Confreg command

From RZWiki

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.

Usage Syntax

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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

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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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