Upgrade Cisco switch from Standard image to Enhanced image.

When searching for switches for your home lab, you’ll often find listings on eBay for switches such as 
WS-C3560-24TS-S , WS-C3560-24PS-S , WS-C3560-48TS-S , WS-C3560-48PS-S.

However, for a CCIE lab you would need the enhanced “-E” version of these switches.
Purchasing a WS-C3560-24TS-E switch however, is not necessary.

You can upgrade a standard image with an enhanced image by using the following command:
#archive download-sw /allow-feature-upgrade /overwrite ftp://<image-location>

WS-C3560-48PS-S