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Entering the ROM Monitor Mode
Tip
From the Cisco IOS software, you can configure the router to automatically enter the ROM monitor
mode the next time the router boots by setting virtual configuration register bits 3, 2, 1, and 0 to zero.
From the console, enter the following configuration command:
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.
As long as the configuration register value remains 0x0, you must manually boot the operating system
from the console. Refer to the boot command in the section "Command Descriptions" later in this
appendix.
ROM Monitor Commands
Enter ? or help at the ROM monitor mode prompt to display a list of available commands. For example:
rommon 1 >
alias
boot
break
confreg
cont
context
cookie
dev
dir
dis
dnld
frame
help
history
meminfo
repeat
reset
set
stack
sync
sysret
tftpdnld
unalias
unset
xmodem
rommon 2 >
You can abort any command by pressing the Break key at the console.
Note
ROM Monitor Syntax Conventions
The ROM monitor syntax in this appendix uses the following conventions:
•
•
Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
C-2
configuration-register 0x0
?
set and display aliases command
boot up an external process
set/show/clear the breakpoint
configuration register utility
continue executing a downloaded image
display the context of a loaded image
display contents of cookie PROM in hex
list the device table
list files in the file system
display instruction stream
serial download a program module
print out a selected stack frame
monitor builtin command help
monitor command history
main memory information
repeat a monitor command
system reset
display the monitor variables
produce a stack trace
write monitor environment to NVRAM
print out info from last system return
tftp image download
unset an alias
unset a monitor variable
x/ymodem image download
Square brackets [ ] denote an optional element. In the following example, the element abc is not
required, but you can specify it if you choose:
command [abc]
Appendix C
Using the ROM Monitor
OL-1957-03
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