Understanding the network.pdf - Back to Home

to xmodem or TFTP (2600 only) an IOS image into the router's DRAM.
To use this option, you need to be in rommon and connected to the
console port, which is where you will be if there is an IOS load failure.
The xmodem method loads the IOS image from the system you're
using to display the console over the console serial connection. This
means you need to use a communication package that can perform
xmodem (or ymodem) file transfers. Sorry, C-Kermit is not well suited
for this. On PCs, I recommend ProCOMM. On Macintosh, use Z-term
(it's shareware and easy to get on AOL or the Web).
After you are on the console and have the IOS image you want to use,
type at the rommon prompt:
rommon 3 > xmodem -yr c3620-i-mz.113-9.bin
This executes an xmodem download using the ymodem (1K) transfer
protocol (ymodem is much faster than xmodem, if you can use it) to
boot the router, using the downloaded image after the transfer is
finished. You also need to set the name of the file you are
downloading, which in this case is . After
you have entered the command, you will be greeted with the
following:
Invoke this application only for disaster recovery.
Do you wish to continue? y/n [n]: y
Ready to receive file …
After you reply yes, rommon tells you it's ready to receive the file. At
this point you should start downloading the IOS image with your
communications package. An IP-only IOS image (about 2.5MB) will
take an hour to download. When completed, you will get an
acknowledgement message, then the IOS image will decompress and
load itself into DRAM and the router will come online:
### Send (Y) c3620-i-mz.113-9.bin: 2771280 bytes, 52:41
elapsed, 876 cps,