Fortinet FortiGate FortiGate-500 Administration Manual page 87

System config
FortiGate-500 Administration Guide
Mode
All members of the HA cluster must be set to the same HA mode.
Active-Active Load balancing and failover HA. Each cluster unit 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 among all of
the cluster units.
Active-Passive Failover HA. The primary FortiGate unit in the cluster processes all
connections. All other FortiGate units in the cluster passively monitor the
cluster status and remain synchronized with the primary FortiGate unit.
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 acquire the same virtual MAC address. This virtual
MAC address is set according to the group ID.
set for each group ID.
Table 3: HA group ID and MAC address
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 the same group ID, the
duplicate MAC addresses cause addressing conflicts on the network.
Unit Priority
Optionally set the unit priority of the cluster unit. Each cluster unit can have a different
unit priority (the unit priority is not synchronized among cluster members). During HA
negotiation, the unit with the highest unit priority becomes the primary cluster unit. The
unit priority range is 0 to 255. The default unit priority is 128.
You can use the unit priority to control the order in which cluster units become the
primary cluster unit when a cluster unit fails. For example, if you have three
FortiGate-3600s in a cluster you can set the unit priorities as shown in
Cluster unit A will always be the primary cluster unit because it has the highest priority.
If cluster unit A fails, cluster unit B becomes the primary cluster unit because cluster
unit B has a higher unit priority than cluster unit C.
01-28006-0007-20041105
Table 3 lists the virtual MAC address
HA
Table 4.
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