中文摘要：

在大型网络中由于采用多种路由协议，必须开启路由器的重分发功能。但是路由重分发可能产生次优路径问题，为解决次优路径问题，通过对利用图形化网络环境模拟器GNS3建立的双向重分发模拟实验网络环境进行研究，分析管理距离值对多协议路由环境下路由选择的影响，设计了两种纠正次优路径的系统解决方案，方案一直接使用distance命令来修改某个协议的管理距离值；方案二利用访问控制列表针对某条路由精确地更改管理距离值，结果表明两种方案都能有效避免路由重分发中次优路径的产生。

英文摘要：

The route redistribution function is suggested to be started, because of running multiple routing protocols in large networks. However, the route redistribution may produce the trouble of the sub-optimal path. In order to solve the problem of sub-optimal path, in this study, a two-way redistribution simulation network environment with GNS3 （Graphical Network Simulator） is presented and the effect of the administrative distance on routing in multi-protocol routing environment is analyzed. Two solutions to correct sub-optimal path on the base of the above analysis are designed, which can also help to avoid the generation of sub-optimal path in route redistribution in the real network environment.