Cisco Systems OL-6426-02 Benutzerhandbuch

 describes the most commonly used ROM monitor commands.

The standard way to load new software on your router is to use the copy tftp flash privileged EXEC 
command from the Cisco IOS software command-line interface (CLI). However, if the router is unable 
to boot Cisco IOS software, you can load new software while in ROM monitor mode.

This section describes how to load a Cisco IOS software image from a remote TFTP server to the router 
flash memory. Use the tftpdnld command only for disaster recovery, because it erases all existing data 
in flash memory before downloading a new software image to the router.

This section describes the system variables that can be set in ROM monitor mode and that are used 
during the TFTP download process. There are both required variables and optional variables. 

help or ?

Displays a summary of all available ROM monitor commands.

Displays information about command syntax; for example:

rommon 16 > dis -?

usage : dis [addr] [length]

The output for this command is slightly different for the xmodem download 
command:

rommon 11 > xmodem -?

xmodem: illegal option -- ?

usage: xmodem [-cyrxu] <destination filename>

-c  CRC-16

-y  ymodem-batch protocol

-r  copy image to dram for launch

-x  do not launch on download completion

-u  upgrade ROMMON, System will reboot after upgrade

reset or i

Resets and initializes the router, similar to a power up.

dir device:

Lists the files on the named device; for example, flash memory files:

rommon 4 > dir flash:

Directory of flash:/

2 -rwx 10283208 <date> c1800-advsecurityk9-mz

9064448 bytes available (10289152 bytes used)

boot commands

For more information about the ROM monitor boot commands, see the

Boots the first image in flash memory.

b flash: [filename] Attempts to boot the image directly from the first partition of flash memory. If you 

do not enter a filename, this command will boot this first image in flash memory.