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QUY TRÌNH KHÔI PHỤC PASSWORD
(password recovery)I. Đối với Cisco 1600, 1700 and 2600 Series Routers:
1. Establish a HyperTerminal (Private Edition 5.0 or higher) console connection with the router.

2. Tắt router, sau đó bật lại. Nhấn Ctrl-Break trong vòng 60 giây

monitor: command "boot" aborted due to user interrupt

rommon 1 >

3. Dùng lệnh confreg để đổi nội dung thanh ghi sang 2142.

rommon 1 >confreg 0x2142

4. Reboot the router with the reset command.

rommon 2 >reset

5. Sau khi reboot, dùng Ctrl-C để vào user mode:

router>

6.



router(config-line)#password newpassword

router(config)#line vty 0 4

router(config-line)#login

router(config-line)#password newpassword

9. #copy run start

10. Khôi phục giá trị thanh ghi về 0x2102

router#config term

router(config)#config-register 0x2102

router(config)#exit

router#copy running-config startup-config

11. Kiểm tra nội dung thanh ghi

router#show version

Cisco Internetwork Operating System Software

IOS (tm) C2600 Software (C2600-DO3S-M), Version 12.0(5)T1, RELEASE

SOFTWARE (fc1)


3. Đổi nội dung thanh ghi thành 0x2142

>o/r 0x2142 (lower case of the letter O for o/r and zero for 0x2142)

4. Reboot router

>i

5. Nhấn Ctrl-C để vào user mode khi router khởi động lại

router>

6. Vào enable mode

router>enable

router#copy startup-config running-config

7. Thực hiện các lệnh show running-config or show startup-config

router#show startup-config

8. Enter a new privileged password and change other lost passwords as may be necessary.

router#config term

router(config)#enable secret newpassword

router(config)#enable password newpassword


router#copy running-config startup-config

11. Kiểm tra thanh ghi có giá trị là 2102 bằng lệnh show version

router#show version

Cisco Internetwork Operating System Software

IOS (tm) 2500 Software (C2500-D-L), Version 12.0(4), RELEASE SOFTWARE

(fc1)

Copyright (c) 1986-1999 by cisco Systems, Inc.

ROM: System Bootstrap, Version 5.2(8a), RELEASE SOFTWARE

BOOTFLASH: 3000 Bootstrap Software (IGS-RXBOOT), Version 10.2(8a), RELEASE

SOFTWARE (fc1)

1 Ethernet/IEEE 802.3 interface(s)

2 Serial network interface(s)

1 ISDN Basic Rate interface(s)
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