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One significant difference would be FlexStack vs. FlexStack Plus
The difference between the models you stated is so significant in terms of hardware and software, the catalyst 2960X is and enhanced version of the previous one, cat2060S. You can find all the difference in this 2960X Q&A link (go to table 2). Which also compare the 2960-XR, 2960-X, 2960-S and 2960.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...