Research And Implementation Of SNMP-Based Network Fault Management System

With the development of computer and communication technology, computer network is rapidly developed too. On one hand, network has already been closely related to people's study, work and life. On the other hand, it is stepping into a more complex way. So keeping network normal and reliable is very important. This depends not only on the dependability of network device itself and original design, but also on fault management, one of five major functions of network management. The quality of its management influences the running quality of network directly. Therefore, we should observe fault management function at a certain level. How to plan, realize and deploy it to get expected effection in a simple way becomes the main content studied. Because in the past, network builder have the consciousness of emphasising hardware and despising software, and the third-party management software has problems such as high price, need of better technical staff. All of this casuse the situation that many administrators only strictly manage device, circuit and user, but use network management software provided by device manufactory to the whole network. This is not reliable and not scientific to network of today, so we need an intelligent and simplified fault management system to solve this problem. This thesis takes fault management of medium and small-scale campus as its goal, and studies the composition and realization of fault management system based on SNMP. At first, it introduces the five function domains of network management, explains the framework and architecture of OSI network management, which establishes theoretics foundation for later practice. Then, begins with the overview of Simple Network Management Protocol, researches the composition and mechanism of SNMP, summarizes various kinds of network management skills, and shows us the design principle and development approach of the system. Then, this paper gives samples to applications of processing troubleshooting based on SNMP. After the introduction of classification to troubleshooting system and means of fault eliminating, we can clearly know the flow of troubleshooting. Then, combining with my working experience, associates SNMP MIB with fault, and explains how to solve trouble using their relationships with some cases. This thesis also gives the module divisions and practice of the system. According to the hierachical tree-architecture, the web-based four-layer fault management system is designed and partly implemented. There is a data collection subsystem based on domain management agent, which isolates applications from managed device. Database provides data support for the upper applications, and receives all kinds of packets from domain agents. Client management interface and browser interface give differenet level administrator different system entrance, ensuring the security. At last, it implements MIB browser tool using VC++ 6.0, which proved to be correct. Furthermore, this paper does something about intelligent and simplified network fault management system, and still has some deficiency to be improved. Finally, it studies the network management tendencies, and raises a plan of implementing a highly intelligent system in the future.