路由器密码恢复：
1.先关闭电源，重新启动路由器，注意终端上显示 press CTRL+B to enter extended boot menu 的时候，我们迅速按下ctrl+B，这样将进入扩展启动选项
2.进入路由器视图：
低端H3C设备：
***********************************************
* *
* Quidway Series Router Bootrom, V5.1 *
* *
***********************************************
Quidway R1600 Hardware Version 1.0
Copyright（C） 1999-2002 by HUAWEI TECHNOLOGIES CO., LTD.
Compiled at 11:30, Wed 13-Jun-2001.
Testing DRAM…################
16384K bytes DRAM OK .
2560K bytes flash memory.
Press Ctrl-B to enter Boot Menu .
Please input Bootrom password:
Boot Menu:
1: Download application program
2: Download Bootrom program
3: Modify Bootrom password
4: Exit the menu
5: Reboot
Enter your choice（1-5）：
此时，按下ctrl+p
############################ Boot Menu: 1: Download application program 2: Download Bootrom program 3: Modify Bootrom password 4: Exit the menu 5: Reboot Enter your choice（1-5）： 5
重启完成后即可直接进入系统视图
中端H3C设备：
********************************************
* *
* Quidway Series Routers Boot ROM, V4.69 *
* *
********************************************
Copyright（C） 2002-2005 by HUAWEI TECH CO., LTD.
Compiled at 11:14:01 , Dec 2 2002.
Now testing memory…OK!
64M bytes SDRAM
8192k bytes flash memory
Press Ctrl-B to enter Boot Menu
Please input Bootrom password:
Boot Menu:
1: Download application program with XMODEM
2: Download application program with TFTP
3: Clear application password
4: Clear configuration
5: Exit and reboot
Enter your choice（1-5）： 3
Erase application program password.Press key when ready.
Erasing…
Boot Menu:
1: Download application program with XMODEM
2: Download application program with TFTP
3: Clear application password
4: Clear configuration
5: Exit and reboot
Enter your choice（1-5）： 5
重启完成后，即可直接进入系统视图[Router]，此时再更或新增改类型为admin的exec密码，保存即可
