Tien,
You can setup HA with the controllers running with either 1 NIC or 3 NIC but both the controller should have the same NIC configuration.
Choosing 1 NIC or 3 NIC depends on your requirements. If you want to separate the control, cluster, and management traffic, you can set up the controllers with 3 NIC otherwise go with 1 NIC which allows all the traffic.
Note: If you select 3 NICs, you must configure each of the three interfaces to be on
three different subnets
- Anusha