What kind of IOS verison I will need for my 6509 switch in order to fulfil the requirments below. There are so much to pick from but need little recommendation.
from there you can choose to use 19 or 20, currently the latest is 12.1(20)E2
I don't recommend other IOS than 12.1E, those are for specific new applications such as VPN, SUP720, etc.
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