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Metering and Marking Behaviour of PCN-Nodes
RFC 5670

Network Working Group                                    P. Eardley, Ed.
Request for Comments: 5670                                            BT
Category: Standards Track                                  November 2009

              Metering and Marking Behaviour of PCN-Nodes

Abstract

   The objective of Pre-Congestion Notification (PCN) is to protect the
   quality of service (QoS) of inelastic flows within a Diffserv domain
   in a simple, scalable, and robust fashion.  This document defines the
   two metering and marking behaviours of PCN-nodes.  Threshold-metering
   and -marking marks all PCN-packets if the rate of PCN-traffic is
   greater than a configured rate ("PCN-threshold-rate").  Excess-
   traffic-metering and -marking marks a proportion of PCN-packets, such
   that the amount marked equals the rate of PCN-traffic in excess of a
   configured rate ("PCN-excess-rate").  The level of marking allows
   PCN-boundary-nodes to make decisions about whether to admit or
   terminate PCN-flows.

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
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   described in the BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow

Eardley                     Standards Track                     [Page 1]
RFC 5670                PCN metering and marking           November 2009

   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................2
      1.1. Terminology ................................................4
           1.1.1. Requirements Language ...............................5
   2. Specified PCN-Metering and -Marking Behaviours ..................5
      2.1. Behaviour Aggregate Classification Function ................5
      2.2. Dropping Function ..........................................5
      2.3. Threshold-Meter Function ...................................6
      2.4. Excess-Traffic-Meter Function ..............................6
      2.5. Marking Function ...........................................7
   3. Security Considerations .........................................7
   4. Acknowledgements ................................................8
   5. References ......................................................8
      5.1. Normative Reference ........................................8
      5.2. Informative References .....................................8
   Appendix A.  Example Algorithms ...................................11
     A.1.  Threshold-Metering and -Marking ...........................11
     A.2.  Excess-Traffic-Metering and -Marking ......................12
   Appendix B.  Implementation Notes .................................13
     B.1.  Competing-Non-PCN-Traffic .................................13
     B.2.  Scope .....................................................14
     B.3.  Behaviour Aggregate Classification ........................15
     B.4.  Dropping ..................................................15
     B.5.  Threshold-Metering ........................................17
     B.6.  Excess-Traffic-Metering ...................................18
     B.7.  Marking ...................................................19

1.  Introduction

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