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在安装、使用和配置思科路由器产品的时候，遇到配置无法保存的情况，可以通过下面的方法来解决这个IOS系统的问题：
System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
Copyright (c) 1999 by cisco Systems, Inc.
TAC:Home:SW:IOS:Specials for info
C2600 platform with 24576 Kbytes of main memory
program load complete, entry point: 0x80008000, size: 0x371d9c
PC = 0xfff0a530, Vector = 0x500, SP = 0x817ffeb0
--------------在这里按CTRL+BREAK------------
monitor: command "boot" aborted due to user interrupt
rommon 1 > confreg --------------在这里输入CONFREG
Configuration Summary
enabled are:
use all zero broadcast
break/abort has effect
ignore system config info
console baud: 9600
boot: image specified by the boot system commands
or default to: cisco2-C2600
do you wish to change the configuration? y/n [n]: y --------回答Y
enable "diagnostic mode"? y/n [n]: --------直接回车
enable "use net in IP bcast address"? y/n [n]: ---------直接回车
enable "load rom after netboot fails"? y/n [n]: ---------直接回车
disable "use all zero broadcast"? y/n [n]: ---------直接回车
disable "break/abort has effect"? y/n [n]: ---------直接回车
disable "ignore system config info"? y/n [n]: y ---------注意前面是DISABLE,要输入Y,再回车
change console baud rate? y/n [n]: ---------直接回车
change the boot characteristics? y/n [n]: ---------直接回车
Configuration Summary
enabled are:
use all zero broadcast
break/abort has effect
console baud: 9600
boot: image specified by the boot system commands
or default to: cisco2-C2600
do you wish to change the configuration? y/n [n]: ---------直接回车
You must reset or power cycle for new config to take effect
rommon 2 > reset ---------输入RESET回车
System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
Copyright (c) 1999 by cisco Systems, Inc.
TAC:Home:SW:IOS:Specials for info
C2600 platform with 24576 Kbytes of main memory
program load complete, entry point: 0x80008000, size: 0x371d9c
Self decompressing the image :
############################### [OK]
重新启动，思科的IOS系统就恢复正常了，可以保存配置了。 | 
