如果交换机的login密码忘记了咋办啊? 
  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: