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Cisco uBR924 Software Configuration Guide
OL-0337-05 (8/2002)
APPENDIX
C
Using the ROM Monitor
This appendix describes the Cisco uBR924 cable access router ROM monitor, which helps you isolate
and troubleshoot possible hardware problems when installing the router. The ROM monitor is the first
software to run when the Cisco uBR924 router is powered-on or reset; it is permanently part of the
Cisco uBR924 router and is always available, regardless of the release of Cisco IOS software that has
been downloaded to the router.
This appendix describes:
• Entering the ROM Monitor, page C-1
• Command Conventions, page C-2
• Commands, page C-2
Caution Users and system administrators do not need to access the ROM monitor during normal operation of the
Cisco uBR924 router. The ROM monitor should be used only by trained service technicians or under the
direction of a Cisco TAC engineer. Many of the commands available in the ROM monitor put the router
in a diagnostic or non-functional state—do not enter any commands in the ROM monitor unless you
thoroughly understand their function and how to reverse their effects so you can restore the router to
normal operations.
Entering the ROM Monitor
The ROM monitor initializes the processor hardware and boots the main operating system software. The
ROM monitor version introduced in the Cisco IOS Release 12.0(4)XI timeframe displays as follows:
rommon 2 > i
System Bootstrap, Version 12.0(19990506:181223)[sjacobso-jac-xi26 2504] DEVELOPMENT
SOFTWARE
Copyright (c) 1994-1999 Cisco Systems, Inc.
UBR924 platform with 16384 Kbytes of main memory
The ROM monitor main memory information is shown below:
rommon 3 > meminfo
Main memory size: 16 MB
Available main memory starts at 0x14000, size 16304 KB
I/O (packet) memory size: 512 KB
NVRAM size: 16 KB
To default to booting at the ROM monitor while running the system software, reset the configuration
register to 0x0 by entering the following Cisco IOS global configuration command: