Change IP after ISE CoA

I have heard of this issue before, but am not quite sure how to stop it...
Client connects to switch, switch contacts ISE on the backend. Client gets IP address on VLAN 30 in the meantime. ISE determines client belongs in VLAN 60 and performs CoA. Switch changes VLAN, but client still has an IP address in VLAN 30.
Anyone have a good way to stop this? The only thing I've heard is to put a pre-auth ACL on the port denying DHCP. But I am having issues even getting that to work.
Thanks.

This would actually fit my ultimate intended model, where an auth failure authorizes the client on the Guest VLAN. Is the critical auth VLAN able to be used in closed mode?
Response: Yes, you can. I was really talking about the usage of the following commands:
authentication event server dead action reinitialize vlan fail_safe_vlan
authentication even server dead action authorize vlan fail_safe_vlan
Those commands are very useful when you need to protect yourself against ISE/Radius outage. However, when you ave a pre-auth ACL and the Radius server is down, there is nothing (no Radius server) left to push a dACL and replace the pre-auth ACL. Thus, even though endpoints are allowed on the critical VLAN, the pre-auth ACL is still there, thus preventing clients from gaining access to the network. With the Cat3850 you can have a critical ACL. With the 3750s running IP Services you can configure an EEM script that can remove the ACL in the event of an ISE outage
Leaving them all on the same with with SGTs isn't really an option here. The reason why is that many of these machines are machines that do not get updated regularly, so they are vulnerable. We have them in a VRF. Therefore, they need to be in a different VLAN.
Response: SGT can actually provide layer 2 segmentation too :) SGT/SGA is really the future of TrustSec
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