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We conhder the WDM-routed networks with sparse and limited conversion capacity. After building the framework for dynamically setting up lightpaths, we propose a request packet format embedded in signaling protocols to collect routes' status ou the fly. We define the lambda states: busy; free and coutinuous from the previous link; free hut not continuous from the previous link. These states could be completely coded by 2 bits and updated into the proposed request packet, providing full information picture of routes. By manipulating the collected information, a powerful wavelength assignment can be triggered, which provides enhancements for network performances. Analysis and simulation results show that our proposals outperform those of previous works in terms of blocking performance and complexity-. Indm terms -Routing and Wavelength Assignment (RWA), Wavelength Division Multiplexing (WDM), lightpath setup.