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RFC 7560
Title: Problem Statement and Requirements for
Increased Accuracy in Explicit Congestion Notification
(ECN) Feedback
Author: M. Kuehlewind, Ed., R. Scheffenegger, B. Briscoe
Status: Informational
Stream: IETF
Date: August 2015
Mailbox: mirja.kuehlewind@tik.ee.ethz.ch,
rs@netapp.com,
ietf@bobbriscoe.net
Pages: 17
Characters: 40528
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-tcpm-accecn-reqs-08.txt
URL: https://www.rfc-editor.org/info/rfc7560
DOI: http://dx.doi.org/10.17487/RFC7560
Explicit Congestion Notification (ECN) is a mechanism where network
nodes can mark IP packets, instead of dropping them, to indicate
congestion to the endpoints. An ECN-capable receiver will feed this
information back to the sender. ECN is specified for TCP in such a
way that it can only feed back one congestion signal per Round-Trip
Time (RTT). In contrast, ECN for other transport protocols, such as
RTP/UDP and SCTP, is specified with more accurate ECN feedback.
Recent new TCP mechanisms (like Congestion Exposure (ConEx) or Data
Center TCP (DCTCP)) need more accurate ECN feedback in the case where
more than one marking is received in one RTT. This document
specifies requirements for an update to the TCP protocol to provide
more accurate ECN feedback.
This document is a product of the TCP Maintenance and Minor Extensions Working Group of the IETF.
INFORMATIONAL: This memo provides information for the Internet community.
It does not specify an Internet standard of any kind. Distribution of
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