Methodology for communication network dependability assessment and assurance

IEC 62673:2013 describes a generic methodology for dependability assessment and assurance of communication networks from a network life cycle perspective. It presents the network dependability assessment strategies and methodology for analysis of network topology, evaluation of dependability of service paths, and optimization of network configurations in order to achieve network dependability performance and dependability of service. It also addresses the network dependability assurance strategies and methodology for application of network health check, network outage control and test case management to enhance and sustain dependability performance in network service operation. This standard is applicable to network service providers, network designers and developers, and network maintainers and operators for assurance of network dependability performance and assessment of dependability of service. Keywords: methodology for dependability assessment and assurance of communication networks

Methodik zur Beurteilung und Sicherstellung der Zuverlässigkeit von Kommunikationsnetzen

Méthodologie pour l’évaluation et l’assurance de la sûreté de fonctionnement des réseaux de communication

La CEI 62673:2013 décrit une méthodologie générale pour l'évaluation et l'assurance de la sûreté de fonctionnement des réseaux de communication du point de vue du cycle de vie d'un réseau. Elle présente les stratégies d'évaluation de la sûreté de fonctionnement d'un réseau ainsi que la méthodologie pour l'analyse de la topologie d'un réseau, l'évaluation de la sûreté de fonctionnement des trajet de services et l'optimisation des configurations de réseau afin d'obtenir les performances de sûreté de fonctionnement du réseau et de sûreté de fonctionnement des services. Elle traite également des stratégies d'assurance de la sûreté de fonctionnement du réseau ainsi que de la méthodologie pour l'application de la vérification de l'état de santé du réseau, du contrôle de la fréquence d'interruption du réseau et de la gestion des tests élémentaires pour améliorer et maintenir les performances de sûreté de fonctionnement des services de réseau. La présente norme est applicable aux fournisseurs de services de réseaux, aux concepteurs et développeurs de réseaux, ainsi qu'aux spécialistes de la maintenance et aux opérateurs de réseaux pour la garantie des performances de sûreté de fonctionnement des réseaux et l'évaluation de la sûreté de fonctionnement des services. Mots clés: méthodologie pour l'évaluation et l'assurance de la sûreté de fonctionnement des réseaux de communication

Metodologija za ocenjevanje in zagotavljanje zagotovljivosti komunikacijskega omrežja (IEC 62673:2013)

Ta mednarodni standard opisuje splošno metodologijo za ocenjevanje in zagotavljanje zagotovljivosti komunikacijskih omrežij z vidika življenjskega cikla omrežja. Podaja strategije za ocenjevanje zagotovljivosti omrežij in metodologijo za analizo topologije omrežij, ocenjevanje zanesljivosti storitvenih poti in optimizacijo omrežnih konfiguracij za zagotavljanje zagotovljivosti delovanja omrežij in zanesljivosti storitev. Prav tako obravnava strategije za zagotavljanje zagotovljivosti omrežij in metodologijo za preverjanje stanja omrežja, nadzor izpada omrežja in upravljanje preskuševalnih primerov za izboljševanje in vzdrževanje zagotovljivosti delovanja omrežja. Ta standard velja za ponudnike storitev omrežja, omrežne načrtovalce in razvijalce, vzdrževalce razpoložljivosti omrežja ter upravljavce pri zagotavljanju zagotovljivosti delovanja omrežja in ocenjevanju zanesljivosti storitev.

General Information

Status
Published
Publication Date
29-Aug-2013
Technical Committee
Drafting Committee
Current Stage
6060 - Document made available
Due Date
30-Aug-2013
Completion Date
30-Aug-2013

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Metodologija za ocenjevanje in zagotavljanje zagotovljivosti komunikacijskega omrežja (IEC 62673:2013)/Méthodologie pour l’évaluation et l’assurance de la sûreté de fonctionnement des réseaux de communicationMethodology for communication network dependability assessment and assurance33.040.40Podatkovna komunikacijska omrežjaData communication networks03.120.99Drugi standardi v zvezi s kakovostjoOther standards related to qualityICS:Ta slovenski standard je istoveten z:EN 62673:2013SIST EN 62673:2014en01-maj-2014SIST EN 62673:2014SLOVENSKI

