Ramon Casellas, Ricard Vilalta, Ricardo Martınez, and Raul Münoz from the Centre Tecnologic de Telecomunicacions de Catalunya (CTTC) have demonstrated, by concept and experimental implementation, a novel highly efficient SDN/NFV-based control architecture that meets several basic carrier-grade requirements of telecommunication operators. In this context, it should be highlighted that the new control design applies vendor-interoperable standard protocols (PCEP, BGP-LS, OSPF-TE, GMPLS, OpenStack), which is a major prerequisite for carriers seeking an open vendor competition environment. The paper describes a solution for SDN use cases that incorporate different OSI layers. So, for instance, an automated multi-layer network resource optimization can be performed by taking into account the IP router layer as well as the optical fiber network with Wavelength-Division-Multiplex (WDM) and state-of-the-art Reconfigurable Optical Add-Drop Multiplexers (ROADM).
A significant achievement by the authors’ control platform design is its highly resilient architecture being an important requirement for network operators. The solution exhibits well-synchronized Path-Computation Element (PCE) replicas that can be organized in a self-healing distributed data center cloud environment. In addition to that, other SDN control instances, such as replica reflectors, can be duplicated and thus protected against system outages. Although such robust overall solutions are based on a highly meshed connectivity and corresponding control of overhead signaling between duplicated control entities, the experimental setup showed impressive results regarding scalability and performance.
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