Design And Implementation On Method Of Topology Discovering And Network Flow View For Local Area Network

This paper analyses the problems about IP network management such as little methods to process alarm messages, lack of abilities to automatic processing and solutions for LANs management, and points out one of the main cause of them is the lack of automated solutions for discovering the network topology. According to the network protocols used in topology discovery algorithms, we categorize them into three classes. They are topology discovery algorithms based on SNMP, base on primitive protocols (such as ICMP, TCP/IP) and based on routing protocols. We compare and analyse their characteristics and advantages and disadvantages. Under the current campus network characteristics, we will use SNMP-based Topology Discovery algorithm automaticly for finding compus network topology. We use the graph's BFS to implement discovery of compus network topology automatically. We describe an algorithm and implement the method of it under VC++.NET development environment.This paper discusses the key issues of topology discovery automatically, topology mapping of network flow statistics. We explained the SNMP-related knowledge, the MIB database structure and access methods. We introduced the characteristics and advantages of SNMP++ process development kits. Development using SNMP network management procedures are simple and efficient, so we have to do systems development, using SNMP development toolkit. Using VC + + as a development environment, we developed a topology discovery and flow monitoring system. Use it in the school campus network, we have the right to draw the campus network topology.At last, we design and implement a general-purpose aucomatic topology discovery system in computer network using the three topology discovery algorithms and the topology updating algorithm. Many test cases have proved that the system can work well in a heterogeneous network. And the correctness of the three algorithms for topology discovery and the one for topology updating has been proved by some test cases.We tested the system, proved that the system can adapt to the campus network environment. We verified the accuracy of the results found in the system; In this paper, the proposed algorithm is effective. The algorithm is higher efficiency and practicality than other similar algorithm.