Construction of Distributed Network Management System for High speed and Large Scale Information Network

近年来，计算机网络以非常快的速度扩展，并且具有多样性。如何为用户管理网络成为一个重要的问题.本研究的重点是网络故障管理系统。本课题的研究目标是探索合适的管理信息采集方法，开发一个基本的网络故障管理系统，经过两年的研究和开发，提出了一种新的管理系统信息采集方法。该方法通过考虑网络带宽和拥塞情况对管理流量进行控制，适用于不同速率的网络。为了获得高质量的网络管理信息，我们还提出了称为快照的同步思想。利用这两种思想，在SNMP（Simple Network Management Protocol）平台上实现了故障的同步管理，同时减少了处理时间，并开发了一个故障管理原型系统。在该系统中，我们提出了分而治之的算法来检测网络中发生的故障。该算法采用事件驱动、动态症状隔离的方法。我们已经评估了该算法的性能，并研究了两种不同类型的网络上的各种操作参数的效果。与传统系统相比，采用分而治之机制的系统在降低管理成本的同时，显著提高了系统的性能。我们认为本研究的目的已经达到。

Computer networks expand in a very fast pace in recent year with diversity. How to manage the network for users becomes and important problem. In this research, we focus on the network fault management system. The target of this research is to search for the proper method of management information collection and develop a basic system of network fault management.By the two years research and development, we proposed a new method of information collection for management system. By controlling management traffic in considering of the bandwidth and congestion of network this method can be used on any networks with different speed. We also proposed the idea of synchronization called Snapshot for obtaining high quality network management information. By using this idea, not only the synchronized management can be obtained easily on a SNMP (Simple Network Management Protocol) platform, but also the processing time is reduced.By making use of this two idea, we developed a prototype of fault management system. In this system, we proposed divide and conquer algorithm for detecting faults occcurred in network. This algorithm used event-driven, dynamic symptom isolation method. We have evaluated the performance of this proposed algorithm and have examined the effect of the various operational parameters on two different kinds of networks. In comparison with the conventional system, the system with divide and conquer mechanism improved the performance significantly and at the same time reduced management cost. We consider that the purpose of this research have been achieved.