任务 9：将所有设备都恢复到出厂设置
步骤 1：在所有路由器上（R1、R2、R3)，实施以下操作
RX#erase startup-config Erasing the nvram filesystem will remove all configuration files! Continue? [confirm] [OK] Erase of nvram: complete Router#reload System configuration has been modified. Save? [yes/no]: no Proceed with reload? [confirm]
步骤 2：待路由器重启后，要看到一下提示，说明路由器已经恢复到出厂设置
--- System Configuration Dialog --- Would you like to enter the initial configuration dialog? [yes/no]: