3: Managing unified policy. Since the forwarding plane of every OpenFlow-enabled network device can be managed by a single centralized SDN controller, IT operators can now do traffic shaping and policy control across the whole network. In these cases, the IT operators do not even need to know how that box implements SDN, or even whether the box is wired or wireless. This is achieved through the use of SDN applications that run on the SDN controller. Using OpenFlow, an application can set the QoS parameters for any flow and it does not matter if the devices are wired or wireless.
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