cisco路由器的密码恢复

要求:1.掌握 cisco 路由器密码恢复

拓扑:
Cisco路由器、交换机密码恢复【实用基础技术】_技术



配置:

1.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 >

2. rommon模式下修改寄存值为0x2142
rommon 1 > confreg 0x2142

3.重启路由器使修改后的寄存值生效
rommon 2 > reset


4.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#

5.NVRAM中的startup-config文件copyrunning-config
Router#copy startup-config running-config

Destination filename [running-config]?

988 bytes copied in 2.600 secs (380 bytes/sec)
device-RT1#

6.进入全局模式修改用户模式进入特权模式的密码
device-RT1#configure terminal
device-RT1(config)#enable password cisco

7.将寄存值还原成0x2102
device-RT1(config)#config-register 0x2102

8.保存配置文件
device-RT1#copy running-config startup-config

: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

要求:1.掌握 cisco 交换机密码恢复

拓扑:
Cisco路由器、交换机密码恢复【实用基础技术】_路由器_02

 



配置:

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 to initializing the
flash filesystem.
The following commands will initialize

the flash filesystem, and finish loading the operating
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

完成。