With the increase of users and the popularization of the internet, the needs of users have changed, business needs have become more and more complex, and conventional network architecture has become increasingly unable to meet the needs of both users and businesses. International research organizations and individuals have launched the research on the new network architecture. SDN also emerged at this time. As a new network innovation architecture scheme, SDN has burned a research boom in the industry since its birth. Software-defined networking (SDN) separates the control plane from the data forwarding plane, which is presented as a new kind of architecture of networking control and management.