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Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers

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Appendix C Using the ROM Monitor

Entering the ROM Monitor Mode

Debugging Commands

Most debugging commands are functional only when Cisco IOS software has crashed or is aborted. If

you enter a debugging command and Cisco IOS crash information is not available, the following error

message displays:

“xxx: kernel context state is invalid, can not proceed.”

• stack or k—Produce a stack trace.

• context—Display processor context.

• frame—Display an individual stack frame.

• sysret—Display 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

Configuration Register Commands

The virtual configuration register resides in NVRAM. You can display or modify the virtual

configuration register from either the ROM monitor or the operating system software.

To change the virtual configuration register from the ROM monitor, enter confreg by itself for menu

mode, or enter the new value of the register in hexadecimal.

• confreg [hexnum]—Change the virtual configuration register to the value specified. The value is

always interpreted as hexadecimal.

Note Entering confreg without an argument displays the contents of the virtual configuration register and

prompts you 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 is not effective until you reset or

power-cycle the router.

The following display shows an example of the confreg command:

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]:

1 2 ... 182 183 184 185 186 187 188 189 190 191 192 ... 197 198

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