The urban area of the server can be a central control node switch and server node, the node switches and a server node can know the porttraffic information in real time. When the connection existed over between 2 of these devices, a connection can be selected according to the real-time traffic, real-time routing function to avoid network congestion and flow of the uneven distribution of resources. Similarly, node server can central control node switch can know the real-time node switch port flow information, therefore, the node switches can obtain the terminal flow control information from the server to the terminal node data transmission flow control.