Fortinet MR8 manual Group ID MAC Address

Configuring FortiGate units for HA operation			High availability installation
	Table 10: High availability settings
		Active-Active	Load balancing and failover HA. Each FortiGate unit in the
			HA cluster actively processes connections and monitors the
			status of the other FortiGate units in the cluster. The
			primary FortiGate unit in the cluster controls load balancing.
	Mode
		Active-Passive	Failover HA. The primary FortiGate unit in the cluster
			processes all connections. All other FortiGate units in the
			cluster are passively monitor the cluster status and remain
			synchronized with the primary FortiGate unit.
		All members of	the HA cluster must be set to the same HA mode.
		The group ID range is from 0 to 63. All members of the HA cluster must have
		the same group ID.
		When the FortiGate units in the cluster are switched to HA mode, all of the
		interfaces of all of the units in the cluster get the same virtual MAC address.
		This virtual MAC address is set according to the group ID.
		Group ID	MAC Address
		0	00-09-0f-06-ff-00
	Group ID	1	00-09-0f-06-ff-01
		2	00-09-0f-06-ff-02
		3	00-09-0f-06-ff-03
		…
		63	00-09-0f-06-ff-3f
		If you have more	than one HA cluster on the same network, each cluster
		should have a different group ID. If two clusters on the same network have
		same group ID, the duplicate MAC addresses cause addressing conflicts on
		the network.
		The unit with the highest priority becomes the primary unit in the cluster. The
		unit priority range is 0 to 255. The default unit priority is 128.
	Unit priority	Set the unit priority to a higher value if you want the FortiGate unit to be the
		primary cluster unit. Set the unit priority to a lower value if you want the
		FortiGate unit to be a subordinate unit in the cluster. If all units have the
		same priority, the FortiGate unit with the highest serial number becomes the
		primary cluster unit.
	Override	You can configure a FortiGate unit to always become the primary unit in the
	Master	cluster by giving it a high priority and by selecting Override master.

48 01-28008-0018-20050128 Fortinet Inc.