I have a WS-C3750G-24T-E that is currently running the following version of IOS which I believe is an EMI image; c3750-i5-mz.121-19.EA1d.
Now, I would like to upgrade this to gain some of the additional features, especially around port security, but have been very confused by the feature sets. If I use the software advisor and select the EMI feature set I get directed to download c3750-i5-mz.12.2-20.SE3 which is not available.
Can anyone please help me to understand what these feature sets are and which ones are compatible with my hardware.
Thanks in advance,
You happened to have picked an IOS version that has been retired by Cisco that is all.
You just need to choose a different one. For example a quick search on Feature Navigator shows that this one would meet your requirements
However i would recommend you use feature navigator to find the exact IOS you want
and then "Search by Platform"