一种基于移动代理的网络管理系统及性能分析

当前所用的网络管理系统大都属于集中式管理模式,因此,在性能、可扩展性、灵活性等方面具有很大的局限性.基于移动代理的网络管理是针对这些不足而提出的具有潜力的解决方案之一,但是要精确地判定在什么条件下移动代理比传统的客户/服务器模式更有效是比较困难的.为此,提出了一个定量模型,从理论上分析和比较了两种结构的流量和响应时间,并就移动代理和SNMP(simple network management protocol)的性能进行了模拟实验比较.理论和实验结果都表明,当被管理的网络设备数在一定范围内时,移动代理的性能比SNMP的性能要好;对于移动代理访问固定数量的设备后再返回到网络管理器这种方案,移动代理的性能有较大的提高.

Evaluating the Performance of a Network Management System Based on Mobile Agents

Currently, most network management systems are centralized and therefore, the management systems present severe limitations as far as performance, scalability, and flexibility are concerned. A potential approach to the problem is to equip the management system with MA (mobile agent) capabilities. But it is difficult to identify precisely under which conditions design exploiting mobile agent is preferable over a traditional one. In this paper, a quantitative model is presented to analyze the performance (traffic, response time) of mobile agent design paradigm against the traditional client-server architecture for network management. The mobile agent performance is compared with SNMP (simple network management protocol) one in several simulations. Analysis and simulations results show that the mobile agent performs better than the SNMP when the number of managed network elements exceeds a value related to the overhead of several retrievalsof the SNMP. Moreover, a significant improvement of the mobile agent performance is obtained when the agent returns to the management station, after visiting a fixed number of noeds.