We recently upgraded our v2110 controller to the new Extreme V9.01.
Since the upgrade no IOS version 7 devices could connect.
We have a load group configured with band steering enbaled.
In the Ap logs I can see that the device tries to connect to the 2.4ghz radio but then get rejected so that it could move to the 5ghz radio.
The IOS devices can connect only when I disable band steering.
All other devices/Operating systems (Andriod and Windows) works fine with band steering enabled.