Abstract: With the rapid development of the Internet, there are a series of problems in the normal operation of the network systems, and the most prominent problem is network congestion caused by the overload traffic. hhe author studied a variety of flow control methods, and by the way of priority-based dueuing scheduling, the author used the OPNET network simulation software to simulate the three kinds of designed flow control mechanisms, finally solved the problems of the higher priority data flow not getting a timely response and the fairness issues in Ethernet.

Key words: Flow control, Queuing scheduling, Strict priority(SP) , Weighted round robin(WRR) , OPNET