Cisco Systems VG224 ROM Monitor Commands, Configuring, Verifying, Command or Action, Purpose

Appendix C Using the ROM Monitor

Entering the ROM Monitor Mode

To enter the ROM monitor mode, do the following:

Configuring

	Command or Action	Purpose
Step 1
	Router> reload	Restarts the Cisco VG224.
Step 2
	Press the Break key during the first 60 seconds while	Forces the router to stop booting
	the system is starting up.	and enter the ROM monitor mode.

Verifying

To verify that you are in ROM monitor mode, check that the prompt displayed on your screen is the ROM monitor mode prompt:

rommon # >

The # is the line number and increases incrementally at each prompt.

Tip From the Cisco IOS software, you can configure the router to automatically enter the ROM monitor mode the next time the router boots by setting virtual configuration register bits 3, 2, 1, and 0 to zero. From the console, enter the following configuration command:

configuration-register 0x0

The new configuration register value, 0x0, is effective after the router is rebooted with the reload command. The router remains in ROM monitor and does not boot the operating system.

As long as the configuration register value remains 0x0, you must manually boot the operating system from the console. Refer to the boot command in the section “Command Descriptions” later in this appendix.

ROM Monitor Commands

Enter ? or help at the ROM monitor mode prompt to display a list of available commands. For example:

	rommon 1 >	?
	alias	set and	display aliases command
	boot	boot up	an external process
	break	set/show/clear the breakpoint
	confreg	configuration register utility
	cont	continue executing a downloaded image
	context	display	the context of a loaded image
	cookie	display	contents of cookie PROM in hex
	dev	list the device table
	dir	list files in the file system
	dis	display	instruction stream
	dnld	serial download a program module
	frame	print out a selected stack frame
	fpga-pref	select an FPGA
	help	monitor	builtin command help
	history	monitor	command history
	meminfo	main memory information
	repeat	repeat a monitor command
	Cisco VG224 Voice Gateway Software Configuration Guide
C-2			OL-5005-01