Enhancing survivability of inter-datacenter networks using cross-layer approaches

In this paper, we consider network design principles for highly reliable datacenter interconnection in multilayer optical and packet transport networks. To address a wide range of traffic demands while ensuring high reliability, it is crucial to effectively integrate packet-layer switching and opticallayer transmission technologies for datacenter interconnection. However, few literature has investigated the applicability of the packet layer and optical layer with respect to network survivability. In this paper, we investigate the applicability of cross-layer approaches to enhance network survivability while avoiding the increase in network cost, and also present methods for availability analysis. To clarify the applicability and effectiveness of the proposed approaches, we conducted extensive numerical experiments. When the average traffic demand exceeds approximately 150 Gbps, a direct optical connectivity approach among distant datacenters offers improved performance in terms of availability and network cost. Conversely, when traffic demand is relatively small, a cross-layer approach that integrates packet switching with optical transmission technologies can efficiently reduce network cost by improving the efficiency of optical network resources through packet multiplexing.