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Specifying Alternate Semantics for the Explicit Congestion Notification (ECN) Field

Document Type Expired Internet-Draft (individual)
Expired & archived
Author Sally Floyd
Last updated 2005-08-19
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


There have been a number of proposals for alternate semantics for the ECN field in the IP header [ECN]. This document discusses some of the issues in defining alternate semantics for the ECN field, and specifies requirements for a safe co-existence in an Internet that could include routers that do not understand the defined alternate semantics. This document evolved as a result of discussions with the authors of one recent proposal for such alternate semantics.


Sally Floyd

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)