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To get better wavelength channel utilization, rerouting can be used. During the course of rerouting, throughput will be low down or even zero. Wavelength rerouting has two works the lightpath migration and rerouting algorithm. The former deals with the migration of lightpath. It is advantageous that a rerouting operation incurs shortest disruption time and makes switching manage at the routing nodes simpler. The later, determines the lightpaths can be rerouted and selects a few among them to create a wavelength continuous route to satisfy a connection request. It is advantageous that a rerouting algorithm be simple, run in polynomial time and minimize the number of existing lightpaths required to be rerouted.
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