Cisco 2431 - IAD Router User Manual

C-4
Cisco IAD2430 Series Integrated Access Devices Software Configuration Guide
OL-4306-03
Appendix C Using the ROM Monitor
Recovering Boot and System Images
Recovering Boot and System Images
If your router experiences difficulties and no longer contains a valid Cisco IOS software image in flash
memory, you can recover the Cisco
IOS image using one of the following ROM monitor commands:
• xmodem—Use this if the computer attached to your console has a terminal emulator that has
xmodem capability.
• tftpdnld -r—Use this if you have a TFTP server directly connected to a Fast Ethernet port.
Using the xmodem Command
The xmodem command establishes a connection between a console and the router console port for
disaster recovery if both the boot and system images are erased from flash memory.
xmodem [filename]—Establishes an xmodem connection between the console and the router. The
optional parameter argument filename specifies the source file containing the Cisco
IOS image.
Other options include the following:
• -c—Use cyclic redundancy check (CRC-16).
• -y—Use Ymodem transfer protocol.
• -r—Copy the image to DRAM for launch.
• -x—Do not launch image on completion of download.
Note The IAD2435 IAD ROMMON supports only -c and -y.
dir device: Lists the files on the named device; for example:
rommon 5 > dir flash:
Directory of flash:
2 1343152 -rw- c2430-advipservices-k9.mz
rommon 6 >
meminfo Lists the main memory information; for example:
rommon 6 > meminfo:
Main memory size: 256 MB.
Available main memory starts at 0x80018000, size 262048 KB
IO (packet) memory size: 5 percent of main memory
NVRAM size: 256 KB
boot commands For more information about the ROM monitor boot commands, see the Cisco IOS
Configuration Fundamentals and Network Management Guide.
b 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.
Table C-1 Commonly Used ROM Monitor Commands (continued)
Command Description

Cisco 2431 - IAD Router Specifications

General

Brand	Cisco
Model	2431 - IAD Router
Category	Network Hardware
Language	English