【摘要】 介绍了移动代理的几个基本概念和相关的实现技术 ,针对传统的客户 /服务器模式的网络管理模型的缺陷 ,提出了一种引入移动代理的网络管理模型 ,给出了支持网络管理的移动代理系统的逻辑结构 .给出了一个原型系统 ,并就原型系统的安全性设计和性能方面进行了讨论 ,可以看出现有的网络管理模型和移动代理分别有自己的应用场合 ,实时性的、处理频繁的、或者数据量大的管理任务适合采用移动代理来实现 ,而另一些常规的管理任务仍然需要采用SNMP或CMIP协议来完成 .更多还原

【Abstract】 Conventional network management, such as SNMP and CMIP, adopts a centralized, client server model. In this model agent has little intelligence, while manager does almost all the work. This may lead a lot of vital problems. Mobile agent is an autonomic program, which can hang up its execution, collect its runtime state messages, transfer itself and its state to another network node, and then resume its execution there. Apply mobile agent concept to network management is a novel idea, which can greatly improve the robustness and distribution of a network management system. In this paper, an actual network management architecture based on mobile agent is proposed. Nowadays there are few network devices which can support mobile agent directly, though some ones have already began to appear. In order to enable mobile agents manage a network, a workstation (maybe a PC) can be added into the network. This special machine can accept mobile agents from a remote manage station, then these mobile agents can do their work like SNMP or CMIP managers. This method is very useful when a manage station is connected with the managed network using a low, expensive, or unreliable link. Even the connection between the manage station and the managed network is lost, mobile agents can still manage the network. The structure of the added workstation can be divided into three layers. The lowest layer is operating system layer, which supply low communication services to higher layers. The middle layer includes mobile agent server and/or SNMP/CMIP server. The mobile agent server can supply three kinds of services to mobile agents: ①monitor and administer the state of mobile agents;② migration support; ③ high communication between mobile agents. The highest layer is mobile agent layer. This layer includes some service agents. The immigrated agents can achieve their works through communicating with these service agents. According to the proposed model, a prototype system has been constructed through integrating Agent TCL, which is a mobile agent system developed by Dartmouth university, and Solstice TMNscript, which is a network management system developed by Sun company. In order to contrast to SNMP/CMIP, a simple performance analysis has been made. This analysis shows that mobile agent is suit for those management tasks which need transferring a large amount of data, or run frequently, while SNMP/CMIP is suit for small, ordinary management tasks.更多还原