思科路由器密碼恢復

拓撲圖：

• 1 配置任意特權加密密碼,並保存

Router>enable 
Router#config t 
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#hostname R1
R1(config)#interface g 0/0 
R1(config-if)#ip address 192.168.1.1 255.255.255.0 
R1(config-if)#no shutdown
R1(config-if)#enable secret asdf
%LINK-5-CHANGED: Interface GigabitEthernet0/0, changed state to up
R1(config)#exit
R1#
%SYS-5-CONFIG_I: Configured from console by console

R1#wr
Building configuration...
[OK]
R1#

• 2 重啓路由器reload

• 3 在加載系統過程當中， 使用 Ctrl+Break 鍵或者 Ctrl+C 鍵，修改 confreg寄存器的值，使路由器繞過配置文件進入系統

  rommon 1 > help
  boot                boot up an external process
  confreg             configuration register utility
  dir                 list files in file system
  help                monitor builtin command help
  reset               system reset
  set                 display the monitor variables
  tftpdnld            tftp image download
  unset               unset a monitor variable
  rommon 2 > confreg 0x2142
  rommon 3 > reset

• 4 此時已能夠不輸入密碼便可進入系統，這時咱們從新配置密碼。配置密碼完成後，修改confreg寄存器的值，引導系統正常啓動。

Router>en
Router#config t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#hostname R1
R1(config)#enable sec
R1(config)#enable secret 123abc
R1(config)#config-register 0x2102
R1(config)#end
R1#
%SYS-5-CONFIG_I: Configured from console by console

R1#wr
Building configuration...
[OK]

• 5 最後重啓reload