(In the past 10 years, with the rapid development of broadband technology and multimedia use, the Internet has higher and higher requirements for high-performance routers. Unlike the previous routers based on bus structure, the current high-speed routers generally use fixed-length routers. Element switching structure to terminate agile packet forwarding. In this structure, the configuration of the switching structure is determined by the scheduler. Variable-length packets are first divided into fixed-length cells at the input port.)