Cisco 3700 Series Hardware Installation Manual page 99

Appendix B Using the ROM Monitor
In either case, the new configuration register value is written into NVRAM, but is not effective until you
reboot (using the ROM monitor reset command) or power cycle the router.
Modifying the Configuration Register in Menu Mode
Entering the confreg command without an argument displays the contents of the configuration register,
and prompts you to alter the contents by describing the meaning of each bit.
Modifying the Configuration Register by Hexadecimal Entry
Entering the confreg command plus a hexadecimal value changes the contents of the configuration
register. The syntax is confreg [hexnum]; values entered are always interpreted as hexadecimal. The
following example changes the value of the configuration register to the factory default:
rommon 7> confreg 0x2102
You must reset or power cycle the router for new configuration to take effect.
OL-2180-08
The following display shows an example of menu mode:
rommon 7 > confreg
Configuration Summary
enabled are:
break/abort has effect
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n
enable "diagnostic mode"? y/n
enable "use net in IP bcast address"? y/n
enable "load rom after netboot fails"? y/n
enable "use all zero broadcast"? y/n
disable "break/abort has effect"? y/n
enable "ignore system config info"? y/n
change console baud rate? y/n
enter rate: 0 = 9600,
4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200
change the boot characteristics? y/n
enter to boot:
0 = ROM Monitor
1 = the boot helper image
2-15 = boot system
[0]: 0
Configuration Summary
enabled are:
diagnostic mode
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n
You must reset or power cycle for new config to take effect
[n]: y
[n]:
[n]:
[n]:
[n]:
[n]:
[n]: y
1 = 4800, 2 = 1200, 3 = 2400
[n]: y
Cisco 3700 Series Routers Hardware Installation Guide
ROM Monitor Command Descriptions
[n]: y
[0]: 0
[n]:
B-7