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Loss Episode Metrics for IP Performance Metrics (IPPM)
RFC 6534

Internet Engineering Task Force (IETF)                       N. Duffield
Request for Comments: 6534                            AT&T Labs-Research
Category: Standards Track                                      A. Morton
ISSN: 2070-1721                                                AT&T Labs
                                                              J. Sommers
                                                      Colgate University
                                                                May 2012

         Loss Episode Metrics for IP Performance Metrics (IPPM)

Abstract

   The IETF has developed a one-way packet loss metric that measures the
   loss rate on a Poisson and Periodic probe streams between two hosts.
   However, the impact of packet loss on applications is, in general,
   sensitive not just to the average loss rate but also to the way in
   which packet losses are distributed in loss episodes (i.e., maximal
   sets of consecutively lost probe packets).  This document defines
   one-way packet loss episode metrics, specifically, the frequency and
   average duration of loss episodes and a probing methodology under
   which the loss episode metrics are to be measured.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in 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/rfc6534.

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

Duffield, et al.             Standards Track                    [Page 1]
RFC 6534              Loss Episode Metrics for IPPM             May 2012

   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.

   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
   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 ....................................................4
      1.1. Background and Motivation ..................................4
           1.1.1. Requirements Language ...............................5
      1.2. Loss Episode Metrics and Bi-Packet Probes ..................5
      1.3. Outline and Contents .......................................6
   2. Singleton Definition for Type-P-One-way Bi-Packet Loss ..........7
      2.1. Metric Name ................................................7
      2.2. Metric Parameters ..........................................7
      2.3. Metric Units ...............................................7
      2.4. Metric Definition ..........................................7
      2.5. Discussion .................................................8
      2.6. Methodologies ..............................................8
      2.7. Errors and Uncertainties ...................................8
      2.8. Reporting the Metric .......................................8
   3. General Definition of Samples for
      Type-P-One-way-Bi-Packet-Loss ...................................8
      3.1. Metric Name ................................................9
      3.2. Metric Parameters ..........................................9
      3.3. Metric Units ...............................................9
      3.4. Metric Definition ..........................................9
      3.5. Discussion .................................................9

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