Overview of Pre-Congestion Notification Encoding

Georgios Karagiannis, K. Chan, T. Moncaster, M. Menth, P Eardley, B. Briscoe

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    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.
    Original languageUndefined
    Title of host publicationProceeedings of the 84th Internet Engineering Task Force (IETF)
    Place of PublicationCanada
    PublisherInternet Engineering Task Force (IETF)
    Number of pages20
    ISBN (Print)2070-1721
    Publication statusPublished - Jul 2012
    Event84th Internet Engineering Task Force Meeting, IETF 2012 - Vancouver, Canada
    Duration: 29 Jul 20123 Aug 2012
    Conference number: 84

    Publication series

    NameRFC Document Series
    PublisherIETF (Ineternet Engineering Task Force)
    ISSN (Print)2070-1721


    Conference84th Internet Engineering Task Force Meeting, IETF 2012
    Abbreviated titleIETF
    Internet address


    • CR-C.2.2
    • CR-C.2.3
    • METIS-293300
    • EWI-22863
    • IR-83497
    • CR-C.2

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