Extend And Implement Of 802.1X Protocol For Ethernet Switch

With the higher requirement of bandwidth and development of Ethernet technology, Ethernet technology is increasingly used for constructing the broadband network. This makes the traditional Ethernet technology which based on media-shared have to satisfy the business and manageable request. User authentication management is one of an important part.WEB, PPPOE and 802.1X authentication technologies are compared as user authentication technology, their disadvantages and advantages are analyzed in this thesis. 802.1X protocol is more suitable than others for Ethernet circumstance as user authentication management technology. The switch is the basic equipment in the construction of Ethernet. According to the requirement of user authentication management of switch, intend to solve the problems of port control, selection of authentication scheme, compatibleness of authentication server, accounting and security, 802.1X protocol is extended and modified. In order to improve the efficiency of 802.1X protocol on the switch, the cross-hash table and parallel communication between switch and authentication server are used.According to implement circumstance, in allusion to the problems of user date-structure define, receiving and sending messages, implement of state machine and support for other protocols, the resolvents are represented and implemented. A feasible software structure of 802.1X protocol is given in this thesis. The system has been implemented on a switch and it runs well. The authentication process is tested on a switch implementing the 802.1X protocol, the result is get. Finally, an Ethernet instance is given.