Confreg command
From NetworkCommands
A command available on most Cisco IOS based platforms; used to display and modify the numerical value of the Configuration Register at the ROM Monitor Mode command line.
See the confreg command, Cisco ASA command for information on the Cisco ASA platform command of the same name.
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Usage Syntax
confreg [value]
Usage Examples
confreg - display current configuration register value and prompt to change it's value
confreg 0x2142 - change the value of the configuration register to the specified value: 0x2142 (as normally used for password recovery)
Usage Notes
If you modify the configuration register value you will need to reboot in order for the change to take affect, use the reset command
Typical Output
rommon 1 > confreg Configuration Summary enabled are: load rom after netboot fails console baud: 9600 boot: the ROM Monitor do you wish to change the configuration? y/n [n]: y enable "diagnostic mode"? y/n [n]: n enable "use net in IP bcast address"? y/n [n]: n disable "load rom after netboot fails"? y/n [n]: n enable "use all zero broadcast"? y/n [n]: n enable "break/abort has effect"? y/n [n]: n enable "ignore system config info"? y/n [n]: n change console baud rate? y/n [n]: n change the boot characteristics? y/n [n]: y enter to boot: 0 = ROM Monitor 1 = the boot helper image 2-15 = boot system [0]: 2 Configuration Summary enabled are: load rom after netboot fails console baud: 9600 boot: image specified by the boot system commands or default to: cisco2-C4500 do you wish to change the configuration? y/n [n]: y You must reset or power cycle for new config to take effect rommon 2 >
Related Commands
Use the show version command to view the value of the Configuration Register during normal operation
Use the configuration-register command to modify the value of the Configuration Register during normal operation
Related Articles
Further information on the Configuration Register and ROM Monitor Mode
Information on other ROMMon mode commands 
Information on other Cisco commands
Information on Vyatta commands 
Information on Extreme commands 
Information on Linux commands 
Information on F5 BigIP commands 
Information on Blue Coat SGOS commands
Information on Nokia IPSO commands
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