The purpose of this document is to guide the design of congestion
notification in any lower layer or tunnelling protocol that
encapsulates IP. The aim is for explicit congestion signals to
propagate consistently from lower layer protocols into IP. Then the
IP internetwork layer can act as a portability layer to carry
congestion notification from non-IP-aware congested nodes up to the
transport layer (L4). Following these guidelines should assure
interworking among IP layer and lower layer congestion notification
mechanisms, whether specified by the IETF or other standards bodies.
This document is included in BCP 89 and updates the advice to
subnetwork designers about ECN in RFC 3819.
Working Group Summary
Sebastian Moeller repeatedly questioned on the mailing list the use of
recommendations that were based on an earlier BCP, i.e. RFC 7141, saying that
some of the earlier concepts recommended in RFC 7141 were yet to be
implemented. The chairs and editors are content that the current revision has
considered this feedback and looked into these topics, and that citing RFC 7141
is consistent with good practice.
This is a BCP that is not directly implementable, but 4 RFCs and 3 I-Ds referernce it.
The Document Shepherd for this document is Gorry Fairhurst. The
Responsible Area Director is Martin Duke.