Cisco 2811 Router password reset

[d_talekar1]

Hi

I have forgotten the username and password for Cisco 2811 router. is there option wherein we will get it reset or any other way we will able to retrieve the information for username and password

[aydinnmu1]

hi,

you should open that router in rommon mode ( use "break" button in keyboard). and change confreg number.

Default value is 0x2102 . new value is 0x2142. 

And reboot.

Then router will open with no configuration. (Because 0x2142 ignore nvram and startup-config is stored in nvram). 

After you should copy config files in flash to running config and set new username and password.

That link include other confreg values.

http://www.cisco.com/c/en/us/support/docs/routers/10000-series-routers/50421-config-register-use.html