Journal ArticleDOI
Lightpath restoration in WDM optical networks
Gurusamy Mohan,C. S. R Murthy +1 more
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This article discusses providing tolerance capability to the optical layer in WDM-based transport networks with a survey on restoration schemes available in the literature, explains the operation of these schemes, and discusses their performance.Abstract:
Optical networks employing wavelength-division multiplexing and wavelength routing are potential candidates for future wide area networks. Because these networks are prone to component failures and carry a large volume of traffic, maintaining a high level of service availability is an important issue. This article discusses providing tolerance capability to the optical layer in WDM-based transport networks. It presents a survey on restoration schemes available in the literature, explains the operation of these schemes, and discusses their performance.read more
Citations
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Journal ArticleDOI
Optical Network Survivability: Protection Techniques in the WDM Layer
TL;DR: All the main optical protection techniques proposed as far as now for the WDM layer are classified and reviewed and an example of heuristic network-capacity optimization is presented, discussing results obtained by considering a case-study network.
Proceedings ArticleDOI
Backup path allocation based on a correlated link failure probability model in overlay networks
TL;DR: The goal is to find a route for the backup path to minimize the joint path failure probability between the primary and the backup paths, and the results show that, in terms of robustness, the approach is near optimal and is up to 60% better than no backup path reservation
Journal ArticleDOI
Shared Risk Resource Group : Complexity and Approximability Issues
TL;DR: Cases where combinatorial optimization problems are polynomial are identified, for example when the edges of a given color form a connected subgraph, and otherwise hardness and non approximability results for these problems are identified.
Proceedings ArticleDOI
When the network crumbles: an empirical study of cloud network failures and their impact on services
Rahul Potharaju,Navendu Jain +1 more
TL;DR: This paper describes a large-scale study analyzing and correlating failure events over three years across multiple datacenters and thousands of network elements such as Access routers, Aggregation switches, Top-of-Rack switches, and long-haul links.
Journal ArticleDOI
Optical networking and real-time provisioning: an integrated vision for the next-generation Internet
TL;DR: This article considers the problem of real-time provisioning of optical channels in hybrid IP-centric DWDM-based networks, with a particular focus on the "routing and wavelength assignment" (RWA) problem.
References
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Proceedings ArticleDOI
Survivable WDM mesh networks. Part I-Protection
TL;DR: This study examines different approaches to protect mesh based WDM optical networks from single-link failures, and formulated integer linear programs to determine the capacity requirements for the above protection schemes for a static traffic demand.
Journal ArticleDOI
Optical network design and restoration
TL;DR: This paper reports test results for large carrier-scale networks that indicate that subsecond restoration, high capacity efficiency, and scalability can be achieved without fault isolation and with moderate processing.
Proceedings ArticleDOI
Survivable WDM mesh networks. II. Restoration
TL;DR: Numerical results obtained by simulating the distributed restoration protocols indicate that, for a representative network topology, path restoration has a better restoration efficiency than link restoration, and link restoration hasA better restoration time compared to path restoration.
Journal ArticleDOI
Analysis and design of resilient multifiber wavelength-routed optical transport networks
TL;DR: In this paper, an integer linear program (ILP) formulation is presented for the exact solution of the routing and wavelength allocation (RWA) problem, with minimal total number of fibers, F/sub T/(W).