A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : More Accurate ECN Feedback in TCP
Authors : Bob Briscoe
Richard Scheffenegger
Mirja Kuehlewind
Filename : draft-kuehlewind-tcpm-accurate-ecn-03.txt
Pages : 55
Date : 2014-07-03
Abstract:
Explicit Congestion Notification (ECN) is a mechanism where network
nodes can mark IP packets instead of dropping them to indicate
incipient congestion to the end-points. Receivers with an ECN-
capable transport protocol feed back this information to the sender.
ECN is specified for TCP in such a way that only one feedback signal
can be transmitted per Round-Trip Time (RTT). Recently, new TCP
mechanisms like Congestion Exposure (ConEx) or Data Center TCP
(DCTCP) need more accurate ECN feedback information whenever more
than one marking is received in one RTT. This document specifies an
experimental scheme to provide more than one feedback signal per RTT
in the TCP header. Given TCP header space is scarce, it overloads
the three existing ECN-related flags in the TCP header. Also, to
improve robustness it uses 15 more bits if available. For initial
experiments it places these in a TCP option. However, if the Urgent
flag is cleared, zero header overhead could be achieved by reusing
the Urgent Pointer opportunistically. Therefore this document
reserves space in the Urgent Pointer to be used if the protocol
progresses to the standards track.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-kuehlewind-tcpm-accurate-ecn/
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-kuehlewind-tcpm-accurate-ecn-03
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-kuehlewind-tcpm-accurate-ecn-03
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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