Cisco 2621 路由器密碼恢復實驗

清空路由器所有配置，重啓

Router#erase startup-config

Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]

[OK]

Erase of nvram: complete

%SYS-7-NV_BLOCK_INIT: Initialized the geometry of nvram

Router#reload

Proceed with reload? [confirm]

設置密碼，並保存配置

Router>en

Router#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#enable password 123

Router(config)#exit

Router#

%SYS-5-CONFIG_I: Configured from console by console

Router#wr

Building configuration...

[OK]

密碼恢復

關閉路由器電源並重新開機，在路由器啓動時，按【Ctrl+Break】鍵中斷路由器的啓動過程，進入rommon 模式。

rommon 1 > confreg 0x2142

rommon 2 > boot
......

         --- System Configuration Dialog ---

Continue with configuration dialog? [yes/no]: no


此時已可以直接進入特權模式，將NVRAM中的配置複製到RAM中

Router>

Router>en

Router#copy startup-config running-config

Destination filename [running-config]? 

429 bytes copied in 0.416 secs (1031 bytes/sec)

%SYS-5-CONFIG_I: Configured from console by console


重新設置密碼，保存配置，重啓。

Router#conf t

Enter configuration commands, one per line.  End with CNTL/Z.

Router(config)#enable password 123456

Router(config)#conf

Router(config)#config-register 0x2102

Router(config)#exit

%SYS-5-CONFIG_I: Configured from console by console

Router#wr

Building configuration...

[OK]

Router#reload

Proceed with reload? [confirm]