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Network performance measurement with periodic streams
RFC 3432

Network Working Group                                        V. Raisanen
Request for Comments: 3432                                         Nokia
Category: Standards Track                                   G. Grotefeld
                                                                Motorola
                                                               A. Morton
                                                               AT&T Labs
                                                           November 2002

         Network performance measurement with periodic streams

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) The Internet Society (2002).  All Rights Reserved.

Abstract

   This memo describes a periodic sampling method and relevant metrics
   for assessing the performance of IP networks.  First, the memo
   motivates periodic sampling and addresses the question of its value
   as an alternative to the Poisson sampling described in RFC 2330.  The
   benefits include applicability to active and passive measurements,
   simulation of constant bit rate (CBR) traffic (typical of multimedia
   communication, or nearly CBR, as found with voice activity
   detection), and several instances in which analysis can be
   simplified.  The sampling method avoids predictability by mandating
   random start times and finite length tests.  Following descriptions
   of the sampling method and sample metric parameters, measurement
   methods and errors are discussed.  Finally, we give additional
   information on periodic measurements, including security
   considerations.

Raisanen, et al.            Standards Track                     [Page 1]
RFC 3432            Network performance measurement        November 2002

Table of Contents

   1.  Conventions used in this document...........................  2
   2.  Introduction................................................  3
       2.1 Motivation..............................................  3
   3.  Periodic Sampling Methodology...............................  4
   4.  Sample metrics for periodic streams.........................  5
       4.1 Metric name.............................................  5
       4.2 Metric parameters.......................................  5
       4.3 High level description of the procedure to collect a
           sample..................................................  7
       4.4 Discussion..............................................  8
       4.5 Additional Methodology Aspects..........................  9
       4.6 Errors and uncertainties................................  9
       4.7 Reporting............................................... 13
   5.  Additional discussion on periodic sampling.................. 14
       5.1 Measurement applications................................ 15
       5.2 Statistics calculable from one sample................... 18
       5.3 Statistics calculable from multiple samples............. 18
       5.4 Background conditions................................... 19
       5.5 Considerations related to delay......................... 19
   6.  Security Considerations..................................... 19
       6.1 Denial of Service Attacks............................... 19
       6.2 User data confidentiality............................... 20
       6.3 Interference with the metric............................ 20
   7.  IANA Considerations......................................... 20
   8.  Normative References........................................ 20
   9.  Informative References...................................... 21
   10. Acknowledgments............................................. 21
   11. Author's Addresses.......................................... 22
   12. Full Copyright Statement.................................... 23

1. Conventions used in this document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in BCP 14, RFC 2119 [2].
   Although RFC 2119 was written with protocols in mind, the key words
   are used in this document for similar reasons.  They are used to
   ensure that the results of measurements from two different
   implementations are comparable, and to note instances in which an
   implementation could perturb the network.

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