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Spatial Composition of Metrics
RFC 6049

Document type: RFC - Proposed Standard (January 2011)
Updated by RFC 6248
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 6049 (Proposed Standard)
Responsible AD: Lars Eggert
Send notices to: ippm-chairs@tools.ietf.org, draft-ietf-ippm-spatial-composition@tools.ietf.org

Internet Engineering Task Force (IETF)                         A. Morton
Request for Comments: 6049                                     AT&T Labs
Category: Standards Track                                     E. Stephan
ISSN: 2070-1721                                    France Telecom Orange
                                                            January 2011

                     Spatial Composition of Metrics

Abstract

   This memo utilizes IP performance metrics that are applicable to both
   complete paths and sub-paths, and it defines relationships to compose
   a complete path metric from the sub-path metrics with some accuracy
   with regard to the actual metrics.  This is called "spatial
   composition" in RFC 2330.  The memo refers to the framework for
   metric composition, and provides background and motivation for
   combining metrics to derive others.  The descriptions of several
   composed metrics and statistics follow.

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/rfc6049.

Morton & Stephan             Standards Track                    [Page 1]
RFC 6049                   Spatial Composition              January 2011

Copyright Notice

   Copyright (c) 2011 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
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   include Simplified BSD License text as described in Section 4.e of
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   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.

Morton & Stephan             Standards Track                    [Page 2]
RFC 6049                   Spatial Composition              January 2011

Table of Contents

   1. Introduction ....................................................4
      1.1. Motivation .................................................6
      1.2. Requirements Language ......................................6
   2. Scope and Application ...........................................6
      2.1. Scope of Work ..............................................6
      2.2. Application ................................................7
      2.3. Incomplete Information .....................................7
   3. Common Specifications for Composed Metrics ......................8
      3.1. Name: Type-P ...............................................8
           3.1.1. Metric Parameters ...................................8
           3.1.2. Definition and Metric Units .........................9
           3.1.3. Discussion and Other Details ........................9
           3.1.4. Statistic ...........................................9
           3.1.5. Composition Function ................................9
           3.1.6. Statement of Conjecture and Assumptions ............10
           3.1.7. Justification of the Composition Function ..........10
           3.1.8. Sources of Deviation from the Ground Truth .........10
           3.1.9. Specific Cases where the Conjecture Might Fail .....11
           3.1.10. Application of Measurement Methodology ............12
   4. One-Way Delay Composed Metrics and Statistics ..................12
      4.1. Name: Type-P-Finite-One-way-Delay-<Sample>-Stream .........12

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