How to change IP addresses of APs and WLC to the ones from different VLAN

I'm trying to figure out what is the best practice to change IP addresses on all my access points connected/managed by the WLC.
I have one WLC2504 controler and three AIR-LAP1041N access points the idea is to change management IP of the WLC from 192.168.2.100 (vlan1) to 192.168.12.100 (vlan79) and all access points accordingly:
ap1 192.168.2.101 (vlan1) to 192.168.12.101 (vlan79)
ap2 192.168.2.102 (vlan1) to 192.168.12.102 (vlan79)
ap3 192.168.2.103 (vlan1) to 192.168.12.103 (vlan79)
FYI all my APs obtain IP from DHCP server which sits in the vlan1 and each AP is connected to trunk port on Catalyst switch, trunk port (vlan1, vlan79, vlan80, vlan81, vlan82) carries traffic for different WLANs, so my question is what is the best way to change management IP on each device with the minimal downtime.
Thank you for your advice,
Luu Manioro

Well, you will have downtime anyways, but how I would do this is the following:
Make sure the WLC trunk port has vlan 79 being allowed
Change the high availability on each AP to point to the hostname of the WLC and the new ip address, you don't need the old ip address anymore
Console into the WLC or use the service port and change the management ip address and at the same time if possible, move the AP's to the new vlan 79, since they have already joined the WLC, they will know of the ip address of the WLC
Reboot the AP by shutting down the PoE port or powering off/on the AP
The AP will find the WLC since you have defined the high availability and also since the AP and WLC are on the same subnet.
Scott

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