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We present OpenVirteX, a network virtualization platform that enables operators to create and manage virtual Software Defined Networks (vSDNs). Tenants are free to specify the topology and addressing scheme of their vSDN, and run their own Network Operating System (NOS) to control it. Since OpenVirteX logically decouples vSDNs from the infrastructure, it also enables the introduction of features such as link and switch resiliency, and network snapshotting and migration of these tenant networks. OpenVirteX builds on the design of FlowVisor, and functions as an OpenFlow controller proxy between an operator's network and the tenants' network OSes. Our evaluations of this implementation show that i) OpenVirteX is capable of presenting tenants with configurable vSDNs while incurring a modest overhead to the control channel, and ii) that our architecture enables the introduction of features and enhancements …