Appendix B Using the ROM Monitor

ROM Monitor Command Descriptions

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.

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

[n]: y

enable

 

“diagnostic mode”? y/n

[n]:

y

 

enable

 

“use net in IP bcast address”? y/n

[n]:

enable

 

“load rom after netboot fails”? y/n

[n]:

enable

 

“use all zero broadcast”? y/n

[n]:

 

disable

 

“break/abort has effect”? y/n

[n]:

 

enable

 

“ignore system config info”? y/n [n]:

change

console baud rate? y/n

[n]: y

 

 

enter rate: 0 = 9600, 1 = 4800, 2 = 1200,

3 = 2400

 

 

4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200 [0]: 0

change

the boot characteristics? y/n

[n]:

y

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 [n]:

You must reset or power cycle for new config to take effect

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.

Cisco 3700 Series Routers Hardware Installation Guide

 

OL-2180-08

B-7

 

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Cisco Systems 3700 Series manual Modifying the Configuration Register in Menu Mode

3700 Series specifications

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