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Multicast communication in Wavelength Division Multiplexed (WDM) networks is traditionally supported by the assumption that the optical cross-connects are multicast capable, i.e., they are capable of switching an incoming signal to more than one output interface. A na?ve method of supporting this functionality in a Multicast-Incapable (MI) environment is by creating a virtual topology consisting of light-paths from the multicast source to each destination of the multicast session. For large sets of multicast requests, however, the network bandwidth consumed by such a scheme may become unacceptable due to the unicasting nature of the light-paths.
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