Shared path protection with differentiated reliability

Fumagalli, Andrea; Tacca, Marco; Unghváry, Ferenc; Faragó, András

doi:10.1109/icc.2002.997229

Cited by 50 publications

(29 citation statements)

References 6 publications

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“…Therefore, the above condition of independency translates in our case to the simple constraint that the working and the protection lightpaths must not be routed on WDM channels belonging to the same link, or, synthetically, it reduces to a link-disjoint routing condition for the w/p pair. 1 Given the absence of failure correlation implied by link-disjointness, the availability of the working and the protection lightpaths can be individually computed. Each of the two lightpaths is the series of its WDM channels.…”

Section: Availability Analysismentioning

confidence: 99%

“…Each of the two lightpaths is the series of its WDM channels. According to the approximate model adopted, the availability of the working lightpath is given by the following equation: (1) where indicates the th of the WDM channels composing the working lightpath.…”

Section: Availability Analysismentioning

confidence: 99%

“…The guarantees of a prefixed maximum outage time and a maximum connection-failure probability [1] for a connection become fundamental components of the service level agreement between an operator and its customers. Being an OTN system composed of reparable subsystems, quality is usually measured in terms of connection availability (a measure of outage time), rather than reliability (a measure of disconnection probability), though this second parameter could have its relevance [2].…”

Section: Introductionmentioning

confidence: 99%

“…Being an OTN system composed of reparable subsystems, quality is usually measured in terms of connection availability (a measure of outage time), rather than reliability (a measure of disconnection probability), though this second parameter could have its relevance [2]. Many authors have proposed various ad hoc reliability parameters to be employed to networking problems [1], [3]- [5]. In this paper, we will refer to availability defined according to classical reliability theory [6], [7].…”

Section: Introductionmentioning

confidence: 99%

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Availability design of optical transport networks

Tornatore

Maier²,

Pattavina

2005

IEEE J. Select. Areas Commun.

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Abstract-A design technique for reliable optical transport networks is presented. The network is first dimensioned in order to carry a given set of static protected optical connections, each one routed maximizing its availability. The network can be further optimized by minimizing the number of fibers to be installed, while keeping a control on connection availability, which can remain the same or decrease by a prefixed margin factor. Design and optimization algorithms are provided for networks adopting dedicated and shared path-protection. The optimization approach is heuristic. Results obtained by applying the proposed technique to two casestudy networks are shown and discussed. These two case-study experiments are carried out exploiting a realistic model to evaluate terrestrial and submarine optical link availability.Index Terms-Deterministic network calculus, mathematical programming/optimization, system design.

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Section: Availability Analysismentioning

confidence: 99%

Section: Availability Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Availability design of optical transport networks

Tornatore

Maier²,

Pattavina

2005

IEEE J. Select. Areas Commun.

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“…These resources are usually shared among several primary connections to improve the network utilization. Generally, the primary connections are considered as equally important when contending for the use of the backup resources [1], [2], [3]. However, this solution is unsuitable from the service perspective.…”

Section: Introductionmentioning

confidence: 99%

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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Integrated Dynamic Routing of LSPs in IP over WDM Networks: Full Protection and Partial Spatial-Protection

Qin

Gurusamy

2004

Lecture Notes in Computer Science

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Abstract. We investigate the problern of Label Switched Path (LSP) protection using online integrated routing in IP over WDM networks. While certain mission-and time-critical applications require guaranteed 100% protection, other applications may have less stringent protection requirements. We consider these two kinds of protection seenarios and refer them as full protection (FP) and partial protection (PP), respectively. We first consider the full protection scenario and develop two integrated routing algorithms to select primary LSPs and backup LSPs, respectively. Next we consider the partial protection scenario, particularly, the partial spatial-protection (PSP) wherein the working traffic is unprotected against the failure of certain links along the primary LSPs according to the specified connection protection requirements. We develop an algorithm to determine the set of unprotected links with the objective of improving the backup resource sharing efficiency. We evaluate the performance of the proposed algorithms on the NSFNET and Pan-European optical networks.

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Shared path protection with differentiated reliability

Cited by 50 publications

References 6 publications

Availability design of optical transport networks

Availability design of optical transport networks

Introducing a Relative Priority for the Shared-Protection Schemes

Integrated Dynamic Routing of LSPs in IP over WDM Networks: Full Protection and Partial Spatial-Protection

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