Environment- This article applies to controller running 18.104.22.168 code
Answer- From 6.4.3, the following products will support mesh function: ap27X, ap22x, ap21x, ap20x
Backward compatibility with 11n AP
If two mesh APs are 11ac AP, the mesh link support 11AC feature
If two mesh APs are 11n AP, the mesh link support 11N feature
If one mesh AP support 11n and other mesh AP support 11ac, the mesh link support 11n feature.