Recently, progress has been made in the Generalized Multi-Protocol Label Switching (GMPLS) standardization lets WDM (Wavelength Division Multiplexing) networks be interconnected. As known that the Autonomous System (AS)-level topologies of the current Internet are found to exhibit the power-law, large-scale WDM networks constructed by interconnecting local WDM networks will also exhibit the power-law attribute. In this paper, we propose a quasi-static lightpath configuration method to utilize the wavelength resources more effectively and to reduce blocking probability in such networks. We compared our method with one not using a pre-determined lightpath by computer simulation. The results show that our method reduces the blocking probabilities by more than 80.
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