Configuration Register; Changing The Configuration Register Manually; Changing The Configuration Register Using Prompts - Cisco 2431 - IAD Router Software Configuration Manual

Configuration Register

Configuration Register
The virtual configuration register is in nonvolatile RAM (NVRAM) and has the same functionality as
other Cisco routers. You can view or modify the virtual configuration register from either the ROM
monitor or the operating system software. Within the ROM monitor, you can change the configuration
register by entering the register value in hexadecimal format, or by allowing the ROM monitor to prompt
you for the setting of each bit.

Changing the Configuration Register Manually

To change the virtual configuration register from the ROM monitor manually, enter the confreg
command followed by the new value of the register in hexadecimal format, as shown in the following
example:
rommon 1 > confreg 0x2101
You must reset or power cycle for new config to take effect
rommon 2 >
The value is always interpreted as hexadecimal. The new virtual configuration register value is written
into NVRAM but does not take effect until you reset or reboot the router.

Changing the Configuration Register Using Prompts

Entering the confreg command without an argument displays the contents of the virtual configuration
register and a prompt to alter the contents by describing the meaning of each bit.
In either case, the new virtual configuration register value is written into NVRAM but does not take
effect until you reset or reboot the router.
The following display shows an example of entering the confreg command:
rommon 7> confreg
enabled are:
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n
enable
enable
enable
enable
enable
enable
change console baud rate? y/n
enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400
change the boot characteristics? y/n
enter to boot:
0 = ROM Monitor
1 = the boot helper image
2-15 = boot system
Configuration Summary
Cisco IAD2430 Series Integrated Access Devices Software Configuration Guide
C-6
Configuration Summary
"diagnostic mode"? y/n
"use net in IP bcast address"? y/n
"load rom after netboot fails"? y/n
"use all zero broadcast"? y/n
"break/abort has effect"? y/n
"ignore system config info"? y/n
[0]: 0
[n]: y
[n]: y
[n]:
[n]:
[n]:
[n]:
[n]:
[n]: y
[0]:
[n]: y
Appendix C Using the ROM Monitor
0
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