Cisco Systems OL-6426-02 Benutzerhandbuch

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. 

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. 

Exits global configuration mode.

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 “

” section in this appendix. 

After the router reboots, it is in ROM monitor mode. The number in the 
prompt increments with each new line.