交换机密码恢复

本实验以WS-3550-48 SMI为例，详细描述对于2900xl/3500xl/2950/3550系列交换机的密码恢复流程

一、将一台终端或装有超级终端软件的PC接到交换机的console口上。终端参数设置如下：
速率：9600bps

校验位：无
数据位：8
停止位：1
流控：无
二、拨掉电源
三、按住前面板的mode键不放，插上电源，等3－5秒后松开mode键。你会看到如下提示：

Interrupt within 5 seconds to abort boot process.

Boot process terminated.

The system is unable to boot automatically.  The BOOT

environment variable needs to be set to a bootable

p_w_picpath.

switch:

switch: ?

           ? -- Present list of available commands

        boot -- Load and boot an executable p_w_picpath

         cat -- Concatenate (type) file(s)

        copy -- Copy a file

      delete -- Delete file(s)

         dir -- List files in directories

  flash_init -- Initialize flash filesystem(s)

      format -- Format a filesystem

        fsck -- Check filesystem consistency

        help -- Present list of available commands

 load_helper -- Load and initialize a helper p_w_picpath

      memory -- Present memory heap utilization information

       mkdir -- Create dir(s)

        more -- Concatenate (display) file(s)

      rename -- Rename a file

       reset -- Reset the system

       rmdir -- Delete empty dir(s)

         set -- Set or display environment variables

   set_param -- Set system parameters in flash

       sleep -- Pause (sleep) for a specified number of seconds

        trap -- Cause a software breakpoint to occur

 -- MORE --

        type -- Concatenate (type) file(s)

       unset -- Unset one or more environment variables

四、输入flash_init       //初始化flash文件系统
五、输入load _helper   
六、输入dir flash:
注意，不要少了flash后面的冒号，屏幕出现如下提示。
Directory of flash:/

3    -rwx  0         <date>               env_vars

4    -rwx  344       <date>               system_env_vars

5    -rwx  3624      <date>               config.text

6    -rwx  5         <date>               private-config.text

8    drwx  192       <date>               c3550-i9q3l2-mz.121-14.EA1a

86   -rwx  5         <date>               private-config.text.renamed

10243584 bytes available (5755392 bytes used)

七、输入rename flash:config.text flash:config.old

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

八、输入boot引导系统。

switch: boot

Loading "flash:c3550-i9q3l2-mz.121-14.EA1a/c3550-i9q3l2-mz.121-14.EA1a.bin"...##############################################################################################################################################################################################################################################################################################################################################################################################################

File "flash:c3550-i9q3l2-mz.121-14.EA1a/c3550-i9q3l2-mz.121-14.EA1a.bin" uncompressed and installed, entry point: 0x3000

executing...

九、当出现如下提示时，输入N：
Continue with the configuration dialog? [yes/no] : N
十、用en进入enable状态，并将文件config.old改回config.text，命令如下：
rename flash:config.old flash:config.text
十一、将原配置装入内存，命令如下：
switch# copy flash:config.text system:running-config
十二、修改密码：
switch#conf t