Hi Michael Haring,
It doesn't matter whether a controller is a master or a local, Centralised Licensing is independent of this setup.
1. You have to Enable the centralised Licensing on both the controllers and specify the licensing server IP (Ex Master1) on the other controller (Ex: Master 2).
2. Configure VRRP if you want to enable Backup license server.
2. Ensure there is IP reachable between those two Controllers.
3. Allow the following ports in the Firewall if any.
- 1. UDP Source port = 8211
- 2. UDP destination port = 8211
- 3. Keepalives timer = Sent every 30 seconds
- 4. Keepalives direction = Sent in both directions: Server==>client, client==>server
Please feel free for any further help on this.