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Hardware Installation Guide for the Cisco 4451-X Integrated Services Router
Chapter 5 ROM Monitor Overview and Basic Procedures
Displaying the Configuration Register Setting
help monitor builtin command help
history monitor command history
meminfo main memory information
repeat repeat a monitor command
reset system reset
set display the monitor variables
showmon display currently selected ROM monitor
stack produce a stack trace
sync write monitor environment to NVRAM
sysret print out info from last system return
tsec print out info from the ethernet driver
unalias unset an alias
unset unset a monitor variable
Changing the ROM Monitor Prompt
You can change the prompt in ROM Monitor mode by using the PS1= command as shown in the
following example:
rommon 8 > PS1="ISR4400 rommon ! > "
ISR4400 rommon 9 >
Changing the prompt is useful if you are working with multiple routers in ROM Monitor at the same
time. This example specifies that the prompt is “” followed by the line number.
Displaying the Configuration Register Setting
To display the current configuration register setting, enter the confreg command without parameters as
follows:
rommon > confreg
Configuration Summary
(Virtual Configuration Register: )
enabled are:
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n [n]:
The configuration register setting is labeled Virtual Configuration Register. Enter the no command to
avoid changing the configuration register setting.
Environment Variable Settings
The ROM Monitor environment variables define the attributes of the ROM Monitor. Environmental
variables are entered like commands and are always followed by the equal sign (=). Environment variable
settings are entered in capital letters, followed by a definition. For example:
IP_ADDRESS=10.0.0.2