Bandwidth guaranteed integrated routing and wavelength assignment algorithm in IP over WDM optical networks

Xu Su; Bin Wang; C. L. Philip Chen

doi:10.1117/12.475300

3 July 2002 Bandwidth guaranteed integrated routing and wavelength assignment algorithm in IP over WDM optical networks

Xu Su, Bin Wang, C. L. Philip Chen

Proceedings Volume 4874, OptiComm 2002: Optical Networking and Communications; (2002) https://doi.org/10.1117/12.475300
Event: ITCom 2002: The Convergence of Information Technologies and Communications, 2002, Boston, MA, United States

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.

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Xu Su, Bin Wang, and C. L. Philip Chen "Bandwidth guaranteed integrated routing and wavelength assignment algorithm in IP over WDM optical networks", Proc. SPIE 4874, OptiComm 2002: Optical Networking and Communications, (3 July 2002); https://doi.org/10.1117/12.475300

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KEYWORDS

Optical networks

Wavelength division multiplexing

Algorithm development

Computer simulations

Channel projecting optics

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