Configuration Register Commands - Cisco 2691 - VPN Bundle Router Hardware Installation Manual

Appendix B Using the ROM Monitor
•

Configuration Register Commands

The configuration register resides in NVRAM. You can view or modify the configuration register from
either the ROM monitor or the operating system software.
For procedures used to change the configuration register from the operating system, and for information
about configuration register settings, see
To modify the configuration register from the ROM monitor, you can:
•
•
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 the confreg command:
rommon 7> confreg
enabled are:
break/abort has effect
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n
enable
enable
enable
enable
disable "break/abort has effect"? y/n
enable
change console baud rate? y/n
enter rate: 0 = 9600,
change the boot characteristics? y/n
OL-2171-06
sysret—Views return information from the last booted system image. This information includes the
reason for terminating the image, a stack dump of up to eight frames, and, if an exception is
involved, the address where the exception occurred. For example:
rommon 8> sysret
System Return Info:
count: 19, reason: a SegV exception
pc:0x802b1040, error address: 0x802b1040
Stack Trace:
FP: 0x80908398, PC: 0x802b102c
FP: 0x809083b0, PC: 0x802b0b88
FP: 0x809083d8, PC: 0x8017039c
FP: 0x809083e8, PC: 0x8016f764
Enter the confreg command by itself for menu mode. See the
Register in Menu Mode" section below.
Enter the confreg command plus the new hexidecimal value of the configuration register. See the
"Modifying the Configuration Register by Hexidecimal Entry" section on page
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
"ignore system config info"? y/n
1 = 4800,
4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200
Appendix C, "Configuration Register."
[n]: y
[n]: y
[n]:
[n]:
[n]:
[n]:
[n]:
[n]: y
2 = 1200, 3 = 2400
[n]: y
Cisco 2600 Series Routers Hardware Installation Guide
ROM Monitor Command Descriptions
"Modifying the Configuration
B-8.
[0]: 0
B-7