方法1：

开机状态下

F3-2F#erase startup-config 

Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]

[OK]

Erase of nvram: complete

*Mar  1 00:04:19.946: %IP_SNMP-4-NOTRAPIP: SNMP trap source FastEthernet0/1 has no ip address

*Mar  1 00:04:21.204: %SYS-7-NV_BLOCK_INIT: Initialized the geometry of nvram

F3-2F#reload 

Proceed with reload? [confirm]

*Mar  1 00:04:44.893: %SYS-5-RELOAD: Reload requested by console. Reload reason: Reload command

*Mar  1 00:04:44.902: %IP_SNMP-4-NOTRAPIP: SNMP trap source FastEthernet0/1 has no ip address

Boot Sector Filesystem (bs) installed, fsid: 2

Base ethernet MAC Address: cc:d5:39:02:80:00

Xmodem file system is available.

The password-recovery mechanism is enabled.

Initializing Flash...

flashfs[0]: 539 files, 19 directories

flashfs[0]: 0 orphaned files, 0 orphaned directories

flashfs[0]: Total bytes: 32514048

flashfs[0]: Bytes used: 13510144

flashfs[0]: Bytes available: 19003904

flashfs[0]: flashfs fsck took 11 seconds.

...done Initializing Flash.

done.

方法2：

未开机状态下

开机，按mode键后，在如下的switch:提示符后输入

switch:flash_init

switch:rename flash:config.text flash:config.old

switch:boot

启动后就没了

方法3：

开机状态下：

按住mode键，在所有指示灯闪烁过后松开，一般是10-15S左右，即可恢复初始状态

初始化交换机-恢复交换机出厂设置-恢复默认设置Cisco