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如果你不小心使用了命令erase flash 那么发生什么就可想而知了。因此,建议在你拿到器等设备时 最好先将它的IOS等操作系统备份出来,以备万一! 
 本篇主要介绍通过Xmodem上传IOS的过程(以2610为例,不过这个方法用在其他设备上没什么太大区别)准备工作,只要有Cio原配的线缆就可以(注:Xmodem与实际的modem没有任何联系 只是一个传输协议 数据是通过终端的串口和器的Console口灌进去的) 
  
 在没有IOS的情况下 系统只能进入Rommon状态,在这个状态下只能见到如下命令: 
 rommon 8 > ? 
 alias set and display aliases command 
 boot boot up an external process 
 break set/show/clear the breakpoint 
 confreg configuration register utility 
 cont continue executing a downloaded image 
 context display the context of a loaded image 
 cookie display contents of cook PROM in hex 
 dev list the device table 
 dir list files in file system 
 dis display instruction stream 
 dnld serial download a program module 
 frame print out a selected stack frame 
 help monitor builtin command help 
 history monitor command history 
 meminfo main memory information 
 repeat repeat a monitor command 
 reset system reset 
 set display the monitor variables 
 stack produce a stack trace 
 sync write monitor environment to NAM 
 sysret print out info from last system return 
 tftpdnld tftp image download 
 unalias unset an alias 
 unset unset a monitor variable 
 xmodem x/ymodem image download 
  
  
 在这个模式下,输入Xmodem 
  
  
 rommon 9 > xmodem 
  
  
 会提示如下警告: 
 WARNING: All existing data in bootflash will be lost! 
 Invoke this application only for disaster recovery. 
 Do you wish to continue? y/n [n]: y 
 Ready to receive file ? ... 
  
  
 然后在超级终端的传送栏目=> 选择发送选项 => 再选择Xmodem 并指明IOS所在的路径即开始上传IOS,等待时间很长,视IOS的大小和传输速度。对于初次做IOS上传,建议不要去修改什么传输速率。传完以后 对整个系统初始化 界面如下: 
  
  
 Erasing flash at 0x603c0000 
 program flash location 0x602f0000 
 Download Complete! 
 program load complete, entry point: 0x80008000, size: 0x2f0074 
 Self decompressing the im 
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