Abstract. We propose three routing strategies for the routing and wavelength assignment (RWA) of scheduled and random lightpath demands in a wavelength-switching mesh network without wavelength conversion functionality. Scheduled lightpath demands (SLDs) are connection demands for which the set-up and tear-down times are known in advance as opposed to random lightpath demands (RLDs) which are dynamically established and released in response to a random pattern of requests. The routing strategies are studied and compared through rejection ratio.