Cisco 1801, Configuration Manual

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C-2
Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
OL-6426-02
Appendix C ROM Monitor
ROM Monitor Commands
Timesaver
Break (system interrupt) is always enabled for 60 seconds after the router reboots, regardless of whether
it is set to on or off in the configuration register. During this 60-second window, you can break to the
ROM monitor prompt by pressing the Break key.
ROM Monitor Commands
Enter ? or help at the ROM monitor prompt to display a list of available commands and options, as
follows:
rommon 1 >
?
alias set and display aliases command
boot boot up an external process
break set/show/clear the breakpoint
confreg configuration register utility
cont continue executing a downloaded image
context display the context of a loaded image
cookie display contents of cookie PROM in hex
dir List files in directories-dir <directory>
dis display instruction stream
format Format a filesystem-format <filessystem>
frame print out a selected stack frame
fsck Check filesystem consistency-fsck <filesystem>
help monitor builtin command help
history monitor command history
meminfo main memory information
more Concatenate (type) file(s)-cat <filenames ...>
repeat repeat a monitor command
reset system reset
set display the monitor variables
stack produce a stack trace
sync write monitor environment to NVRAM
sysret print out info from last system return
tftpdnld tftp image download
unalias unset an alias
unset unset a monitor variable
xmodem x/ymodem image download
Commands are case sensitive. You can halt any command by pressing the Break key on a terminal. If
you are using a PC, most terminal emulation programs halt a command when you press the Ctrl and the
Break keys at the same time. If you are using another type of terminal emulator or terminal emulation
software, see the documentation for that product for information on how to send a Break command.
Step 4
exit Exits global configuration mode.
Step 5
reload Reboots the router with the new configuration register value. The router
remains in ROM monitor and does not boot the Cisco IOS software.
As long as the configuration value is 0x0, you must manually boot the
operating system from the console. See the
boot command in the “ Command
Descriptions ” section in this appendix.
After the router reboots, it is in ROM monitor mode. The number in the
prompt increments with each new line.
Command Purpose