3
Using the ROM Monitor
OL-5997-02
How to Use the ROM Monitor—Typical Tasks
–
TFTP download (
tftpdnld
)—Use this method if you can connect a TFTP server directly to the
fixed LAN port on your router. See the
“Recovering the System Image (tftpdnld)” section on
.
Note
Recovering the system image is different from upgrading the system image. You need to
recover the system image if it becomes corrupt or if it is deleted because of a disaster that
affects the memory device severely enough to require deleting all data on the memory device
in order to load a system image.
Tips for Using ROM Monitor Commands
•
ROM monitor commands are case sensitive.
•
You can halt any ROM monitor command by entering the Break key sequence (
Ctrl-Break
) on the
PC or terminal. The Break key sequence varies, depending on the software on your PC or terminal.
If
Ctrl-Break
does not work, see the
Standard Break Key Sequence Combinations During Password
tech note.
•
To find out which commands are available on your router and to display command syntax options,
see the
“Displaying Commands and Command Syntax in ROM Monitor Mode (?, help, -?)” section
.
Accessibility
This product can be configured using the Cisco command-line interface (CLI). The CLI conforms to
accessibility code 508 because it is text based and because it relies on a keyboard for navigation. All
functions of the router can be configured and monitored through the CLI.
For a complete list of guidelines and Cisco products adherence to accessibility, see Cisco Accessibility
Products at the following URL:
http://www.cisco.com/web/about/responsibility/accessibility/products
How to Use the ROM Monitor—Typical Tasks
This section provides the following procedures:
•
Entering ROM Monitor Mode, page 5
•
Displaying Commands and Command Syntax in ROM Monitor Mode (?, help, -?), page 8
•
Displaying Files in a File System (dir), page 10
•
Loading a System Image (boot), page 10
•
Downloading Files over the Router Console Port (xmodem), page 15
•
Modifying the Configuration Register (confreg), page 16
•
Obtaining Information on USB Flash Devices, page 18
•
Modifying the I/O Memory (iomemset), page 19
•
Recovering the System Image (tftpdnld), page 20
•
Troubleshooting Crashes and Hangs (stack, context, frame, sysret, meminfo), page 24