Simulation Of 802.1X Based On 802.1Q & SNMP

As an important technology of Local Area Network (LAN), Ethernet technology has been developing very rapidly. From the original ten Megabytes sharable Ethernet to fast-speed (100 M) Ethernet and currently multi-gigabytes Ethernet. New standards from IEEE brings not only the full support on criterion but also the improvement on the Ethernet technology, endues it with virtues such as easy to use, low cost of price and high-speed etc. Ethernet has entered the domain of Metropolitan Area Network (MAN) and Wide Area Lan (WAN).The demand for networking management has been increasing alone with the continuous development of giga-bytes Ethernet technology. The proposal of AAA concept set up the goal of user management in Ethernet network. Different kinds of wide-band Ethernet access authentication technologies has emerged including PPPOE, VLAN+MAC/IP, WEB Portal etc. As a new method of Ethernet access authentication and control, 802.1X has been more and more widely accepted due to its absence of faults in the other methods. But because it is a relatively new standard, the availability of existing switch devices supporting 802. 1x function is very limited.This paper gives a very detailed analysis of PPPOE, VLAN+MAC/IP, WEB Portal technologies, then discusses the 802.1x's technical superiority to the other technologies. Based on the analysis, the paper puts forward the need for the simulation of 802.1X which is supported by limited amount of devices through using the 802.1Q and SNMP which are supported by almost all mainstream switch devices. The paper goes on introducing the working processes of 802.1q, snmp, 802.1x protocols and gives an idea of simulating the 802.1x access authentication mode by using VLAN dynamic-configuration and abnormality real-time handling as the main technologies employed. Next, the paper gives a design of a simulation model, its principle and working process, introduces a implemented experimentation system of simulation, describes the modules of the system and give the key technical details of theimplementation of every module. Finally, the paper compares the experiment systemwith 802.1x system on the aspects of function and performance, and gives the solutions of the problem found during the test of the experiment system.