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　　1、启动路由器，在30秒那按ctrl+break，进入rommon模式

　　System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1)

　　Copyright (c) 2000 by cisco Systems, Inc.

　　C2600 platform with 65536 Kbytes of main memory

　　PC = 0xfff0ab6c, Vector = 0x500, SP = 0x80004884

　　monitor: command "boot" aborted due to user interrupt

　　rommon 1 >

　　2、然后输入

　　rommon 1 > confreg 0x2142

　　You must reset or power cycle for new config to take effect

　　rommon 2 > reset

　　3、路由器会重新启动

　　System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1)

　　Copyright (c) 2000 by cisco Systems, Inc.

　　C2600 platform with 65536 Kbytes of main memory

　　program load complete, entry point: 0x80008000, size: 0x8a7f8c

　　Self decompressing the image :

　　中间引导过程忽略。。。。。

　　--- System Configuration Dialog ---

　　Would you like to enter the initial configuration dialog? [yes/no]:

　　4、按ctrl+c

　　Press RETURN to get started!

　　Router>

　　Router>enable

　　Router#copy startup-config running-config

　　Destination filename [running-config]?

　　816 bytes copied in 0.884 secs

　　router1#

　　router1#conf t

　　Enter configuration commands, one per line. End with CNTL/Z.

　　router1(config)#

　　router1(config)#enable secret cisco

　　router1(config)#enable password 12345

　　router1(config)#line con 0

　　router1(config-line)#login

　　router1(config-line)#password cisco

　　router1(config-line)#exit

　　router1(config)#line aux 0

　　router1(config-line)#login

　　router1(config-line)#password cisco

　　router1(config-line)#exit

　　router1(config)#line vty 0 4

　　router1(config-line)#login

　　router1(config-line)#password cisco

　　router1(config-line)#exit

　　router1(config)#config-register 0x2102

　　router1(config)#exit

　　router1#

　　router1#copy running-config startup-config

　　Destination filename [startup-config]?

　　Building configuration...

　　[OK]

　　router1#