FlowVisor, originally developed at Stanford University, has been widely used in experimental Research & Education networks to support slicing where multiple experimenters get their own isolated slice of the infrastructure and control it using their own network OS and a set of control and management applications. FlowVisor has been deployed on a Stanford production network and sponsors, such as GENI, Internet2, NEC and Ericsson, have been contributing to it and using it in their research labs. Stanford uses FlowVisor to support both production traffic and experimental research traffic on the same physical infrastructure by assigning a slice of the network to the production traffic and other slices to researchers’ traffic. Students have also used network slices to experiment with many interesting research ideas including network based load balancing, VM mobility, new approaches to routing and traffic engineering, mobility management across different types of wireless networks, and others. GENI also uses FlowVisor extensively at various campus sites and within backbone networks.