QoS control method based on OF-DiffServ model and QoS control system thereof

The invention discloses a QoS control method based on an OF-DiffServ model and a QoS control system thereof. The method comprises the steps that S1, each service flow entering an SDN is transmitted to a controller through the edge node of an OpenFlow switch; S2, all the service flows are classified through the controller and different priority and ToS values are set for different classes of service flows; S3, each service flow is put in the corresponding queue of its own priority; S4, the ToS value of each service flow is updated according to the network state information of the SDN, the ToS value updating rules and the QoS requirements of each service flow every hop for adjusting the priority of each service flow, and the process returns to perform the step S3. The beneficial effects of the QoS control method and the QoS control system are that the classes of the data flows can be adaptively adjusted according to the idle situation of the data flow and the queue of each port, the entered queue of the flows c