Wednesday, April 28, 2010

Password Reset on a Cisco 1600-Series Router

Abstract: Someone forgot the admin passwords to a Cisco 1600-series router and you have physical access to the router.

You'll need to know the break key sequence for your terminal program, fortunately Cisco has provided a handy list: Standard Break Key Sequence Combinations.

Connect your computer to the router's console port, ensure your terminal software is functioning and configured properly (baud: 9600, data: 8, parity: none, stop: 1, flow control: none, com ports will vary), and start or hard cycle the Cisco's power.

Enter the break key sequence within 60 seconds.

ROMMON> confreg 0x2142
ROMMON> reset

..enter setup mode [yes/no] no
c1600> enable (no passwords are required)
c1600# copy startup-config running-config

Set your new passwords.

c1600# copy running-config startup-config
c1600# config term
c1600(config)# config-register 0x2102
c1600(config)# reload

That's it.

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