You can configure up to four FortiManager units as backup (also called secondary or peer) units in an HA cluster. You must know the IP address and serial number of the primary FortiManager unit in the HA cluster to complete this procedure.
To configure the backup FortiManager unit:
- Go to System Settings > HA.
- Beside Operation Mode, select Secondary.
- In the Peer IP box, enter the IP address of the primary FortiManager unit.
- In the Peer SN box, enter the serial number of the primary FortiManager unit.
- Click Apply.