ANSI ATIS T1.TR.78-2003 Access Availability of Routers in IP-Based Networks.pdf
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1、 TECHNICAL REPORT T1.TR.78-2003 Technical Report on Access Availability of Routers in IP-Based Networks Prepared by T1A1.2 Working Group on Network Survivability Performance Problem Solvers to the Telecommunications Industry A Word from ATIS and Committee T1 Established in February 1984, Committee T
2、1 develops technical standards, reports and requirements regarding interoperability of telecommunications networks at interfaces with end-user systems, carriers, information and enhanced-service providers, and customer premises equipment (CPE). Committee T1 is sponsored by ATIS and is accredited by
3、ANSI. T1.TR.78-2003 Published by Alliance for Telecommunications Industry Solutions 1200 G Street, NW, Suite 500 Washington, DC 20005 Committee T1 is sponsored by the Alliance for Telecommunications Industry Solutions (ATIS) and accredited by the American National Standards Institute (ANSI). Copyrig
4、ht 2003 by Alliance for Telecommunications Industry Solutions All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. For information contact ATIS at 202.628.6380. ATIS is o
5、nline at . Printed in the United States of America. T1.TR.78-2003 Technical Report on Access Availability of Routers in IP-Based Networks Alliance for Telecommunications Industry Solutions Approved January 2003 Abstract This Technical Report (TR) introduces the concepts for use in assessing the avai
6、lability of access to IP-based telecommunications networks. The calculation is based on the access availability of IP routers in the network. The TR presents alternate methods for weighting the availability calculation in terms of customers, ports, and bandwidth. This Technical Report is intended as
7、 the first in a series of Technical Reports, on the reliability metrics for IP-based networks. The next report will include Backbone networks thereby permitting a complete network availability assessment. ii T1.TR.78-2003 Foreword This Technical Report (TR) provides a practical way of assessing the
8、availability of access to IP-based telecommunications networks. It is intended as a guide for network reliability practitioners. Future reports will address reliability metrics for IP backbone networks. This TR is intended for providers of IP-based telecommunications networks and services, and telec
9、ommunications equipment suppliers. Suggestions for enhancement of this report are welcome. These should be sent to the Alliance for Telecommunications Industry Solutions, Suite 500, 1200 G Street N.W., Washington, D.C. 20005. Working Group T1A1.2 on Network Survivability Performance, which developed
10、 this report, has the following officers and participants: O. Avellaneda, T1A1.2 Chair S. Makris, T1A1.2 Vice-Chair F. Kaudel, T1A1.2 Chief Editor J. Bennett, Y. Kogan, and P. Tarapore, T1A1.2 Editors Active Participants: O. Avellaneda J. Bennett D. Clark W. Chiles C. Dvorak F. Kaudel Y. Kogan J. La
11、nkford J. Lord A. McCain A. Nguyen R. Paterson J. Rupe A. Webster R. Wohlert iii T1.TR.78-2003 Table of Contents 0 EXECUTIVE SUMMARY .1 1 PURPOSE, SCOPE, APPLICATION, OUTLINE, AND DISCLAIMER.1 1.1 PURPOSE.1 1.2 SCOPE.1 1.3 APPLICATION 1 1.4 OUTLINE 1 2 INTRODUCTION2 3 RELATED WORK2 3.1 T1A1 TECHNICA
12、L SUBCOMMITTEE2 3.2 OTHER T1 TECHNICAL SUBCOMMITTEES.2 3.3 INTERNATIONAL STANDARDS WORK AT THE ITU-T .2 3.4 OTHER FORUMS AND COMMITTEES.3 4 ACCESS NETWORK TOPOLOGY3 5 IP ROUTER ACCESS AVAILABILITY CONCEPTS5 5.1 IP ROUTER ACCESS TOTAL AVAILABILITY5 5.2 IP ROUTER ACCESS AVAILABILITY 5 5.3 AVERAGE IP R
13、OUTER ACCESS AVAILABILITY FOR A NETWORK 6 6 CONCLUSIONS.7 7 FUTURE WORK AND REQUEST FOR USER/INDUSTRY FEEDBACK7 8 BIBLIOGRAPHY7 9 DEFINITIONS 8 10 ABBREVIATIONS AND ACRONYMS .8 APPENDIX A: EXAMPLES OF IP ROUTER ACCESS AVAILABILITY CONCEPTS .9 A.1 EXAMPLE OF IP ROUTER ACCESS TOTAL AVAILABILITY.9 A.2
14、EXAMPLES OF IP ROUTER ACCESS AVAILABILITY .9 A.3 EXAMPLES OF AVERAGE IP ROUTER ACCESS AVAILABILITY FOR A NETWORK .11 APPENDIX B: TECHNIQUES FOR SCALING AVAILABILITY.14 Table of Figures FIGURE 1 - ACCESS NETWORK ELEMENTS 4 Table of Tables TABLE 1 - EXAMPLES OF EQUIVALENCIES14 iv Technical Report on A
15、ccess Availability of Routers in IP-Based Networks 0 Executive Summary This Technical Report (TR) provides a practical way of assessing the availability of access to IP-based telecommunications networks. It is intended as a guide for network reliability practitioners. 1 Purpose, Scope, Application,
16、Outline, and Disclaimer 1.1 Purpose This TR was developed in the interest of relating useful availability measures for access to IP-based networks. In particular, there is no widely accepted way of relating IP component failures to service outages as experienced by users of IP services. This TR is i
17、ntended to provide initial guidance in this area, with the goal of stimulating greater industry collaboration on IP reliability issues. This TR is complementary to other T1A1 work on IP performance of networks and services. 1.2 Scope This TR provides a practical way of assessing the availability of
18、access to IP networks. The use of these measures is demonstrated through examples. This methodology is seen as being highly useful because it complements the traditional methods for reliability assessments. While highly practical, this method is one of several possible methods that could be used for
19、 assessing IP network reliability, and is not intended to preclude the use of other methodologies. This TR addresses only IP-based access networks (and not IP-based backbone networks). Other than total loss of service from equipment outages, it does not include consideration of defects (such as dela
20、y, packet loss, and jitter) that may prevent satisfactory delivery of service. Work is ongoing at Working Group T1A1.2 in these areas. This TR will be useful to the industry with the understanding that these issues still need to be addressed. 1.3 Application The guidance in this TR applies to IP acc
21、ess networks. Subsequent reports will address IP core networks and IP services and applications. This TR is intended as the first in a series. 1.4 Outline Clause 0 provides an executive summary. Clause 1 describes the Purpose, Scope, Application, and Outline. Clause 2 provides an Introduction. Relat
22、ed Work is described in Clause 3. A generic access network topology is described in Clause 4. Clause 5 defines availability concepts for access to IP networks. Clause 6 presents the Conclusions. Clause 7 describes Future Work. Clause 8 presents a Bibliography. Definitions are presented in Clause 9.
23、Clause 10 contains Acronyms and Abbreviations. Appendix A presents examples of calculating IP router access availability. Appendix B describes alternate equivalent forms for expressing availability. 1 T1.TR.78-2003 2 Introduction With the proliferation of technologies such as IP-based systems, there
24、 is an urgent need to be able to relate the overall quality requirements to the performance and reliability of the many underlying network and system elements. Yet to date there is no well-accepted method in the industry for relating failures in network elements to service-level outages, so this Tec
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