>o                                                                 //显示register值
Configuration register = 0x2142 at last boot
Bit#    Configuration register option settings:
15      Diagnostic mode disabled
14      IP broadcasts do not have network numbers
13      Boot default ROM software if network boot fails
12-11   Console speed is 9600 baud
10      IP broadcasts with ones
08      Break disabled
07      OEM disabled
06      Ignore configuration enabled
03-00   Boot file is cisco2-2500 (or 'boot system' command)
>o/r 0x2142                                                //修改register值
>i                                                                 //重新启动路由器
 进入路由器，EN就不要密码了，
进入路由器：
   Router#configure terminal

   Router(config)#config-register 0x2102      //恢复正常配置寄存器
  Router#copy running-config startup-config  //保存当前配置信息
或： Router# wr