Design and Implementation of Virtual Topology Management for Multi-tenant OpenFlow Hypervisor

Multi-tenancy is an important feature for data centers and cloud infrastructures. In the early stage of those infrastructures, only a host or virtual server is rented to customers. Recently, companies, governments, and universities have located their servers on virtualized local networks defined by the provider or users. OpenFlow, a core technology of software-defined networking (SDN), is useful to centrally manage and control those virtualized networks; however, SDN technology is used only at the management level, not at the user level. In this paper, we propose a verification-based virtualization system for multiple tenantsf OpenFlow networks. It enables virtual network users that are administrators of the tenantfs network to use OpenFlow technologies to control their network traffic. Our system provides a practical scheme to create virtual network topology that is the target of control for the tenantfs OpenFlow controller. It manages the collisions of each tenantfs address space and isolates them by resolving the conflicts of flow entries that came from the tenantfs OpenFlow controller.