Framework for Metric Composition
RFC 5835
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
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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
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