So the scenario is like this.
Datacenter 1 - cluster 1 - APs terminated on a controller in this cluster.
Datacenter 2 - cluster 2 - APs should failover to a controller in this cluster if the controller that the APs are terminated to on cluster 1 fails.
Try this solution
Cluster 1 - This will have a MC which acts as a LMS to the APs (say 10.0.0.1 )
Cluster 2- Choose a controller which should act as a B-LMS to the AP when they fail over. (10.0.0.2)
Assuming that the datacenters have L3 connectivity, configure a vrrp instance as follows.
On Cluster 1 MC
vrrp 1
vlan <vlan used>
ip address 10.0.0.1
priority 110
preempt
authentication <choice of password>
description Preferred-Master
no shutdown
On cluster 2 Preferred MC
vrrp 1
vlan <vlan used>
ip address 10.0.0.2
priority 110
preempt
authentication <choice of password>
description Backup-Master
no shutdown
Now go to the AP system profile configured for the APs, can be viewed using the command "show ap system-profile"
open the ap system-profile using the command
ap system-profile <name of the profile used>
Configure
lms-ip <cluster 1 MC>
Bckup-lms-ip <cluster 2 MC>
Save and deploy the changes.
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