This document specifies a baseline encoding for pre-congestion
notification states in a PCN domain. The baseline encoding assumes
that the ECN bits in the IP header can be used to encode two PCN
states ("Not-marked", "PCN-marked") for packets belonging to certain
Diffserv behavior aggregates. The PCN-compatible Diffserv codepoints
are not specified, and are assumed to be configurable on a domain
basis. It is assumed that normal ECN behavior is not available for
packets within these behavior aggregates; however, the encoding allows
packets in these behavior aggregates to be marked as "Not-PCN". The
proposed alternative semantics of the ECN bits is consistent with the
rules specified in RFC 4774.
Working Group Summary
The proposed encoding is the product of substantial discussion
The document shepherd was Steven Blake (email@example.com).
Lars Eggert (firstname.lastname@example.org) reviewed the document for the IESG.