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Proceedings Paper

Proposal for procedures to reconfigure logical topologies in reliable WDM-based mesh networks
Author(s): Shinya Ishida; Shin'ichi Arakawa; Masayuki Murata
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Paper Abstract

A Wavelength Division Multiplexing (WDM) network offers a flexible networking infrastructure by assigning the route and wavelength of optical transparent channels (also known as lightpaths). We can construct an optimal logical topology, by properly setting up the lightpaths. Furthermore, setting up a backup lightpath for each lightpath improves network reliability, i.e., tolerance against failures of network components. Most studies on methods to design a logical topology provide optimization formulations (e.g., Mixed Integer Linear Problem) and their solutions under the assumption that the traffic requirements are known in advance. In practice, traffic demand changes due to new services. When it does, a new optimal (or sub-optimal) topology should be obtained by again applying the formulation. Then, we can reconfigure the running topology to the logical topology obtained. However, during this reconfiguration, traffic loss may occur due to the deletion of older lightpaths. In this paper, we consider reconfiguring the logical topology in reliable WDM-based mesh networks, and we propose five procedures that can be used to reconfigure a running lightpath to a new one. Applying the procedures one by one produces a new logical topology. The procedures mainly focus on utilizing free wavelength resources and the resources of backup lightpaths, which are not used usually for transporting traffic. The results of computer simulations indicate that the traffic loss is remarkably reduced (in the worst case, more than 50% reduction in traffic loss) in the 14-node network we used as an example.

Paper Details

Date Published: 9 September 2002
PDF: 11 pages
Proc. SPIE 4910, Optical Networking II, (9 September 2002); doi: 10.1117/12.482427
Show Author Affiliations
Shinya Ishida, Osaka Univ. (Japan)
Shin'ichi Arakawa, Osaka Univ. (Japan)
Masayuki Murata, Osaka Univ. (Japan)

Published in SPIE Proceedings Vol. 4910:
Optical Networking II
Shizhong Xie; Chunming Qiao; Yun Chur Chung, Editor(s)

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