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Pre-Congestion Notification (PCN) Boundary-Node Behavior for the Single Marking (SM) Mode of Operation
RFC 6662

Internet Engineering Task Force (IETF)                         A. Charny
Request for Comments: 6662
Category: Experimental                                          J. Zhang
ISSN: 2070-1721                                            Cisco Systems
                                                          G. Karagiannis
                                                    University of Twente
                                                                M. Menth
                                                 University of Tuebingen
                                                          T. Taylor, Ed.
                                                     Huawei Technologies
                                                               July 2012

        Pre-Congestion Notification (PCN) Boundary-Node Behavior
             for the Single Marking (SM) Mode of Operation

Abstract

   Pre-Congestion Notification (PCN) is a means for protecting the
   quality of service for inelastic traffic admitted to a Diffserv
   domain.  The overall PCN architecture is described in RFC 5559.  This
   memo is one of a series describing possible boundary-node behaviors
   for a PCN-domain.  The behavior described here is that for a form of
   measurement-based load control using two PCN marking states: not-
   marked and excess-traffic-marked.  This behavior is known informally
   as the Single Marking (SM) PCN-boundary-node behavior.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  This document is a product of the Internet Engineering
   Task Force (IETF).  It represents the consensus of the IETF
   community.  It has received public review and has been approved for
   publication by the Internet Engineering Steering Group (IESG).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6662.

Charny, et al.                Experimental                      [Page 1]
RFC 6662              PCN SM Boundary-Node Behavior            July 2012

Copyright Notice

   Copyright (c) 2012 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 Simplified BSD License.

Charny, et al.                Experimental                      [Page 2]
RFC 6662              PCN SM Boundary-Node Behavior            July 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  5
   2.  [SM-Specific] Assumed Core Network Behavior for SM . . . . . .  8
   3.  Node Behaviors . . . . . . . . . . . . . . . . . . . . . . . .  9
     3.1.  Overview . . . . . . . . . . . . . . . . . . . . . . . . .  9
     3.2.  Behavior of the PCN-Egress-Node  . . . . . . . . . . . . .  9
       3.2.1.  Data Collection  . . . . . . . . . . . . . . . . . . .  9
       3.2.2.  Reporting the PCN Data . . . . . . . . . . . . . . . . 10
       3.2.3.  Optional Report Suppression  . . . . . . . . . . . . . 10
     3.3.  Behavior at the Decision Point . . . . . . . . . . . . . . 11
       3.3.1.  Flow Admission . . . . . . . . . . . . . . . . . . . . 11
       3.3.2.  Flow Termination . . . . . . . . . . . . . . . . . . . 12
       3.3.3.  Decision Point Action for Missing
               PCN-Boundary-Node Reports  . . . . . . . . . . . . . . 14
     3.4.  Behavior of the Ingress Node . . . . . . . . . . . . . . . 15
     3.5.  Summary of Timers and Associated Configurable Durations  . 15
       3.5.1.  Recommended Values for the Configurable Durations  . . 17
   4.  Specification of Diffserv Per-Domain Behavior  . . . . . . . . 17
     4.1.  Applicability  . . . . . . . . . . . . . . . . . . . . . . 17
     4.2.  Technical Specification  . . . . . . . . . . . . . . . . . 18
       4.2.1.  Classification and Traffic Conditioning  . . . . . . . 18
       4.2.2.  PHB Configuration  . . . . . . . . . . . . . . . . . . 18

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