Entering Rom Monitor Mode; Checking The Current Rommon Version - Cisco 4451-X Hardware Installation Manual

Chapter 5 ROM Monitor Overview and Basic Procedures
Administration EXEC mode as needed. Typically, you set the configuration register using the
Cisco IOS XE software prompt when you need to use ROM Monitor mode. When the maintenance in
ROM Monitor mode is complete, you change the configuration register so the router reboots with the
Cisco IOS XE software.
Accessing ROM Monitor Mode with a Terminal Connection
When the router is in ROM Monitor mode, you can access the ROM Monitor software only from a
terminal connected directly to the console port of the card. Because the Cisco IOS XE software (EXEC
mode) is not operating, the nonmanagement interfaces are not accessible. Basically, all
Cisco IOS XE software resources are unavailable. The hardware is there, but no configuration exists to
make use of the hardware.
Network Management Access and ROM Monitor Mode
Checking the Current ROMmon Version, page
ROM Monitor mode. It is important to remember that ROM Monitor mode is a router mode, not a mode
within the Cisco IOS XE software. It is best to remember that ROM Monitor software and the
Cisco IOS XE software are two separate programs that run on the same router. At any given time, the
router is running one of these programs, but it never runs both at the same time.
One area that can be confusing when using ROM Monitor and the Cisco IOS XE software is the area that
defines the IP configuration for the Management Ethernet interface. Most router users get comfortable
with configuring the Management Ethernet interface in the Cisco IOS XE software. When the router is
in ROM Monitor mode, however, the router is not running the Cisco IOS XE software, so that
Management Ethernet interface configuration is not available.
When you want to access other devices, such as a TFTP server, while in ROM Monitor mode on the
Cisco 4451-X ISR, you must configure the ROM Monitor variables with IP access information.

Entering ROM Monitor Mode

The following sections describe how to enter the ROMMON mode, and contains the following sections:
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Checking the Current ROMmon Version

To display the version of ROMmon running on a router, use the show rom-monitor command or the
show platform command.
Router# show rom-monitor r0
Router#show rom-monitor r0
System Bootstrap, Version 12.2(20120829:165313) [jhayduk-ESGROM_20120829_DELTA 101],
DEVELOPMENT SOFTWARE
Copyright (c) 1994-2012
Router#show platform
Chassis type: ISR4451/K9
Checking the Current ROMmon Version, page 5-2
Commonly Used ROM Monitor Commands, page 5-4
Displaying the Available ROM Monitor Commands, page 5-4
Changing the ROM Monitor Prompt, page 5-5
by cisco Systems, Inc.
5-2. Some people get confused when they start to use
Hardware Installation Guide for the Cisco 4451-X Integrated Services Router
Entering ROM Monitor Mode
5-2