# 指定交换机跟控制器类型

通过 `--switch` 选项跟 `--controller` 选项可以分别指定采用哪种类型的交换机跟控制器。

例如使用用户态的交换机：

```
sudo mn --switch user
```

使用 OpenvSwitch：

```
sudo mn --switch ovsk
```

使用 NOX pyswitch：

* 首先确保 NOX 运行

  ```
  cd $NOX_CORE_DIR
  ./nox_core -v -i ptcp:
  ```

  然后 `Ctrl-c` 杀死 NOX 进程
* 然后指定 NOX 交换机

  ```
  sudo -E mn --controller nox_pysw
  ```

注意：通过`-E`选项来保持预定义的环境变量（此处为 `NOX_CORE_DIR`）。


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