Cisco IOS Password Recovery
From NetworkStuff
The following details the basic procedure for performing password recovery on Cisco IOS based devices.
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Prerequisites
These pre-requisites must be met;
- Working serial console connection to the device, (a Cisco rollover cable is required)
Password Recovery Procedure
- Connect to the device's console port (9600, 8, N, 1, None)
- Reboot or power on the device
- Enter ROM Monitor Mode (aka ROMmon) by entering a suitable Terminal Break Sequence
- Change the Configuration Register to 0x2142 using this command: confreg 0x2142
- Reboot - The device will boot without using it's startup configuration and will be in it's factory default configuration
- Copy the startup config to the running config using this command: copy start run
- Change the enable password and/or secret as appropriate using commands: enable password and/or enable secret
- Change the Configuration Register back to 0x2102 using this command: configuration-register 0x2102
- Save the running configuration to the start up configuration using this command: copy run start
Usage Notes
If you're having trouble entering ROMmon mode refer to the Terminal Break Sequence article for assistance. Also note on some switches pressing and holding down the mode button on the device during boot up performs the same function.
Related Articles
See the Cisco Rollover Cable Specifications article for detailed information on the cable required to connect to the serial or RJ45 console port
See the Configuration Register article for more information on possible values for the register
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