@pjc26.x will continue to get security and functional fixes, just not new major features. Hence the support up to 26.99 when we are only on 26.8.1 at the moment. I think that if you configure a network that has a mix of devices with 27.x then the newer devices will get 27.x and the older ones will get the latest 26.x. Obviously you cannot use new functional features that rely on 27.x. We have been doing a bit of rationalising and have been replacing the 802.11ac Wave 1 APs at sites with only a few with Wave 2 APs from sites where most are Wave 1, thereby allowing us to use the new features in the now all Wave 2 sites if required.
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