实验环境：GNS3，c2691路由器
开始先把三台路由器接口的ip地址全部配好。因为都是重复的基础操作，如图。<img src="https://cache.yisu.com/upload/information/20200309/33/53406.jpg" alt="mark" style="zoom:75%;" />
<img src="https://cache.yisu.com/upload/information/20200309/33/53407.jpg" alt="mark" style="zoom:75%;" />
<img src="https://cache.yisu.com/upload/information/20200309/33/53408.jpg" alt="mark" style="zoom:75%;" />
端口ip配置好了，然后配置loopback。配置如图。
<img src="https://cache.yisu.com/upload/information/20200309/33/53409.jpg" alt="mark" style="zoom:75%;" />
<img src="https://cache.yisu.com/upload/information/20200309/33/53410.jpg" alt="mark" style="zoom:75%;" />
<img src="https://cache.yisu.com/upload/information/20200309/33/53411.jpg" alt="mark" style="zoom:75%;" />
接下来配置ospf协议，操作如图。<img src="https://cache.yisu.com/upload/information/20200309/33/53412.jpg" alt="mark" style="zoom:75%;" />
<img src="https://cache.yisu.com/upload/information/20200309/33/53413.jpg" alt="mark" style="zoom:75%;" />
试验到此结束，可以尝试去ping主机。应该可以成功。pc机ip自行设置。over！
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