Unified traffic engineering for IP over WDM networks

In this paper, we propose an objective function to evaluate the performance of IP over WDM networks and a traffic engineering method which considers both IP and WDM layers. Since WDM engineering and traffic engineering used in the IP layer have similar functional goals, both functions should be harmonized to improve the network performance. We formulate an integer optimization problem to describe the tradeoff relation between control functions of both layers and find the unique optimal solution. The proposed traffic engineering method tries to minimize the total cost of both IP and WDM layer. The performance of the proposed method is analyzed and evaluated through simulation.