在使用Mininet测试各种基础网络的时候出现以下错误：
Exception: Please shut down the controller which is running on port 6633:
原因：因为在退出mininet的时候是使用ctrl-c退出的，所以导致controller没有被正常杀死，所以导致6633端口一直被占用。
解决办法：
执行以下任意一个命令即可：
(1) sudo killall ovs-controller
(2) sudo mn -c
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