A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Transport Area Working Group Working Group of the IETF.
Title : Tunnelling of Explicit Congestion Notification
Author(s) : B. Briscoe
Filename : draft-ietf-tsvwg-ecn-tunnel-04.txt
Pages : 41
Date : 2009-10-26
This document redefines how the explicit congestion notification
(ECN) field of the IP header should be constructed on entry to and
exit from any IP in IP tunnel. On encapsulation it updates RFC3168
to bring all IP in IP tunnels (v4 or v6) into line with RFC4301 IPsec
ECN processing. On decapsulation it updates both RFC3168 and RFC4301
to add new behaviours for previously unused combinations of inner and
outer header. The new rules propagate the ECN field whether it is
used to signal one or two severity levels of congestion, whereas
before they propagated only one. Tunnel endpoints can be updated in
any order without affecting pre-existing uses of the ECN field
(backward compatible). Nonetheless, operators wanting to support two
severity levels (e.g. for pre-congestion notification--PCN) can
require compliance with this new specification. A thorough analysis
of the reasoning for these changes and the implications is included.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-ecn-tunnel-04.txt
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