[rfc-dist] RFC 6627 on Overview of Pre-Congestion Notification Encoding

rfc-editor at rfc-editor.org rfc-editor at rfc-editor.org
Wed Jul 18 17:12:32 PDT 2012


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        RFC 6627

        Title:      Overview of Pre-Congestion Notification Encoding 
        Author:     G. Karagiannis, K. Chan,
                    T. Moncaster, M. Menth,
                    P. Eardley, B. Briscoe
        Status:     Informational
        Stream:     IETF
        Date:       July 2012
        Mailbox:    g.karagiannis at utwente.nl, 
                    khchan.work at gmail.com, 
                    Toby.Moncaster at cl.cam.ac.uk,  
                    menth at informatik.uni-tuebingen.de, 
                    philip.eardley at bt.com,
                    bob.briscoe at bt.com
        Pages:      20
        Characters: 47274
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-pcn-encoding-comparison-09.txt

        URL:        http://www.rfc-editor.org/rfc/rfc6627.txt

The objective of Pre-Congestion Notification (PCN) is to protect
the quality of service (QoS) of inelastic flows within a Diffserv
domain.  On every link in the PCN-domain, the overall rate of
PCN-traffic is metered, and PCN-packets are appropriately marked when
certain configured rates are exceeded.  Egress nodes provide decision 
points with information about the PCN-marks of PCN-packets that allows them
to take decisions about whether to admit or block a new flow request,
and to terminate some already admitted flows during serious pre-congestion.

The PCN working group explored a number of approaches for encoding
this pre-congestion information into the IP header.  This document provides
details of those approaches along with an explanation of the constraints 
that apply to any solution.  This document is not an Internet Standards 
Track specification; it is published for informational purposes.

This document is a product of the Congestion and Pre-Congestion Notification Working Group of the IETF.


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