STANDARD
SIST EN 62673:2014
EUROPEAN STANDARD EN 62673 NORME EUROPÉENNE
EUROPÄISCHE NORM August 2013

CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2013 CENELEC -

All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62673:2013 E
ICS 03.120.01
English version

Methodology for communication network dependability assessment and assurance (IEC 62673:2013)

Méthodologie pour l’évaluation et l’assurance de la sûreté de fonctionnement des réseaux de communication (CEI 62673:2013)

Methodik zur Beurteilung und Sicherstellung der Zuverlässigkeit von Kommunikationsnetzen (IEC 62673:2013)

This European Standard was approved by CENELEC on 2013-07-23. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

SIST EN 62673:2014
EN 62673:2013 - 2 -

Foreword The text of document 56/1507/FDIS, future edition 1 of IEC 62673, prepared by IEC/TC 56 "Dependability" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62673:2013. The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2014-04-23 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-07-23

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

Endorsement notice The text of the International Standard IEC 62673:2013 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 61078 NOTE Harmonised as EN 61078. IEC 62198 NOTE Harmonised as EN 62198. IEC 60812 NOTE Harmonised as EN 60812. IEC 60300-3-11 NOTE Harmonised as EN 60300-3-11. IEC 60300-3-1 NOTE Harmonised as EN 60300-3-1. IEC 61165 NOTE Harmonised as EN 61165 SIST EN 62673:2014

- 3 - EN 62673:2013
Annex ZA
(normative)

Normative references to international publications with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

NOTE

When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.

Publication Year Title EN/HD Year
IEC 60050-191
International Electrotechnical Vocabulary (IEV) -
Chapter 191: Dependability and quality of service - -
IEC 60300-3-15
Dependability management -
Part 3-15: Application guide - Engineering of system dependability EN 60300-3-15
IEC 61907
Communication network dependability engineering EN 61907
SIST EN 62673:2014
SIST EN 62673:2014

IEC 62673 Edition 1.0 2013-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Methodology for communication network dependability assessment and assurance

Méthodologie pour l'évaluation et l'assurance de la sûreté de fonctionnement d'un réseau de communication

INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE W ICS 03.120.01 PRICE CODE CODE PRIX ISBN 978-2-83220-871-7

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé. SIST EN 62673:2014 colourinside

– 2 – 62673  IEC:2013 CONTENTS FOREWORD ........................................................................................................................... 4 INTRODUCTION ..................................................................................................................... 6 1 Scope ............................................................................................................................... 7 2 Normative references ....................................................................................................... 7 3 Terms, definitions and abbreviations ................................................................................ 7

Terms and definitions .............................................................................................. 7 3.1 Abbreviations ........................................................................................................ 11 3.24 Overview of network dependability methodology ............................................................. 11

Need for network dependability methods ............................................................... 11 4.1 Network dependability objectives ........................................................................... 12 4.2 Network service scenarios ..................................................................................... 13 4.3 Network dependability assessment strategies ........................................................ 13 4.4 Network dependability assurance strategies .......................................................... 14 4.55 Network dependability methodology applications ............................................................ 15

Network life cycle process ..................................................................................... 15 5.1 Life cycle process applications .................................................................. 15 5.1.1 Risk assessment process applications ....................................................... 15 5.1.2 Dependability methodology applications .................................................... 16 5.1.3 Network dependability performance characteristics ............................................... 17 5.2 Network dependability assessment methodology ................................................... 18 5.3 Generic dependability analysis and evaluation techniques ......................... 18 5.3.1 Service scenario analysis .......................................................................... 19 5.3.2 Network modelling ..................................................................................... 19 5.3.3 Network failure modes, effects and criticality analysis ............................... 20 5.3.4 Network fault insertion test ........................................................................ 21 5.3.5 Failure reporting, analysis and corrective action system ............................ 22 5.3.6 Network dependability assurance methodology ..................................................... 22 5.4 Scope of dependability assurance methodology applications ..................... 22 5.4.1 Assurance of dependability of service ........................................................ 23 5.4.2 Assurance of data integrity ........................................................................ 23 5.4.3 Assurance of network performance functions and support process 5.4.4enhancement ............................................................................................. 24

