APs are managed by a ZD.
VLAN 2 is set as a "Management" VLAN, but there is also a VLAN 1 set a "Default" VLAN. The ZD and APs all have IP addresses in the "Management" VLAN.
There is a mix of Cisco/3COM switches. The ZD is connected to a Cisco SG300-28MP, port is set a "Trunk", native VLAN 2, tagged VLAN 71, 81 (two WLAN vlans). I have access points in this same switch, configured the same way, Native VLAN 2, Tagged 71, 81 and they all work just fine.
This Cisco switch connects to a 3COM 7700, which in turn connects to a 3COM 4400 in another wing of the building, I have port 2 UNTAGGED on the ports in the 4400 with Access points, and TAGGED 71,81, however, I cannot pick up DHCP on the WLAN 71/81 when I do this. There could be other issues with DHCP relay, though it appears that is all set up properly (again, not used to 3COM, so I may not have this correct).