Installation guide

APPENDIX
Cisco 4500-M and Cisco 4700-M ROM Monitor F-1
F
Cisco 4500-M and
Cisco 4700-M ROM Monitor
This appendix describes the Cisco 4500-M and Cisco 4700-M ROM monitor, the first
software to run when the router is powered up or reset. The Cisco 4500-M and
Cisco 4700-M ROM monitor supports more features than the familiar Cisco 4000-M ROM
monitor. The ROM Monitor can help you isolate or rule out hardware problems
encountered when installing your router. A summary of the ROM monitor diagnostic tests
and command options is provided.
Entering the ROM Monitor Program
The ROM monitor diagnostics help initialize the processor hardware and boot the main
operating system software. If you set the software configuration register (bits 3, 2, 1, and
0) to zero, you can start the router in the standalone ROM monitor. An example of the
Cisco 4500-M and Cisco 4700-M ROM monitor prompt follows:
rommon 1 >
To enable Break and to default to booting at the ROM monitor while running the system
software, reset the configuration register to 0x0 by entering configuration mode, then enter
the following configuration command:
config-reg 0x0
The new configuration register value, 0x0, takes effect after the router is rebooted when you
enter the reload command. If you set the configuration to 0x0, you will have to manually
boot the system from the console each time you reload the router.