Framework for Metric Composition
RFC 5835

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 09

Internet Engineering Task Force (IETF)                    A. Morton, Ed.
Request for Comments: 5835                                     AT&T Labs
Category: Informational                           S. Van den Berghe, Ed.
ISSN: 2070-1721                                           Alcatel-Lucent
                                                              April 2010

                    Framework for Metric Composition

Abstract

   This memo describes a detailed framework for composing and
   aggregating metrics (both in time and in space) originally defined by
   the IP Performance Metrics (IPPM), RFC 2330, and developed by the
   IETF.  This new framework memo describes the generic composition and
   aggregation mechanisms.  The memo provides a basis for additional
   documents that implement the framework to define detailed
   compositions and aggregations of metrics that are useful in practice.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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/rfc5835.

Morton and Van den Berghe     Informational                     [Page 1]
RFC 5835            Framework for Metric Composition          April 2010

Copyright Notice

   Copyright (c) 2010 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.

   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 and Van den Berghe     Informational                     [Page 2]
RFC 5835            Framework for Metric Composition          April 2010

Table of Contents

   1. Introduction ....................................................4
      1.1. Motivation .................................................4
           1.1.1. Reducing Measurement Overhead .......................4
           1.1.2. Measurement Re-Use ..................................5
           1.1.3. Data Reduction and Consolidation ....................5
           1.1.4. Implications on Measurement Design and Reporting ....6
   2. Requirements Language ...........................................6
   3. Purpose and Scope ...............................................6
   4. Terminology .....................................................7
      4.1. Measurement Point ..........................................7
      4.2. Complete Path ..............................................7
      4.3. Complete Path Metric .......................................7
      4.4. Complete Time Interval .....................................7
      4.5. Composed Metric ............................................7
      4.6. Composition Function .......................................7
      4.7. Ground Truth ...............................................8
      4.8. Interval ...................................................8
      4.9. Sub-Interval ...............................................8
      4.10. Sub-Path ..................................................8
      4.11. Sub-Path Metrics ..........................................8
   5. Description of Metric Types .....................................9
      5.1. Temporal Aggregation Description ...........................9
      5.2. Spatial Aggregation Description ............................9