> For the complete documentation index, see [llms.txt](https://yeasy.gitbook.io/mininet_book/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yeasy.gitbook.io/mininet_book/runtime_and_example/mn.md).

# mn

该脚本定义了一个 MininetRunner 类，用来表示模拟网络的主程序。

主要过程是创建一个 MininetRunner() 实例，依次解析传入参数，进行初始化后开启网络。

整体过程如下图所示。

![mn 脚本主要过程](/files/-M5xU5oxXlbkaYGOUkqn)

其中 Mininet 类的 start() 方法是核心的启动过程，主要包括调用 build 方法来根据拓扑创建网络、控制器、交换机、主机和连接等。之后依次启动控制器和交换机进程。 在执行完 start() 之后，通过 test 参数来判断 mininet 运行的模式。

```
if test == 'none':
            pass
        elif test == 'all':
            mn.start()
            mn.ping()
            mn.iperf()
        elif test == 'cli':
            CLI( mn )
        elif test != 'build':
            getattr( mn, test )()
```

默认情况下，参数为 cli，即进入到控制台模式，允许用户自己输入对 Mininet 的操作命令。 最终执行 mininet.stop() 进行删除资源的工作。


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