Appendix; Using The Rom Monitor; Entering Rom Monitor Mode - Cisco 2691 - VPN Bundle Router Hardware Installation Manual

Using the ROM Monitor

This appendix describes the use of the ROM monitor (also called the bootstrap program), which is the
firmware that runs when you power up or restart a Cisco router. During normal operation, the ROM
monitor helps to initialize the processor hardware and boot the operating system software. You can also
use the ROM monitor to:
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This appendix contains the following sections:
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Entering ROM Monitor Mode

To use the ROM monitor, you must have access to the console port. Refer to the
Console Terminal or Modem" section on page 3-20
There are two ways of entering the ROM monitor mode:
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Note
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OL-2171-06
Help isolate hardware problems encountered when installing your router.
Download a new Cisco IOS image if the operating image is corrupted.
Entering ROM Monitor Mode, page B-1
ROM Monitor Commands, page B-2
ROM Monitor Command Syntax Conventions, page B-3
ROM Monitor Command Descriptions, page B-4
Recovering Cisco IOS Software Images, page B-8
Use the reload command and the Break key to enter the ROM monitor mode for one-time use.
Break (system interrupt) is always enabled for 60 seconds after the router reboots, regardless of
whether Break is configured on or off in the configuration register (see
Register."). During this 60-second period, you can break to the ROM monitor prompt by pressing
the Break key.
If your console terminal does not have a Break key, refer to the terminal emulator documentation
for instructions on generating a break (system interrupt).
Set the configuration register so that the router enters the ROM monitor mode whenever it boots.
The new configuration register value, 0x0, is effective after the router is rebooted with the reload
command. The router remains in the ROM monitor and does not boot the operating system.
A P P E N D I X
for information on connecting the console cable.
Cisco 2600 Series Routers Hardware Installation Guide
B
"Connecting to a
Appendix C, "Configuration
B-1