A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Re-ECN: Adding Accountability for Causing Congestion to TCP/IP
Author(s) : Bob Briscoe
Arnaud Jacquet
Toby Moncaster
Alan Smith
Filename : draft-briscoe-conex-re-ecn-tcp-01.txt
Pages : 52
Date : 2012-10-22
Abstract:
This document introduces re-ECN (re-inserted explicit congestion
notification), which is intended to make a simple but far-reaching
change to the Internet architecture. The sender uses the IP header
to reveal the congestion that it expects on the end-to-end path. The
protocol works by arranging an extended ECN field in each packet so
that, as it crosses any interface in an internetwork, it will carry a
truthful prediction of congestion on the remainder of its path. It
can be deployed incrementally around unmodified routers. The purpose
of this document is to specify the re-ECN protocol at the IP layer
and to give guidelines on any consequent changes required to
transport protocols. It includes the changes required to TCP both as
an example and as a specification. It briefly gives examples of
mechanisms that can use the protocol to ensure data sources respond
sufficiently to congestion, but these are described more fully in a
companion document.
Note concerning Intended Status: If this draft were ever published as
an RFC it would probably have historic status. There is limited
space in the IP header, so re-ECN had to compromise by requiring the
receiver to be ECN-enabled otherwise the sender could not use re-ECN.
Re-ECN was a precursor to chartering of the IETF's Congestion
Exposure (ConEx) working group, but during chartering there were
still too few ECN receivers enabled, therefore it was decided to
pursue other compromises in order to fit a similar capability into
the IP header.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-briscoe-conex-re-ecn-tcp
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-briscoe-conex-re-ecn-tcp-01
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-briscoe-conex-re-ecn-tcp-01
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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