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Proceedings Paper

Dynamic subsecond restoration on WDM transport networks
Author(s): Rajesh Jagannathan; Sridhar Alagar; Mathieu Garnot; Francesco B. Masetti; S. Venkatesan
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Paper Abstract

Developing an efficient restoration strategy assumes a greater significance in a WDM backbone than a conventional WAN backbone due to the fact that a single link carries an enormous amount of bandwidth. This paper provides a summary of results of our spare capacity planning and restoration schemes on Pan-American and Pan-European networks. The spare capacity planning for both path and link based restoration are considered and their costs compared. Distributed and centralized restoration schemes, which have no preplanning and no a priori knowledge of the network capacities, are simulated on these networks for single link failures. Both link and path restorations are considered. We compare the restoration times of the various scenarios (centralized- link, distributed-link, centralized-path, distributed-path restorations) that arise in these two networks and show that our algorithms were able to achieve 100% restoration under a second for the networks considered. Our results show that centralized restoration can be faster than distributed restoration. This is against the common belief that distributed restoration is faster than the centralized restoration. We also analyze why this happens and the conditions (traffic matrix) under which the distributed restoration may be faster than the centralized. Additionally, we show that a centralized link restoration is always faster than a distributed link restoration.

Paper Details

Date Published: 7 October 1998
PDF: 8 pages
Proc. SPIE 3531, All-Optical Networking: Architecture, Control, and Management Issues, (7 October 1998); doi: 10.1117/12.327083
Show Author Affiliations
Rajesh Jagannathan, Alcatel Alsthom Corporate Research Ctr. (United States)
Sridhar Alagar, Alcatel Alsthom Corporate Research Ctr. (United States)
Mathieu Garnot, Alcatel Corporate Research Ctr. (France)
Francesco B. Masetti, Alcatel Alsthom Corporate Research Ctr. (France)
S. Venkatesan, Univ. of Texas at Dallas (United States)

Published in SPIE Proceedings Vol. 3531:
All-Optical Networking: Architecture, Control, and Management Issues
John M. Senior; Chunming Qiao, Editor(s)

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