Changing DHCP server for APs

[eunrein]

We are migrating DHCP servers for our wireless infrastructure, and I have some questions regarding the behavior of the APs with DHCP.

We have a 5520 WLC with 3702i and 3802i APs. When we change ip helpers to the new DHCP server, will the APs find their way to the new server immediately? When their lease expires? Or will we need to power cycle them?

[balaji.bandi]

exiting client will stay with OLD one, new one go to new DHCP Server. when they lease expires they get new IP address from new DHCP Server.