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48 01-28008-0018-20050128 Fortinet Inc.
Configuring FortiGate units for HA operation High availability installation
Table 10: High availability settings
Mode
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.
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.
Group ID
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
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.
Unit priority
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.
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
Master
You can configure a FortiGate unit to always become the primary unit in the
cluster by giving it a high priority and by selecting Override master.