如果交换机的login密码忘记了，别急别急,只要你有PC,有类似超级终端(Hyper Terminal)这样是终端程序,连接到交换机的console口,那么密码的恢复就N简单了.

1.对于Catalyst 2900/3500XL系列来说:
拔下交换机的电源线,然后按住交换机的Mode按钮,再重新插上交换机的电源线.直到端口Port 1x的LED熄灭之后释放Mode按钮.
就这么简单,别告诉我你不知道Mode按钮在哪啊-_-#

2.对于Catalyst 2940/2950L系列来说:
拔下交换机的电源线,然后按住交换机的Mode按钮,再重新插上交换机的电源线.直到STAT的LED熄灭之后释放Mode按钮.

3.对于Catalyst 2955系列来说:
Catalyst 2955没有没有外部的Mode按钮,因此就不能使用之前的那种方法来进行密码恢复.在交换机启动时,对于Windows系列的PC,按下Ctrl+Break键;对于UNIX系列的工作站,按下Ctrl+C.如下:
C2955 Boot Loader (C2955−HBOOT−M) Version 12.1(0.0.514), CISCO DEVELOPMENT TEST
VERSION
Compiled Fri 13−Dec−02 17:38 by madison
WS−C2955T−12 starting...
Base ethernet MAC Address: 00:0b:be:b6:ee:00
Xmodem file system is available.

Initializing Flash...
flashfs[0]: 19 files, 2 directories
flashfs[0]: 0 orphaned files, 0 orphaned directories
flashfs[0]: Total bytes: 7741440
flashfs[0]: Bytes used: 4510720
flashfs[0]: Bytes available: 3230720
flashfs[0]: flashfs fsck took 7 seconds.
...done initializing flash.
Boot Sector Filesystem (bs:) installed, fsid: 3
Parameter Block Filesystem (pb:) installed, fsid: 4
/---接下来交换机会在15秒内自动启动,等出现该信息之后,按下Ctrl+Break键或Ctrl+C键----/

The system has been interrupted prior to initializing the flash file system to finish
loading the operating system software:
flash_init
load_helper
bootswitch:

接下来输入flash_init命令:
switch:flash_init
Initializing Flash...
flashfs[0]: 143 files, 4 directories
flashfs[0]: 0 orphaned files, 0 orphaned directories
flashfs[0]: Total bytes: 3612672
flashfs[0]: Bytes used: 2729472
flashfs[0]: Bytes available: 883200
flashfs[0]: flashfs fsck took 86 seconds
....done Initializing Flash.
Boot Sector Filesystem (bs:) installed, fsid: 3
Parameter Block Filesystem (pb:) installed, fsid: 4
switch:

接着输入load_helper命令:
switch:load_helper
switch:

再输入dir flash:命令显示交换机的文件系统:
switch:dir flash:
Directory of flash:/
2 −rwx 1803357 <date> c3500xl−c3h2s−mz.120−5.WC7.bin
4 −rwx 1131 <date> config.text
5 −rwx 109 <date> info
6 −rwx 389 <date> env_vars
7 drwx 640 <date> html
18 −rwx 109 <date> info.ver
403968 bytes available (3208704 bytes used)
switch:

把配置文件重命名:
switch:rename flash:config.text flash:config.old
switch:

输入boot命令启动交换机:
switch:boot
Loading "flash:c3500xl−c3h2s−mz.120−5.WC7.bin"...###############################
################################################################################
######################################################################
File "flash:c3500xl−c3h2s−mz.120−5.WC7.bin" uncompressed and installed, entry po
int: 0x3000
executing...

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