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张，具有多样性。如何为用户管理网络成为一个重要的问题。在本研究中，我们重点研究了网络故障管理系统。本研究的目的是寻求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信息采集方法。该方法通过考虑网络的带宽和拥塞来控制管理流量，可以适用于任何不同速率的网络。为了获取高质量的网管信息，我们还提出了一种称为快照的同步思想。利用这两种思想，不仅可以方便地在简单网络管理协议(SNMP)平台上实现同步管理，而且可以减少处理时间，并开发了一个故障管理系统原型。在该系统中，我们提出了一种用于检测网络故障的分治算法。该算法采用事件驱动、动态症状隔离的方法。我们评估了该算法的性能，并考察了不同的操作参数对两种不同类型网络的影响。与传统的系统相比，采用分治机制的系统在显著提高系统性能的同时，降低了管理成本。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.