Optimal multilayer grooming-oriented design for inter-ring traffic protection in DNI multiring WDM networks

We propose optimal approaches to integrating traffic grooming and the protection strategies of virtual ring (VR) and drop and continue (DC) in dual-node interconnection (DNI) multiring translucent networks. A multilayer design matches the optimal solutions from the electronic layer to the physical topology available using a particular DNI-routing-and-wavelength-assignment formulation. Study cases with 20 different traffic matrices are performed over translucent and opaque networks with 13 nodes. Despite the excessive traffic duplication of the VR, there is only a minor distinction from the DC performance, even under heavy intra-ring traffic, thanks to an optimally chosen intra-ring lightpath in translucent networks.