以2950爲例
重起交換機：按MODE鍵進入到switch:模式 如下
C2950 Boot Loader (C2950-HBOOT-M) Version 12.1(11r)EA1, RELEASE SOFTWARE (fc1)
Compiled Mon 22-Jul-02 17:18 by antonino
WS-C2950-24 starting...
Base ethernet MAC Address: 00:13:1a:9a:2b:80
Xmodem file system is available.
The system has been interrupted prior to initializing the
flash filesystem. The following commands will initialize
the flash filesystem, and finish loading the operating
system software:
flash_init
load_helper
boot
switch: flash_init
Initializing Flash...
flashfs[0]: 4 files, 1 directories
flashfs[0]: 0 orphaned files, 0 orphaned directories
flashfs[0]: Total bytes: 7741440
flashfs[0]: Bytes used: 3090944
flashfs[0]: Bytes available: 4650496
flashfs[0]: flashfs fsck took 6 seconds.
...done initializing flash.
Boot Sector Filesystem (bs:) installed, fsid: 3
Parameter Block Filesystem (pb:) installed, fsid: 4
switch: load_helper
switch: dir
List of filesystems currently registered:
flash[0]: (read-write)
xmodem[1]: (read-only)
null[2]: (read-write)
bs[3]: (read-only)
switch: dir flash:
Directory of flash:/
2 -rwx 736 <date> vlan.dat
3 -rwx 3086336 <date> c2950-i6q4l2-mz.121-22.EA2.bin
5 -rwx 1558 <date> config.text #########交換機啓動時應用的配置
6 -rwx 5 <date> private-config.text
4650496 bytes available (3090944 bytes used)
switch: rename flash:config.text flash:config-old.txt #########重命名config.text
switch: reset #########重起交換機
Are you sure you want to reset the system (y/n)?y
System resetting...
重起交換機後由於交換機不會再應用配置文件，因爲剛纔已把配置文件的名字更改。交換機會進入到配置的對話模式。如查
--- System Configuration Dialog ---
Would you like to enter the initial configuration dialog? [yes/no]: n
Switch#dir
Directory of flash:/
2 -rwx 736 Mar 01 1993 00:19:14 +00:00 vlan.dat
3 -rwx 3086336 Jan 01 1970 01:12:26 +00:00 c2950-i6q4l2-mz.121-22.EA2.bin
5 -rwx 1558 Mar 01 1993 02:36:44 +00:00 config-old.txt
6 -rwx 5 Mar 01 1993 02:36:44 +00:00 private-config.text
7741440 bytes total (4650496 bytes free)
Switch#copy config-old.txt running-config
Destination filename [running-config]?
1558 bytes copied in 1.152 secs (1352 bytes/sec)
sw#config t
Enter configuration commands, one per line. End with CNTL/Z.
sw(config)#line console 0
sw(config-line)#no pass cisco #########清除console口密碼
sw(config)#no enable secret #########清除enable密碼
sw(config)#no enable password #########清除enable密碼
sw#write #########重新保存