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Proceedings Paper

Bandwidth guaranteed integrated routing and wavelength assignment algorithm in IP over WDM optical networks
Author(s): Xu Su; Bin Wang; C. L. Philip Chen
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Paper Abstract

In this paper, we have developed an integrated online algorithm for dynamically routing bandwidth guaranteed label switched paths (LSPs) in IP over WDM optical networks. Traditionally, routing at upper layer (e.g., IP layer) is independent of wavelength routing at the optical layer. Wavelength routing at the optical layer sets up a quasi-static logical topology which is then used at the IP layer for IP routing. The coarse-grain wavelength channels and the pre-determined virtual topologies with respect to some {\it a priori} assumed traffic distribution are barriers to efficient resource use and inflexible to changing traffic. We take into count the combined knowledge of resource and topology information in both IP and optical layers. With this added knowledge, an integrated routing approach can extract better network efficiencies, be more robust to changing traffic patterns at the IP layer than schemes that either use dynamic routing information at the IP layer or use a static wavelength topology only. Our proposed algorithm considers not only the importance of critical links, but also their relative importance to routing possible future LSP set-up requests by characterizing their normalized bandwidth contribution to routing future LSP requests. Moreover, link residual bandwidth information that captures the link's capability of routing future LSPs is also incorporated into our algorithm. Simulation results show that our proposed algorithm performs better than both routing algorithms do in terms of LSP set-up request rejection rate and available bandwidths.

Paper Details

Date Published: 3 July 2002
PDF: 12 pages
Proc. SPIE 4874, OptiComm 2002: Optical Networking and Communications, (3 July 2002); doi: 10.1117/12.475300
Show Author Affiliations
Xu Su, Wright State Univ. (United States)
Bin Wang, Wright State Univ. (United States)
C. L. Philip Chen, Wright State Univ. (United States)

Published in SPIE Proceedings Vol. 4874:
OptiComm 2002: Optical Networking and Communications
Nasir Ghani; Krishna M. Sivalingam, Editor(s)

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