Software Defined Networking (SDN) is a new network architecture and network management method. In a traditional network, network devices (such as switches and routers) are responsible for data transmission and control plane processing. Network administrators need to configure these devices one by one, which makes the control and management of the entire network complicated and rigid. SDN separates the control plane and data plane of the network so that the network control logic can be abstracted from the physical device and centralized in a centralized software called controller for management and configuration.