Recovering Cisco Ios Software Images - Cisco 2691 - VPN Bundle Router Hardware Installation Manual

Recovering Cisco IOS Software Images

enter to boot:
0 = ROM Monitor
1 = the boot helper image
2-15 = boot system
enabled are:
diagnostic mode
break/abort has effect
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n
You must reset or power cycle for new config to take effect
Modifying the Configuration Register by Hexidecimal Entry
Entering the confreg command plus a hexidecimal value changes the contents of the configuration
register. The syntax is confreg [hexnum]; values entered are always interpreted as hexadecimal. The
following example changes the value of the configuration register to the factory default:
rommon 7> confreg 0x2102
You must reset or power cycle the router for new configuration to take effect.
Recovering Cisco IOS Software Images
If your Cisco router experiences difficulties and no longer contains a valid Cisco IOS software image in
flash memory, you can download a new Cisco IOS image using one of the following ROM monitor
commands:
•
•
Cisco 2600 Series Routers Hardware Installation Guide
B-8
[0]: 0
Configuration Summary
xmodem—(All Cisco 2600 series routers) Use this command to copy a Cisco IOS image from the
console, if the computer attached to your console has a terminal emulator with Xmodem capability.
See the "Copying an Image from the Console Using the xmodem Command" procedure on
page B-9.
Note
Downloading a Cisco IOS image from a console is very slow. This procedure should be used
only in an emergency and is not recommended for normal Cisco IOS image upgrades.
For the fastest possible download from a console, set the console speed to 115200 bps by
using the confreg ROM monitor command. See the
procedure on page
tftpdnld—(Except Cisco 2691) Use this command to copy a Cisco IOS image from a TFTP server
that is accessible through the FastEthernet 0/0, Ethernet 0/0, or Token Ring 0/0 port. See the
"Copying an Image from a TFTP Server Using the tftpdnld Command" procedure on page
[n]:
B-7.
Appendix B Using the ROM Monitor
"Configuration Register Commands"
B-10.
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