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© 2010 Taylor & Francis Group, LLC
Preliminaries of SDN and OpenFlow
SDN [25] is a promising technique to lower the barrier for deploying
and managing new functionality, applications, and services in the net-
works. OpenFlow [26] was raised in 2008 by the Clean State Team of
Stanford University, and it has been the promising and popular tech-
nology to realize the SDN because of its ability to support the decou-
pling of the control plane and the data (forwarding) plane. OpenFlow
centralizes the control of the flow table in the switch devices to an
external programmable and flexible controller, and provides a secure
protocol to ...