The answer to your last question is "Yes".
To configure master redundancy:
- Configure a vrrp between two controllers on their management vlan.
- First Make sure that the controller with the configuration that you desire has the higher priority and is the "master" of the vrrp (show vrrp). This is important, because whoever has control of the VRRP when you configure master redundancy propagates his configuration to the opposite controller. If you configure the VRRP wrong, a controller with very little configuration who has control of the VRRP when you configure master redundancy will overwrite the other controller's configuration.
- When you are sure the controller with the desired config is the master of the VRRP, first configure master redundancy on that side. Master redundancy will ask you what VRRP do you want to tie the master redundancy to. This is important because the status of that VRRP decides what configuration will be used between both controllers.
- Configure master redundancy on the other side. That side should have the role of "backup" on the VRRP
- When you have both sides configured, when you type "show switches" from the "Master" side, it should show the other side as standby, and that is how you know you are successful...
Gotchas:
- You cannot terminate any access points on the backup master. You would point the LMS-IP of the ap group at the VRRP address and whoever has control of the VRRP (the master) would terminate and service the access points.
- If any access points point to the backup master, no traffic will be passed
- If the backup master is running a DHCP server, it will still give out ip addresses.