A Model for Common Operational Statistics
RFC 1404

Document Type RFC - Informational (January 1993; No errata)
Obsoleted by RFC 1857
Last updated 2013-03-02
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Network Working Group                                        B. Stockman
Request for Comments: 1404                                NORDUnet/SUNET
                                                            January 1993

               A Model for Common Operational Statistics

Status of the Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard.  Distribution of this memo is
   unlimited.

Abstract

   This memo describes a model for operational statistics in the
   Internet.  It gives recommendations for metrics, measurements,
   polling periods, storage formats and presentation formats.

Acknowledgements

   The author would like to thank the members of the Operational
   Statistics Working Group of the IETF whose efforts made this memo
   possible.

Table of Contents

   1.      Introduction ............................................. 2
   2.      The Model ................................................ 5
   2.1     Metrics and Polling Periods .............................. 5
   2.2     Format for Storing Collected Data ........................ 6
   2.3     Reports .................................................. 6
   2.4     Security Issues .......................................... 6
   3.      Categorization of Metrics ................................ 7
   3.1     Overview ................................................. 7
   3.2     Categorization of Metrics Based on Measurement Areas ..... 7
   3.2.1   Utilization Metrics ...................................... 7
   3.2.2   Performance Metrics ...................................... 7
   3.2.3   Availability Metrics ..................................... 7
   3.2.4   Stability Metrics ........................................ 8
   3.3     Categorization Based on Availability of Metrics .......... 8
   3.3.1   Per Interface Variables Already in Standard MIB .......... 8
   3.3.2   Per Interface Variables in Private Enterprise MIB ........ 9
   3.3.3   Per interface Variables Needing High Resolution Polling .. 9
   3.3.4   Per Interface Variables not in any MIB ................... 9
   3.3.5   Per Node Variables ....................................... 9
   3.3.6   Metrics not being Retrievable with SNMP ................. 10
   3.4     Recommended Metrics ..................................... 10

Stockman                                                        [Page 1]
RFC 1404                 Operational Statistics             January 1993

   3.4.1   Chosen Metrics .......................................... 10
   4.      Polling Frequencies ..................................... 11
   4.1     Variables Needing High Resolution Polling ............... 11
   4.2     Variables not Needing High Resolution Polling ........... 11
   5.      Pre-Processing of Raw Statistical Data .................. 12
   5.1     Optimizing and Concentrating Data to Resources .......... 12
   5.2     Aggregation of Data ..................................... 12
   6.      Storing of Statistical Data ............................. 13
   6.1     The Storage Format ...................................... 13
   6.1.1   The Label Section ....................................... 14
   6.1.2   The Device Section ...................................... 14
   6.1.3   The Data Section ........................................ 16
   6.2     Storage Requirement Estimations ......................... 17
   7.      Report Formats .......................................... 18
   7.1     Report Types and Contents ............................... 18
   7.2     Contents of the Reports ................................. 18
   7.2.1   Offered Load by Link .................................... 18
   7.2.2   Offered Load by Customer ................................ 18
   7.2.3   Resource Utilization Reporting .......................... 19
   7.2.3.1 Utilization as Maximum Peak Behavior .................... 19
   7.2.3.2 Utilization as Frequency Distribution of Peaks .......... 19
   8.      Considerations for Future Development ................... 20
   8.1     A Client/Server Based Statistical Exchange System ....... 20
   8.2     Inclusion of Variables not in the Internet Standard MIB . 20
   8.3     Detailed Resource Utilization Statistics ................ 20
   Appendix A  Some formulas for statistical aggregation ........... 21
   Appendix B  An example .......................................... 24
   Security Considerations ......................................... 27
   Author's Address ................................................ 27

1. Introduction

   Today it is not uncommon for many network administrations to collect
   and archive network management metrics that indicate network
   utilization, growth, and outages.  The primary goal is to facilitate
   near-term problem isolation and longer-term network planning within
   the organization.  There is also the larger goal of cooperative
   problem isolation and network planning between network
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