先打開(kāi)超級(jí)終端，進(jìn)入rommon 模式（Ctrl+Break組合鍵），鍵入confreg, 如下：
rommon 1 > confreg 回車
Configuration Summary
enabled are:
load rom after netboot fails
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 (選擇 yes)
enable "diagnostic mode"? y/n [n]: n (選擇 no)
enable "use net in IP bcast address"? y/n [n]: n (選擇 no)
disable "load rom after netboot fails"? y/n [n]: n (選擇 no)
enable "use all zero broadcast"? y/n [n]: n (選擇 no)
enable "break/abort has effect"? y/n [n]: n (選擇 no)
enable "ignore system config info"? y/n [n]: n (選擇 no)
change console baud rate? y/n [n]: y (選擇 yes)
enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400
4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200 [0]: 7 (選擇 7,用最大的115200速率的xmodem傳輸)
change the boot characteristics? y/n [n]: n (選擇 no)
Configuration Summary
enabled are:
load rom after netboot fails
console baud: 115200
boot: image specified by the boot system commands
or default to: cisco2-C2600
do you wish to change the configuration? y/n [n]: n (選擇 no)
You must reset or power cycle for new config to take effect
rommon 2 > reset 回車
注意：在此時(shí)鍵入 reset鍵之前，開(kāi)始定義串口速度（我的電腦---端口屬性----串口速度調(diào)為115200），然后再修改超級(jí)終端里設(shè)置速率為115200，記住，一定這么做！否則出現(xiàn)亂碼！然后關(guān)閉這個(gè)超級(jí)終端，重新建立一個(gè)超級(jí)終端連接，（期間系統(tǒng)重新啟動(dòng)）啟動(dòng)后，出現(xiàn)
rommon 1> 提示符
然后,輸入
rommon 1> xmodem -r
Do not start the sending program yet...
Invoke this application only for disaster recovery.
Do you wish to continue? y/n [n]: y (選擇 yes)
Ready to receive file ...
此時(shí)，在超級(jí)終端的菜單上的“傳送”---“發(fā)送文件”----選擇IOS鏡像文件所在地以及選擇使用“xmodem”協(xié)議，點(diǎn)擊“發(fā)送”即可
然后等待10-20分鐘左右就把3-6M的IOS灌進(jìn)去了！
（修改回計(jì)算機(jī)串口與超級(jí)終端、路由器confreg下的xmodem等9600的傳輸速率）
（videre注：實(shí)際用的時(shí)候，我發(fā)現(xiàn)這個(gè)命令總是改不成功，后來(lái)發(fā)現(xiàn)在line con 0下面有了一個(gè)speed 115200，所以即使改register成功，啟動(dòng)以后router又執(zhí)行speed 115200,還是不行，所以如果有這個(gè)問(wèn)題，記得把這個(gè)語(yǔ)句no掉）
Router>en 進(jìn)入新IOS的特權(quán)模式
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Router#reload 重啟系統(tǒng)
Proceed with reload? [confirm] 回車
00:01:04: %SYS-5-RELOAD: Reload requested
System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)
Copyright (c) 1999 by cisco Systems, Inc.
TAC:Home:SW:IOS:Specials for info
PC = 0xfff0a530, Vector = 0x500, SP = 0x680127b0
C2600 platform with 24576 Kbytes of main memory
PC = 0xfff0a530, Vector = 0x500, SP = 0x80004684
monitor: command "boot" aborted due to user interrupt
rommon 1 > confreg （ 輸入“confreg”命令）
Configuration Summary
enabled are:
load rom after netboot fails
console baud: 115200
boot: image specified by the boot system commands
or default to: cisco2-C2600
do you wish to change the configuration? y/n [n]: y (選擇 yes)
enable "diagnostic mode"? y/n [n]: n (選擇 no)
enable "use net in IP bcast address"? y/n [n]: n (選擇 no)
disable "load rom after netboot fails"? y/n [n]: n (選擇 no)
enable "use all zero broadcast"? y/n [n]: n (選擇 no)
enable "break/abort has effect"? y/n [n]: n (選擇 no)
enable "ignore system config info"? y/n [n]: n (選擇 no)
change console baud rate? y/n [n]: y (選擇 yes)
enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400
4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200 [7]: 0 (選擇 0,改回用標(biāo)準(zhǔn)速率速率9600的xmodem傳輸)
change the boot characteristics? y/n [n]: n (選擇 no)
Configuration Summary
enabled are:
load rom after netboot fails
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]: n
You must reset or power cycle for new config to take effect
rommon 2 >
此時(shí)手工改回計(jì)算機(jī)串口與超級(jí)終端2者傳輸速率為9600
然后敲入
rommon 2 >reset
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