2.交换机控制口密码清除
（1）用电脑连接交换机的console口，并用CRT远程。
（2）重启交换机，按“Ctrl+B”进入 Boot Menu，会出现
1: Download application program with XMODEM 2: Download application program with NET 3: Set application file type 4: Display applications in Flash 5: Clear application password 6: Start up and ignore configuration 7: Enter debugging environment 8: Boot Rom Operation Menu 9: Do not check the version of the software a: Exit and reboot
Enter your choice(1-a): 选择5后选择a重启路由器
3.控制口连接
原文：http://blog.51cto.com/13742773/2307120