1.       路器由密布的恢复.(以2600为例)
2600、3600等新系列路由器步骤:
1、启动路由器,60秒内按下ctrl+break键
2、rommon>confreg 0x2142
3、rommon>reset
4、router#copy startup-config running-config
5、router(config)#no enable secrect //可以删除密码也可以更改,这里为删除
6、router(config-line)#no enable password
7、router#copy running-config startup
8、router(config)#config-register 0x2102
9、router#reload
2500系列路由器步骤:
1、启动路由器,60秒内按下ctrl+break键
2、>o/r 0x2142
3、>i
其余步骤跟2600、3600一样

2.交换机密码恢复(以2950为例)

重起交换机:按MODE键进入到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   //初始化flash:
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 //交换机启动时应用的配置
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   //重起交换机
Are you sure you want to reset the system (y/n)?y
System resetting...

重起交换机后由于交换机不会再应用配置文件,因为刚才已把配置文件的名字更改。交换机会进入到配置的对话模式。
--- System Configuration Dialog ---

Would you like to enter the initial configuration dialog? [yes ]: 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 c)
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口密码
sw(config)#no enable secret //清除enable密码
sw(config)#no enable password //清除enable密码
sw#write //重新保存