Cisco路由器交换机密码恢复

retgb

1. Router>enable

Password:

Password:

Password:

% Bad passwords

Router>

Router>show version

Cisco IOS Software,3600 Software (C3640-JK9O3S-M), Version 12.4(16), RELEASE SOFTWARE (fc1)

Technical Support:http://www.cisco.com/techsupport

Copyright (c) 1986-2007by Cisco Systems, Inc.

Compiled Wed 20-Jun-0711:43 by prod_rel_team

ROM: ROMMON EmulationMicrocode

ROM: 3600 Software(C3640-JK9O3S-M), Version 12.4(16), RELEASE SOFTWARE (fc1)

Router uptime is 1minute

System returned to ROMby unknown reload cause - suspect boot_data[BOOT_COUNT] 0x0, BOOT_COUNT 0,BOOTDATA 19

System image file is"tftp://255.255.255.255/unknown"

This product containscryptographic features and is subject to United

States and localcountry laws governing import, export, transfer and

use. Delivery of Ciscocryptographic products does not imply

third-party authorityto import, export, distribute or use encryption.

Importers, exporters,distributors and users are responsible for

compliance with U.S.and local country laws. By using this product you

agree to comply withapplicable laws and regulations. If you are unable

to comply with U.S. andlocal laws, return this product immediately.

         

A summary of U.S. lawsgoverning Cisco cryptographic products may be found at:

http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require furtherassistance please contact us by sending email to

export@cisco.com.

Cisco 3640 (R4700)processor (revision 0xFF) with 94208K/4096K bytes of memory.

Processor board ID00000000

R4700 CPU at 100MHz,Implementation 33, Rev 1.2

1 Ethernet interface

4 Serial interfaces

DRAM configuration is64 bits wide with parity enabled.

125K bytes of NVRAM.

8192K bytes ofprocessor board System flash (Read/Write)

Configuration registeris 0x2142

Router>

2. 在路由重启时，按下ctrl+break键，进入rommon模式
System Bootstrap, Version 12.2(7r) [cmong 7r], RELEASE SOFTWARE (fc1)
Copyright (c) 2002 by cisco Systems, Inc.
C2600 platform with 131072 Kbytes of main memory

PC = 0xfff0ac3c, Vector = 0x500, SP = 0x8000438c

monitor: command "boot" aborted due to user interrupt
rommon 1 >

3. 在rommon模式下，修改寄存值为0x2142
rommon 1 > confreg 0x2142

4. 重启路由器，使修改后的寄存值生效
rommon 2 > reset


5.进入路由器的手工配置模式
Would you like to enter the initial configuration dialog? [yes/no]: no

Router>enable
Router#

6. 将NVRAM中的startup-config文件copy至running-config中
Router#copy startup-config running-config

Destination filename [running-config]?

988 bytes copied in 2.600 secs (380 bytes/sec)
Router#
7. 进入全局模式，修改用户模式进入特权模式的密码
Router#configure terminal
Router (config)#enable password cisco

Router#show ip interface brief
Router(config)#interface Ethernet0/0

Router(configif)#noshutdown

8 .将寄存值还原成0x2102
Router (config)#config-register 0x2102

9.保存配置文件
Router#copy running-config startup-config

注：2500系列路由器的寄存值修改命令为 o/r 0x2142 ，重启命令为 i 。
--------------------------------------------------------------------------------------------------------------------------------------Cisco交换机的密码恢复
1.重启交换机，按下交换机上的MODE键，进入boot模式（10-15s）。
The system has been interrupted prior toinitializing the
flash filesystem.
The following commands will initialize
the flash filesystem, and finish loading theoperating
system software:


flash_init

load_helper

boot

switch:

2.键入 flash_init命令，初始化 flash
switch: flash_init

3.输入 load_helper 命令，执行 dir flash
switch: load_helper
switch: dir flash:
Directory of flash:/

2
-rwx
109
<date>
info
3
-rwx
3110758
<date>
c2950-i6q4l2-mz.121-22.EA6.bin
4
drwx
4160
<date>
html
373
-rwx
109
<date>
info.ver
374
-rwx
335466
<date>
c2950-hdiag-mz.121-9.EA1
376
-rwx
856
<date>
vlan.dat
377
-rwx
5
<date>
private-config.text
378
-rwx
309
<date>
env_vars
379
-rwx
1106
<date>
config.text

4.修改 flash 中的config.text文件
switch: rename flash:config.text flash:config.old

5.重启交换机
switch: boot
进入交换机的配置模式，进入交换机的特权模式

6.恢复原配置文件
Switch#rename flash:config.old flash:config.text

7.调用原配置文件，恢复原交换机配置
Switch#copy flash:config.text system:running-config

8.进入全局模式修改用户模式进入特权模式的密码
Switch#configure terminal
Switch(config)#enable password cisco

9.保存配置文件
Switch#write memory
注：2500系列路由器的寄存值修改命令为 o/r 0x2142 ，重启命令为 i

http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_tech_note09186a00801746e6.shtml

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