Network dependability assurance methods ................................................ 24 5.4.5Annex A (informative)

Example of E2E network dependability assessment .......................... 27 Annex B (informative)

Example of full-end network dependability assessment ..................... 33 Annex C (informative)

Evaluation of network dependability performance in field operation .............................................................................................................................. 35 Bibliography .......................................................................................................................... 37

Figure A.1 – A typical example of an E2E network topology .................................................. 27 Figure B.1 – A typical example of a full-end network topology ............................................... 33 Figure C.1 – Network outage contributions and resultant network service impact .................. 36

SIST EN 62673:2014
62673  IEC:2013 – 3 –

Table 1 – Summary of network dependability activities and application methods ................... 17 Table 2 – Summary of network dependability parameters...................................................... 18 Table C.1 – Summary of network failure data of a nation-wide public switched telephone network ................................................................................................................ 35

SIST EN 62673:2014
– 4 – 62673  IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
METHODOLOGY FOR COMMUNICATION NETWORK
DEPENDABILITY ASSESSMENT AND ASSURANCE

FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62673 has been prepared by IEC technical committee 56: Dependability. The text of this standard is based on the following documents: FDIS Report on voting 56/1507/FDIS 56/1514/RVD

Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. SIST EN 62673:2014

62673  IEC:2013 – 5 – The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be

• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer.

SIST EN 62673:2014

– 6 – 62673  IEC:2013 INTRODUCTION Communication network dependability is highly influenced by the design and implementation of the network service functions, which aim to achieve user satisfaction in service performance.

Network evolution, service growth and functional renewal in communications have long been challenges to the providers of network services, not just for the broad range of services now in existence, but also for those service-related activities experienced by the end-users.

To sustain viable business in network services, it is prudent for the communications industry to provide the

– needed network service functions, – adequate network capacity and performance capability, – security of service,

– quality of service, and
– dependability of service.

This International Standard addresses one of the most important issues concerning the assessment and delivery of dependability of service to ensure network service performance. It also addresses the network dependability assurance strategies and methodology applications for enhancing and sustaining network operation. This International Standard describes a generic methodology for dependability assessment and assurance of communication networks. It also provides relevant assessment and assurance methods to support communication networks for dependability engineering application, such as those conforming to IEC 61907 and ITU-T1 Recommendations concerning dependability.

It presents an approach for network dependability analysis and evaluation that ensures dependable network design for effective implementation.

The objective of this standard is to achieve a cost-effective solution for realizing the network dependability performance and to assure the benefits from the network dependability of service operation. ______________ 1 ITU-T: International Telecommunications Union – Telecommunications. SIST EN 62673:2014

62673  IEC:2013 – 7 – METHODOLOGY FOR COMMUNICATION NETWORK
DEPENDABILITY ASSESSMENT AND ASSURANCE
1 Scope

This International Standard describes a generic methodology for dependability assessment and assurance of communication networks from a network life cycle perspective. It presents the network dependability assessment strategies and methodology for analysis of network topology, evaluation of dependability of service paths, and optimization of network configurations in order to achieve network dependability performance and dependability of service. It also addresses the network dependability assurance strategies and methodology for application of network health check, network outage control and test case management to enhance and sustain dependability performance in network service operation. This standard is applicable to network service providers, network designers and developers, and network maintainers and operators for assurance of network dependability performance and assessment of dependability of service. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-191, International Electrotechnical Vocabulary (IEV) – Chapter 191: Dependability and quality of service

IEC 60300-3-15, Dependability management – Part 3-15: Application guide – Engineering of system dependability IEC 61907, Communication network dependability engineering 3 Terms, definitions and abbreviations

Terms and definitions 3.1For the purposes of this document, the terms and definitions given in IEC 60050-191 and IEC 61907, as well as the following, apply.

