The process to recover a password (password recovery), which actually replaces only the back, the Cisco routers varies depending on the series. The commands and the method of this tutorial are for the following models:
Cisco 2000 Series Router
Cisco 2500 Series Router
Cisco 3000 Series Router
Cisco 4000 Series Router Cisco AccessPro
Cisco 7000 Route Processor (RP)
Cisco AGS + Routers
Cisco IGS Router Series
Cisco STS-10x Access Servers
Together with the command to retrieve the password for a Cisco Router, here also present the explanation to understand what they are doing and do not do it mechanically.
Cisco Router Password Recovery
Step 1 - Power and Income ROM Monitor Mode
- Switch on the router.
- Do the POST and load the IOS.
- Press the CTRL + break (Pause)
With these steps, you should have entered the ROM Monitor mode, and you must receive the prompt>. If they do not take the key combination CTRL + break (pause), here a list of other possible combinations.
Step 2 - Display Configuration Register Value
Once you are in the ROM Monitor mode with the prompt> tipeamos the letter “o” and “enter.” In the result is to show the value of the record that you have to change to recover the password of the router, have to find the line:
> Or
“Configuration register = 0×2102 at last boot”
In this case the value is 0×2102, you also can get the value 0×102. This value is what you are going to change, keep the fact that after going to have to restore it.
Step 3 - Change the Configuration Register Value and Reboot the Router
> O / r 0×2142
> I
With the command “o / r 0×2102 modify the value of 0×2142 and reboot the router with the” i “. By changing the value of what you are doing is that when the router fails to load the startup configuration file.
Step 4 - Change Password and Registry Value Back to Original
— System Configuration Dialog —
Would you like to enter the initial configuration dialog? [Yes / no]: n
Router> enable
Router # configure terminal
Router (config) # enable secret password again
Router (config) # config-register 0×2102
Router (config) # exit
Router # copy running-config startup-config
Router # reload
Once you restart the router is going to ask if you want to enter the Initial Setup Mode, you do not(n) and you will display the prompt Router>. We enter the privileged EXEC mode, Global Configuration Mode; you set an enable secret password and then put the configuration register value as originally so that when you restart the router back to take the configuration file with the new password. You leave the Global Configuration Mode and Privileged Exec mode copy the current configuration (running-config) in the startup configuration (startup-config), reboot the router and already have the router with your new password.