The CERNET scale of construction continues to expand, universities and secondary schools in succession through CERNET access the Internet. CERNET-sharing traffic costs for vast majority of schools, in addition, the user also need to pay the substantial costs of the DDN lines, and network systems operation and maintenance. Therefore, the billing system is to guarantee normal operation of the campus network. IEEE 802.1x protocol has complete user authentication and management capabilities to support broadband networks, billing, security, operations and management. 802.1x authentication mode and authentication architecture are optimized to solve the problems brought about by the traditional PPPoE and Web/Portal. The authentication method has a great advantage of broadband IP MAN, carrier-grade network operations and management, and is more suitable for the use in broadband Ethernet.