Service level agreement and provisioning in optical networks

Fawaz, Wissam; Daheb, Belkacem; Audouin, O.; Du-Pond, Michel; Pujolle, Guy

doi:10.1109/mcom.2004.1262160

Cited by 132 publications

(85 citation statements)

References 3 publications

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“…As such, the availability required by high-priority connections is not respected, despite the use of a BP. Specifically, according to [7], a gold client requests an availability of 99.999 percent. This availability is never achieved with the classical scheme.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Indeed, the choice of M 1 depends mainly on the availability required by high-priority connections. For instance, according to [7], a gold client requests an availability of 99.999 percent. In this case, a value of M 1 ¼ 2 is sufficient to obtain such availability and to respect at the same time the availability required by silver clients (that is, 99.99 percent according to [7]).…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Moreover, the authors in [6] limited their study to only two classes of service, whereas the majority of the standards deal with multiple (that is, more than two) classes of service. Generally, four classes of service can be identified (premium, gold, silver, and bronze), and according to the customer profiles' and the provided service, a finer classification can be achieved [7]. As our first main contribution, we therefore derive the reliability parameters associated to the 1 : N protection scheme for multiple classes of service with different path availabilities.…”

Section: Introductionmentioning

confidence: 99%

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Introducing a Relative Priority for the Shared-Protection Schemes

Bouabdallah¹,

Séricola²

2007

IEEE Trans. Dependable and Secure Comput.

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Abstract-One of the major challenges of optical network operators is ensuring the stringent levels of availability required by their highest class clients. To achieve this, we introduce relative priorities among the different primary connections contending for access to the shared-protection paths. In this paper, we provide an analytical model for the proposed priority-enabled scheme. As a key distinguishing feature from existing literature, we derive explicit analytic expressions for the average availability and service disruption rate for the different priority classes.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Introducing a Relative Priority for the Shared-Protection Schemes

Bouabdallah¹,

Séricola²

2007

IEEE Trans. Dependable and Secure Comput.

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show abstract

“…For the sake of simplicity, we consider a scenario consisting of 3 primary connections sharing one backup path.We first consider a priority-aware protection scheme, with one high-priority and two low-priority primary connections.The availability of each class is calculated for different connections' lengths based on equations (9) and (14), and is reported in Figure 3. Then, a classical shared protection scheme is applied to this scenario, and the availability of a connection is evaluated using equation (8). The corresponding results are reported again in Figure 3 for comparison purposes.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Usually, by means of service contracts called Service Level Agreements (SLA), a client subscribes to optical network services from the optical operator with a certain guaranteed QoS level. Within the SLA, Service Level Specifications (SLS) [8] quantify the quality of service provided to the customer. A certain number of SLSs indicate the reliability constraints needed by the subscribed service.…”

Section: Introductionmentioning

confidence: 99%

A Priority-Aware Protection Technique for Quality of Service Enabled WDM Networks

Fawaz

Martignon

Chen

et al. 2005

NETWORKING 2005. Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile A

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Abstract. Connection availability is considered as a critical metric, when providing differentiated services in WDM mesh networks. Indeed, one of the major concerns of optical network operators is related to improving the availability of services provided to their highest-class clients. Achieving this objective is possible through the use of the different classical protection schemes, namely the so-called dedicated and shared protection schemes. However, the majority of the work concerning protection schemes has considered the primary connections as equally important when contending for the use of the backup resources.As a main contribution in this paper, we therefore propose an improvement of the existing protection schemes through the introduction of relative priorities among the different primary connections contending for the access to the protection path. To evaluate numerically the benefits of the service differentiation feature introduced in our proposal, we first develop a mathematical model based on which we derive explicit expressions for the average connections availabilities that result from both the classical protection schemes and the proposed priority-aware one. Through this model, we show how the availability of the highest-class clients is improved when deploying the proposed priority-aware protection scheme.Finally, with the same objective in mind, we develop a simulation study, where a given set of connection demands with predefined availability requirements is provisioned, using different protection strategies. Through this study, we show that the priority-aware protection strategy satisfies service-availability requirements in a cost-effective manner compared with the classical protection schemes.

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SLA Driven Network Management

Aib¹,

Daheb²

2007

Management, Control and Evolution of IP Networks

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Service level agreement and provisioning in optical networks

Cited by 132 publications

References 3 publications

Introducing a Relative Priority for the Shared-Protection Schemes

Introducing a Relative Priority for the Shared-Protection Schemes

A Priority-Aware Protection Technique for Quality of Service Enabled WDM Networks

SLA Driven Network Management

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