Abstract: In accordance with the present disclosure, a method of configuring a wavelength division multiplexed (WDM) network is presented. The WDM network includes circuits that carry optical signals, with each signal corresponding to a wavelength. The WDM network includes nodes, with links connecting the nodes to one another. Each circuit includes at least one link and at least one node. The method comprises assigning each of the circuits to an optical signal, based on first and second criteria, and configuring the nodes based on the assignment.

Abstract: In accordance with the present disclosure, a method of configuring a wavelength division multiplexed (WDM) network is presented. The WDM network includes circuits that carry optical signals, with each signal corresponding to a wavelength. The WDM network includes nodes, with links connecting the nodes to one another. Each circuit includes at least one link and at least one node. The method comprises assigning each of the circuits to an optical signal, based on first and second criteria, and configuring the nodes based on the assignment.

Abstract: A multicast network for multicast services, said network comprising a wide area network comprising core routers handling data traffic inside said wide area network and edge routers handling said data traffic between said core routers and clients to said wide area network, an overlay network comprising overlay core routers handling data traffic inside said overlay network and overlay edge routers handling said data traffic between said overlay core routers and clients to said overlay network, wherein the overlay core routers are highly interconnected, the overlay core routers are connected to the overlay edge routers with a limited number of links; the overlay core routers being collocated with the core routers, and the overlay edge routers being collocated with the edge routers.