> A while back I read about a utility that would compress an IOS image,
> but still allow you to use it. I found that I had archived a copy on a
> CD, so I tried it out. It compressed a 14MB image down to 4.5MB. I
> TFTP'd the compressed image to my 2524 and it rebooted. Upon reboot,
> however, it wouldn't boot from the image.
>
> I don't recall what the error message was (something along the lines of
> bad CRC), so I removed that image and replaced it with an uncompressed
> IOS. Has anyone else used this or a similar program? I'm including a
> link to the file. I'm told it's freeware. The link is only up for a
> week or so, but it's on my public share (rtimmons) at xdrive.com, and
> I'll leave it there indefinitely. I don't have any documentation for
> this product.
Yes.
Even Cisco's "run from flash" hardware (2500, old 1600, etc)
will boot a compressed image in to RAM. This is an "undocumented
feature". MZMAKER.EXE uses the same algorithm as the unix-based
"compress" tool. I've used this (compress, not MZMAKER) on
numerous IOS images, and never had anything but success.
Usually, though, if I'm looking to skimp on flash for lab
purposes I'd just end up using a tftp server.
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