3.1.1communication network system of communication nodes and links that provides transmission of analogue and digital signals EXAMPLES Telecommunications networks, Internet, intranet, extranet, Wide Area Networks (WAN), Local Area Networks (LAN) and computer networking utilizing information technology.

Note 1 to entry: A network has its boundary. All nodes at the network boundary are called ends. In some applications, the term “node” is used instead of “end” as a communication access point to the network, as well as for interconnections between the transmission links. Note 2 to entry: A “backbone” communication network consists of core network and high-speed transmission lines (national or international), connecting between major switching network nodes (interconnection of transmission lines) at various locations in a country or region. SIST EN 62673:2014

– 8 – 62673  IEC:2013

3.1.2dependability network dependability ability to perform as and when required to meet specified communication and operational requirements

3.1.3availability network availability ability to be in a state to perform as required

Note 1 to entry: Availability depends upon the combined characteristics of the reliability, recoverability and maintainability of the network and on the maintenance support performance. Note 2 to entry: Availability may be quantified using appropriate performance measures.

3.1.4reliability network reliability ability to perform as required, without failure, for a given time interval, under given conditions Note 1 to entry: The time interval duration may be expressed in units appropriate to the network concerned. Note 2 to entry: Reliability of a network depends upon the combined characteristics of the reliability, recoverability, maintainability and maintenance support performance of the constituent network elements. Note 3 to entry: Given conditions include aspects that affect reliability, such as: mode of operation, stress levels, environmental conditions, and maintenance. Note 4 to entry: Reliability may be quantified using appropriate performance measures.

3.1.5maintainability network maintainability ability to be retained in, or restored to a state to perform as required under given conditions of use and maintenance Note 1 to entry: Given conditions include aspects that affect maintainability, such as: location for maintenance, accessibility, maintenance procedures and maintenance resources. Note 2 to entry: Maintainability may be quantified using appropriate performance measures.

3.1.6maintenance support network maintenance support provision of resources to maintain a network

Note 1 to entry: Resources include human resources, support equipment, materials and spare parts, maintenance facilities, documentation, information and maintenance information systems.

3.1.7maintenance support performance network maintenance support performance effectiveness of an organization in respect of maintenance support for the network Note 1 to entry: Maintenance support performance may be quantified using appropriate measures.

3.1.8recoverability network recoverability ability to recover from a failure, without corrective maintenance

Note 1 to entry: The ability to recover may or may not require external actions. SIST EN 62673:2014

62673  IEC:2013 – 9 – Note 2 to entry: Recoverability may be quantified using such measures as the probability of recovery within a specified time interval.

3.1.9element network element subsystem or component of a communication network

EXAMPLES Terminals, nodes and switches. Note 1 to entry: A network element may involve human input to perform its service function. Note 2 to entry: Network elements are connected by network links.

3.1.10link network link electrical, wireless or optical connection between network nodes

3.1.11performance network performance ability to provide the service functions related to communications between users

[SOURCE: ITU-T Recommendation I.350:1988][1]2

3.1.12management network management application of organized processes and resources to manage the performance, configuration, accounting, fault, and security activities

3.1.13service function network service function program or application that interacts with the network users or within the network infrastructure to transmit or exchange data and information in the network

Note 1 to entry: A network service function may consist of hardware and software elements, and may involve human interactions for realizing a specific function.

3.1.14network services

provision of network service functions and communication services to the network users Note 1 to entry: Communication services are the network services subscribed by the end-users.

Note 2 to entry: A bearer service is a communication service function that allows transmission of user-information signals between user-network interfaces.

3.1.15quality of service collective effect of service performance that determines the degree of satisfaction of a user of the service

3.1.16network failure loss of ability of a network to perform as required ______________ 2 References in square brackets refer to the Bibliography. SIST EN 62673:2014

– 10 – 62673  IEC:2013 Note 1 to entry: The network failure may be due to, for example, equipment failure, natural disasters or human-caused disturbance.

