cisco-Router Switch password recovery

Router Password recovery:

Preparation: A PC is connected to a router with a console line

How it works: Fix the Register value if the forgotten password is locked outside the router

The default register value is 0x2102 (off), and to restore the password you need to turn this value on to tell the router to ignore the contents of the NVRAM. The value for opening the configuration register is 0x2142

Steps:

The router uses HyperTerminal for the first time (Hyper terminal or SECURECRT)

1 Press the Ctrl+break key at the same time (perform an interrupt to interrupt the boot order)

2 Modifying register values (modified to 0x2142)

Rommon 1>confreg 0x2142

Rommon 2>reset (isp/2600 series router, input I or reset heavy-duty router)

View modified configuration: Show Sartup-config Running-config

3 Change Password:

ROUTER#CONFG T

Router (config) #enable secret Cisco

4 Resetting the Register value and overloading the router

Router#config T

Router (config) #config-register 0x2102

Router (config) #exit

Router#copy running-config Startup-config (or write)

Router#reload

Switch password recovery:

Preparation: a PC and a switch are connected with the console line

How it works: Switch password recovery fundamentals: Change the Config.text file name in the switch to a different file name, and then enter the configuration mode to change the password, and finally restore the Config.text file name

Steps:

1. Power off first

2. Power off while holding down the mode key on the switch until the display light on the switch is no longer flashing (5~10s), then release

3. At this point, enter

Switch:flash_init (Initialize Flash)

Switch:load_helper

Switch:dir Flash (view flash)

Switch:rename Flash: (/) Config.text Flash: (/) Config.old (modified name)

Switch:dir Flash (again to see if the file name in the Flash is modified)

Switch:reset (restart switch)

4. Then go to:

Switch>

Switch>enable

Switch#config T

Switch (config) #enable password cisco (change password)

Switch (config) #exit

Switch#rename Flash: (/) Config.old Flash: (/) Config.text

Switch#copy Config.text Running-config

cisco-Router switch password recovery