Recovering Compact Flash Memory and System Images
If you have increased system compact flash memory or reduced DRAM or SDRAM in a Cisco 3700
series router, you might need to reload the Cisco IOS image, using the xmodem command in ROM
monitor mode. To use this command, the computer attached to your console must have a terminal
emulator that has xmodem capability.
For complete information about ROM monitor commands, refer to Software Configuration Guide for
Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers, available online at the following
URL:
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_mod/index.htm
Using the xmodem Command
If the system image is erased from compact flash memory, the xmodem command establishes a
connection between a console and the router console or auxiliary port for disaster recovery.
xmodem [filename]—Establishes an xmodem connection between the console and the router. The
optional argument filename specifies the source file containing the Cisco IOS image.
Other options are:
-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.
Obtaining Documentation
Cisco documentation and additional literature are available on Cisco.com. Cisco also provides several
ways to obtain technical assistance and other technical resources. These sections explain how to obtain
technical information from Cisco Systems.
Cisco.com
You can access the most current Cisco documentation at this URL:
http://www.cisco.com/univercd/home/home.htm
You can access the Cisco website at this URL:
http://www.cisco.com
You can access international Cisco websites at this URL:
http://www.cisco.com/public/countries_languages.shtml
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Recovering Compact Flash Memory and System Images
Upgrading System Memory in Cisco 3700 Series Routers
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