3.1.17network fault state of inability of a network to perform as required, for internal reason Note 1 to entry: In the context of network operation, a fault may be natural due to an abnormal condition, or malfunction resulting from a network element failure, or induced by external means such as fault injection.

Note 2 to entry: A degraded state in network performance is a situation where one or more performance characteristics do not conform to requirements.

3.1.18service provider organization that provides communication network services EXAMPLES Telephone companies, data carriers, mobile service providers, Internet service providers and cable television operators.

Note 1 to entry: A network carrier or common carrier is an organization that transports a product or service using its facilities or those of other carriers, and offers services to the general public. The term communication carrier refers to various telephone companies that provide local, long distance or value added services.

3.1.19user party that employs the services of a service provider for direct network access Note 1 to entry: A user may be a source or recipient of user information, or both.

Note 2 to entry: In some circumstances, a user of a communication service is also known as a subscriber.

3.1.20integrity
network integrity

ability to ensure that the data contents are not contaminated, corrupted, lost or altered between transmission and reception Note 1 to entry: Throughput is the rate of successful message delivery over a communication channel of a network service.

3.1.21dependability performance network dependability performance ability to provide or demonstrate the performance characteristics of dependability in network operation to achieve network service objectives Note 1 to entry: In the context of this standard, network dependability performance refers to the provision of full-end network services. Note 2 to entry: A full-end network service is the provision of service connectivity established for all transmission and reception ends of a communication network.

3.1.22dependability of service network dependability of service effect of providing the required dependability performance for user communications services

Note 1 to entry: In the context of this standard, network dependability of service refers to the provision of end-to-end (E2E) network services. Note 2 to entry: An end-to-end network service is the provision of service connectivity established between the transmission and reception ends of a communication network.

SIST EN 62673:2014
62673  IEC:2013 – 11 –

3.1.23security of service network security of service effect of providing the required security for user communications services

3.1.24service path network service path connecting path by network links and nodes to establish user communications services

3.1.25service flow network service flow flow of information and data through the service path

3.1.26service scenario operational situation in communication network for provision of network service functions and user service applications

3.1.27network outage state of the network being unable to perform its primary function

Abbreviations 3.2E2E End-to-End FRACAS Failure Reporting, Analysis, Corrective Action System FRU Field Return Unit HAZOP Hazard and operability studies MTTR Mean Time to Restoration of Node/link ND Network Dependability NFIT Network Fault Insertion Test NFMECA Network Failure Modes, Effects and Criticality Analysis OAMP Operations, Administration, Maintenance, and Provisioning OSI Open System Interconnection

QoS Quality of Service RBD Reliability Block Diagram
SLB Service Logic Block 4 Overview of network dependability methodology

Need for network dependability methods 4.1A communication network is a system of systems that interacts with other networks to achieve multiple service performance objectives. A communication network is complex and its constituent systems are constantly changing and evolving. Appropriate methodology and technical approaches are needed for dependability assessment and assurance of the network. From a network dependability assessment perspective, the classical dependability techniques for analysis and evaluation have a limited scope in network application. Existing dependability methods are often unsuitable for modelling complex network topology and difficult for analysis of multiple network configurations and network service paths to provide confidence in the evaluation results. Selective methods such as SLB, NFMECA, and network simulation suitable for network dependability analysis and evaluation can provide effective network solutions. SIST EN 62673:2014

– 12 – 62673  IEC:2013 They have become the essential processes to ensure sustainable network services and dependability performance. A common approach for assurance of network dependability performance and dependability of service is to construct reliable network structure, establish effective routing schemes, provide efficient fault management and network maintenance support, and gather performance data and user feedback for network service evaluation and improvement. The process involves analysis of network service functions for cost-effective implementation, and evaluates value-added network service features for dependability of service enhancement. This approach, though adequate for system life cycle assessment of hardware and software network elements to ascertain dependability performance, is inadequate to deal with routing connectivity of user services in network operation. The traditional assurance approach lacks the responsiveness to react to the market dynamics of adaptive network configurations. This affects the network service objectives to ensure network dependability performance and to guarantee dependability of service in a highl

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