—The virtualization of SDN networks boosts flexibility in communication networks further by combining the programmability of SDN with the flexible sharing of the infrastructure due to network virtualization. The main element to realize this combination is the SDN network hypervisor interacting on the control traffic between tenant SDN controllers and the shared physical infrastructure. We outline the current challenges of designing an SDN hypervisor, and we present updates on HyperFLEX, a reliable and flexible SDN hypervisor, which targets at solving the existing challenges. Furthermore, we provide a short outlook into future research directions, such as providing switch diversity abstraction and precise estimation of control plane resources that are needed to realize a flexible and efficient virtualization of SDN networks.

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