Core switch will do the routing. That 2 units of core switch (HA) will run as virtual switch.
For a start my customer environment only can support AOS 6.5 for Aruba 7205 controller because has AP105 on the network and have make sure it stable after migrate from Aruba 3400 (AOS 6.4). Then confirm is stable then upgrade again to AOS 8.x
When upgrade from AOS 6.5 to AOS 8.x does it still able to configure as Active-Active?