SDN (Software Defined Network), using OpenFlow as its core technology, separates the control plane of network equipment from the data plane, and separates network control from physical network topology, thus eliminating the restriction of hardware on the network architecture. SDN controller implements unified management and centralized control, reduces the difficulty of network maintenance, shortens the network deployment period, and reduces operation costs.
SDN changes the traditional silo architecture in which applications are closely coupled with networks, and improves the level of network resource pooling. Network service automation is achieved through software replacing manual orchestration. In addition, SDN provides open programmable interfaces to facilitate third-party applications to quickly implement new network functions, accelerating service innovation.