Qui trình khôi phục password (password recovery)

I. Đối với Cisco 1600, 1700 and 2600 Series Routers:

1. Vào HyperTerminal (Private Edition 5.0 or higher) console.

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

monitor: command "boot" aborted due to user interruptrommon 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>enablerouter#copy startup-config running-config

7.

router>enablerouter#show startup-config

8. Đặt lại password mới:

router#config termrouter(config)#enable secret newpasswordrouter(config)#enable password newpasswordrouter(config)#line con 0router(config-line)#loginrouter(config-line)#password newpasswordrouter(config)#line aux 0router(config-line)#loginrouter(config-line)#password newpasswordrouter(config)#line vty 0 4router(config-line)#login

router(config-line)#password newpassword

9. #copy run start

10. Khôi phục giá trị thanh ghi về 0x2102

router#config termrouter(config)#config-register 0x2102router(config)#exitrouter#copy running-config startup-config

11. Kiểm tra nội dung thanh ghi

router#show versionCisco Internetwork Operating System SoftwareIOS (tm) C2600 Software (C2600-DO3S-M), Version 12.0(5)T1, RELEASESOFTWARE (fc1)Copyright (c) 1986-1999 by cisco Systems, Inc.Compiled Tue 17-Aug-99 13:18 by cmongImage text-base: 0x80008088, data-base: 0x80CB67B0ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)1 FastEthernet/IEEE 802.3 interface(s)2 Low-speed serial(sync/async) network interface(s)32K bytes of non-volatile configuration memory.8192K bytes of processor board System flash (Read/Write)

Configuration register is 0x2142 (will be 0x2102 at next reload)

II. Cisco 2500 Series Routers:

1. Thiết lập HyperTerminal (Private Edition 5.0 or higher) console .

2. Tắt routers, sau đó bật lại. Nhấn CTRL-BREAK trong vòng 60 giây.

Abort at 0x10EA884 (PC)>

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>enablerouter#copy startup-config running-config7. Thực hiện các lệnh show running-config or show startup-config router#show startup-config

8.

router#config termrouter(config)#enable secret newpasswordrouter(config)#enable password newpasswordrouter(config)#line con 0router(config-line)#loginrouter(config-line)#password newpasswordrouter(config)#line aux 0router(config-line)#loginrouter(config-line)#password newpasswordrouter(config)#line vty 0 4router(config-line)#loginrouter(config-line)#password newpassword

9. Copying the startup-configuration to running-configuration. Thực hiện lệnh no shutdown trên tất cả các interface được dùng.

10. Chuyển nội dung thanh ghi về giá trị ban đầu. Lưu cấu hình

router#config termrouter(config)#config-register 0x2102router#copy running-config startup-config

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

router#show versionCisco Internetwork Operating System SoftwareIOS (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 SOFTWAREBOOTFLASH: 3000 Bootstrap Software (IGS-RXBOOT), Version 10.2(8a), RELEASESOFTWARE (fc1)1 Ethernet/IEEE 802.3 interface(s)

2 Serial network interface(s)1 ISDN Basic Rate interface(s)32K bytes of non-volatile configuration memory.8192K bytes of processor board System flash (Read ONLY)Configuration register is 0x2142 (will be 0x2102 at next reload)

12. Reboot the router.router#reload