Core Technologies of Network Softwarization-SDN Load balacing Routing strategy Application plane Traffic monitoring Other applications SDN is a new type of network Northbound API paradigm that decouples the control plane from the data plane, Control plane SDN Control Software Network Services making the network switch a simple forwarding device,and Southbound API the control logic is implemented Switch Switch Switch in the controller. Data plane Switch Switch Fig 3 Software defined network architecture 8SDN is a new type of network paradigm that decouples the control plane from the data plane, making the network switch a simple forwarding device, and the control logic is implemented in the controller. Fig.3 Software defined network architecture Core Technologies of Network Softwarization-SDN Application plane Control plane Data plane Switch Switch Switch Switch Switch Northbound API Southbound API SDN Control Software Network Services Load balacing Traffic monitoring Routing strategy Other applications 8