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Baseline Encoding and Transport of Pre-Congestion Information (RFC5696)

IP.com Disclosure Number: IPCOM000190329D
Original Publication Date: 2009-Nov-01
Included in the Prior Art Database: 2009-Nov-24
Document File: 30 page(s) / 33K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

T. Moncaster: AUTHOR [+3]

Abstract

The objective of the Pre-Congestion Notification (PCN) architecture is to protect the quality of service (QoS) of inelastic flows within a Diffserv domain. It achieves this by marking packets belonging to PCN-flows when the rate of traffic exceeds certain configured thresholds on links in the domain. These marks can then be evaluated to determine how close the domain is to being congested. This document specifies how such marks are encoded into the IP header by redefining the Explicit Congestion Notification (ECN) codepoints within such domains. The baseline encoding described here provides only two PCN encoding states: Not-marked and PCN-marked. Future extensions to this encoding may be needed in order to provide more than one level of marking severity.

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Network Working Group                                       T. Moncaster Request for Comments: 5696                                    B. Briscoe Category: Standards Track                                             BT                                                                 M. Menth                                                  University of Wuerzburg                                                            November 2009

      Baseline Encoding and Transport of Pre-Congestion Information

Abstract

   The objective of the Pre-Congestion Notification (PCN) architecture    is to protect the quality of service (QoS) of inelastic flows within    a Diffserv domain.  It achieves this by marking packets belonging to    PCN-flows when the rate of traffic exceeds certain configured    thresholds on links in the domain.  These marks can then be evaluated    to determine how close the domain is to being congested.  This    document specifies how such marks are encoded into the IP header by    redefining the Explicit Congestion Notification (ECN) codepoints    within such domains.  The baseline encoding described here provides    only two PCN encoding states: Not-marked and PCN-marked.  Future    extensions to this encoding may be needed in order to provide more    than one level of marking severity.

Status of This Memo

   This document specifies an Internet standards track protocol for the    Internet community, and requests discussion and suggestions for    improvements.  Please refer to the current edition of the "Internet    Official Protocol Standards" (STD 1) for the standardization state    and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (c) 2009 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    (http://trustee.ietf.org/license-info) in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the BSD License.

 Moncaster, et al.           Standards Track                     [Page 1]
 RFC 5696                 Baseline PCN Encoding           ...