1]
 RFC 7141         Byte and Packet Congestion Notification   February 2014

 Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisio...