Software-defined overlay network data transmission system

The invention discloses a data transmission system of a software-defined cascading network, belongs to the technical field of network data transmission, and aims to solve the technical problems of difficulty in deployment of a traditional software-defined network and instability of data forwarding performance of an application. According to the technical scheme, the system is characterized in that a plurality of proxy servers and one or more controllers are deployed in a network, the proxy servers serve as relay nodes to forward data, and ports, used for forwarding the data, of the relay nodes are automatically appointed and notified to the controllers; the controller is used for managing and maintaining the software-defined cascading network and calculating a data forwarding path; wherein a link exists between any two different relay nodes; and the software-defined overlay network utilizes the rented logic link with the fixed network bandwidth. 本发明公开了一种软件定义层叠网数据传输系统，属于网络数据传输技术领域，本发明要解决的技术问题为如何克服传统软件定义网络部署难以及