1. A method of configuring a wavelength division multiplexed (WDM) network, the WDM network including a plurality of circuits, each of which carrying one of a plurality of optical signals, each of the plurality of optical signals having a corresponding one of a plurality of wavelengths, the WDM network including a plurality of nodes and a plurality of links connecting the plurality of nodes to one another, each of the plurality of circuits including at least one of the plurality of links and at least one of the plurality of nodes, the method comprising: assigning each of the plurality of circuits one of the plurality of optical signals, based on first and second criteria; and configuring the plurality of nodes based on the assigning each of the plurality of circuits one of the plurality of optical signals.