Category Archives: Cisco

Password Recovery on Cisco 1800 series

1841800px-Cisco_logo.svg

Every now & then I have to reset or reconfigure an older Cisco device that I come across in my day to day. This is just for me personally to remember. If it helps you too, then your welcome! ūüėČ

Please see the regular process to reset the password on 1841 Router below,

  • Use the console to connect to the 1841
  • Use the power switch in order to turn off the router, and then turn the router back on
  • SEND BREAK within 60 seconds of power up in order to put the router into ROMMON
  • Type confreg 0x2142 at the rommon 1> prompt in order to boot from Flash

This step bypasses the startup configuration where the passwords are stored

  • Type reset at the rommon 2>¬†reset

The router reboots, but ignores the saved configuration.

  • Type no after each setup question, or press Ctrl-C in order to skip the initial setup procedure.
  • Type enable at the Router> prompt.
  • You are in enable mode and should see the Router# prompt.
  • Type copy startup-config running-config in order to copy the nonvolatile RAM (NVRAM) into memory.

Important:

Do not type copy running-config startup-config or write. These commands erase your startup           configuration.

  • Type configure terminal
  • Type #enable secret <password> in order to change the enable secret password.
  • Type config-register #config-register 0x2102
  • Type write memory or #copy running-config startup-config in order to commit the changes
  • RELOAD

Refer:

http://www.cisco.com/en/US/products/hw/routers/ps221/products_password_recovery09186a0080094773.shtml

Advertisements