(【Abstract】As the gateway between the local area network and the Internet, the campus egress network plays an important role in the design of the entire campus network, and the design of a campus egress network is directly related to the performance of the campus network. This paper will first describe the present and research background of today's network, analyze the faults of today's egress network, and then design and implement the park egress network through in-depth study of the network basic knowledge and advanced network technology necessary for the egress network.)