Design And Implementation Of Intranet Network Management System

With the development of social information, computer network has been the important foundation of enterprise and society. There are many enterprises have been established their own local network. The requirements of network management in different companies are different. Common network management systems usually cannot fulfill all of the requirements. In this paper, the writer has analyzed the requirements of network management in CERNET Eastern China(north) Regional Center(NENC) Intranet, and has given a detail of network management system for that intranet and introduce the implementation of the pivotal part of the network management system..Chapter1 firstly analyzed the characteristics and management states of middle and small enterprise intranet, and then introduced the related protocol and technology of network management.Chapter2 firstly introduced management requirement of NENC intranet. Corresponding to the requirement, the NMS was divided into four modules, including active node management, user PC management, network performance management and NMS system configure.Chapter2 secondly analyzes the characteristics of each module and gives out a NMS design based on observer architecture with polling as its main operation and listening as its assistant operation. In that design the common problem of different management functions are solved in the same level.Chapter3 analyzed the disadvantages of WinSNMP, including that WinSNMP can't return the SNMP packet buffer, can't get the error status in time and can't automatically deal with a large number of fetching variables. Corresponding to the disadvantages the Chapter3 gives out a new design of SNMP API, and analyzes the new SNMP API's efficiency in .NET Framework. The analyzing result proved that the SNMP API could effectively reduce the count of garbage collection as it allocs buffer on unmanaged heap.Chapter4 firstly analyzed the advantages and disadvantages of two different method of network level topology discovery, the one uses ICMP protocol and traceroute tool, the other uses SNMP protocol to access ipRouteTable in routers. Then the Chapter introduces the common idea of link layer discover based on the dot1dTpFdbTable in switches and gives out an algorithm. As the switches in NENC intranet support STP protocol, the Chapter also gives out an algorithm use STP to discover the interconnection of switches.The analyzing result proves that the algorithm using STP is more effective than the algorithm only using dot1dTpFdbTable.The chapter also study the problem of discovering the dummy equipments in a subnet.The chapter then analyzed the main problem in of address management in intranet and gives out a method based on SNMP and dot1dTpFdbTable in switches to solve that problem. Finally Chapter4 introduces the design of the polling and the integration of different parts of the NMS.Chapter5 mainly introduced the design and implementation of the framework of the NMS and the key functions...