XX交通局客户cisco3745 IOS丢失，只能进入ROMMON模式。解决过程：
1。连接console线缆。
2。加电进入ROMMON模式
System received a Software forced crash ***
signal= 0x17, code= 0x5, context= 0x80020ae0
PC = 0x800080d4, Cause = 0x20, Status Reg = 0x3041a803
c3745 processor with 131072 Kbytes of main memory
Main memory is configured to 64 bit mode with parity disabled
Readonly ROMMON initialized
Compact Flash:External not present
c3745 processor with 131072 Kbytes of main memory
Main memory is configured to 64 bit mode with parity disabled
Rommon 1 >
3。输入dir 显示如下。
rommon 2> dir flash:
1 -rw- 21342280 ?
rommon 1 >
IOS文件名处显示为？，怀疑IOS文件有误，决定重传。
4。输入confreg修改console baud rate为最高值115200,重启路由器。
rommon 3 >confreg
Configuration Summary
enabled are:
break/abort has effect
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n [n]: y
enable "diagnostic mode"? y/n [n]:
enable "use net in IP bcast address"? y/n [n]:
enable "load rom after netboot fails"? y/n [n]:
enable "use all zero broadcast"? y/n [n]:
disable "break/abort has effect"? y/n [n]:
enable "ignore system config info"? y/n [n]:
change console baud rate? y/n [n]: y
enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400
4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200 [0]: 7
change the boot characteristics? y/n [n]:
Configuration Summary
enabled are:
break/abort has effect
console baud: 115200
boot: the ROM Monitor
do you wish to change the configuration? y/n [n]:
You must reset or power cycle for new config to take effect.
rommon 4 >reset
5。修改终端的baud rate为115200,与路由器匹配，以免产生乱码。
6。输入xmodem -r 命令,建议用最小的IOS，这样恢复时间可缩短。该文件为14M左右，上传用了55分钟。
rommon 1>xmodem -r c3745-ipbase-mz[1].124-2.T.bin
7。传输完成后，路由器会自动重启，进入正常模式。此时输入dir 显示结果如下。文件名处仍为？且 说明FLASH内无映象。
Router# dir
Directory of flash:/
1 -rw- 21342280 ?
32112636 bytes total (10770292 bytes free)
8。使用copy tftp flash命令。将IOS文件拷入FLASH内。就可完在恢复。
route#copy tftp flash:
此次升级过程中未发现3745的ROMMON模式下有TFTPDNLD命令，可用于IOS的恢复，而该命令在26系列的有的。
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