Abstract

The architecture of next-generation high-speed networks will likely consist of IP and WDM layers. The IP layer runs packet switching, whereas the WDM layer uses circuit switching. Although the two share the goal of efficient use of network resources, there is a lack harmony between the two approaches, owing to different traffic-engineering capabilities. To this end, we introduce a combined approach for quantitatively analyzing the effectiveness of traffic engineering for the two layers. First, we model an edge router and devise a traffic-engineering mechanism to minimize the combined cost over a single path. We show that both the explicit price, which characterizes the traffic-engineering cost, and the implicit price, which determines the network congestion cost, play a key role in wavelength allocation. We consider wavelength granularity, which significantly affects overall performance when the number of wavelengths in a link is small. To solve this granularity problem, we propose an approximation algorithm that finds an integer solution from the real solution. Through simulations, we verify that our proposed algorithm achieves near-optimal performance with greatly reduced complexity and ensures the feasibility of our proposed solutions.

© 2004 Optical Society of America

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