A-3
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
Appendix A ROM Monitor Guide
Entering ROM Monitor Mode
DETAILED STEPS
Command or Action Purpose
Step 1
Verify the router is in a steady state, as described in the
“Prerequisites” section on page A-2.
Ensures that all configurations are saved, and that no
install processes are running.
Step 2
Connect a terminal to the primary RP console port and log
into the router.
Connects a terminal or PC to the primary RP console
port and establishes a router management session.
• See the “Connecting and Communicating with
the Router” section on page 2-1 for more
information on connecting a terminal.
Step 3
configure
Example:
RP/0/RP0/CPU0:router# configure
Enters global configuration mode.
Step 4
config-register 0x0
Example:
RP/0/RP0/CPU0:router(config)# config-register 0x0
Resets the configuration register to 0x0 in the
running configuration.
• See the “Setting Configuration Register Values”
section on page A-6 for more information.
Caution Resetting the configuration register may
change the baud rate for the console.
Note Setting the configuration register to 0x0
causes the system to enter ROM monitor
mode during a reload.
Step 5
commit
Example:
RP/0/RP0/CPU0:router(config)# commit
Saves the changes to the running configuration.
Caution You must commit the setting and enter the
no config-register 0x0 command for the
settings to take effect. Refer to DDTS
CSCec84700 for more information on this
requirement.
Step 6
no config-register 0x0
Example:
RP/0/RP0/CPU0:router(config)# no config-register 0x0
Prevents unwanted changes to the configuration
register at a later point, and guarantees the setting is
the same between the Cisco IOS XR software and
the ROM monitor of the Cisco CRS-1 router.
Note Refer to DDTS CSCec84700 for more
information on this requirement.
Step 7
commit
Example:
RP/0/RP0/CPU0:router(config)# commit
Saves the changes to the running configuration.
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