Cisco CRS-1 - Carrier Routing System Router Getting Started Manual page 211

ROM Monitor Guide
The ROM monitor is a bootstrap program that initializes the hardware and boots the
Cisco IOS XR software when you power on or restart a Cisco CRS-1 router. ROM monitor mode is also
known as "ROMMON," which reflects the command-line interface (CLI) prompt for the mode:
rommon B1>
During normal operation, users do not interact with ROMMON. This mode is accessed only by manually
interrupting the boot process and placing the system in ROMMON. Once the system is in ROMMON,
you can perform ROM monitor tasks, including reinstalling the Cisco IOS XR software, recovering
passwords, and performing other diagnostic tasks.
The ROM monitor mode is accessible only from a terminal connected directly to the Console port of the
primary or standby Route Processor (RP). This chapter describes the procedures to enter ROM monitor
mode and perform the most common ROM monitor tasks.
Contents
This chapter contains the following sections:
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Entering ROM Monitor Mode
The following sections describe two ways to enter ROM monitor mode:
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Entering ROM Monitor Mode, page A-1
Setting Configuration Register Values, page A-6
Reinstalling the Cisco IOS XR Software from ROMMON, page A-9
Specifying an Alternative Configuration, page A-24
Disaster Recovery, page A-25
Recovering the Root Password, page A-26
Displaying the Available ROM Monitor Commands and Options, page A-26
Exiting ROM Monitor Mode, page A-27
Resetting the Configuration Register and Reloading the Router, page A-2
Manually Halting the Initialization Process During System Reload, page A-5
A P P E N D I X
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
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