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OpenFlow Feature Overview and Configuration Guide
OpenFlow is a network protocol closely associated with Software-Defined Networking(SDN). SDN is a network architecture that allows network administrators to control traffic from a centralized SDN controller. A characteristic of popular SDN scenarios is the decoupling of the network control function (control plane) from the forwarding function (data plane). OpenFlow is a protocol for the control plane (which is centralized on the SDN controller) to communicate with the data plane (which is distributed among the network nodes) in an SDN network.