Fortinet FortiGate FortiGate-400A Administration Manual page 94

HA
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2 Power on all the FortiGate units in the cluster.
As the units start, they negotiate to choose the primary cluster unit and the
subordinate units. This negotiation occurs with no user intervention and normally just
takes a few seconds.
You can now configure the cluster as if it is a single FortiGate unit.
To add a new unit to a functioning cluster
1 Configure the new FortiGate unit for HA operation with the same HA configuration as
the other units in the cluster.
2 If the cluster is running in Transparent mode, change the operating mode of the new
FortiGate unit to Transparent mode.
3 Connect the new FortiGate unit to the cluster.
4 Power on the new FortiGate unit.
When the unit starts it negotiates to join the cluster. After it joins the cluster, the cluster
synchronizes the new unit configuration with the configuration of the primary unit.
To configure weighted-round-robin weights
By default, in active-active HA mode the weighted round-robin schedule assigns the
same weight to each FortiGate unit in the cluster. If you configure a cluster to use the
weighted round-robin schedule, from the CLI you can use config system ha
weight to configure a weight value for each cluster unit. The weight value sets the
maximum number of connections that are sent to a cluster unit before a connection
can be sent to the next cluster unit. You can set weight values to control the number of
connections processed by each cluster unit. For example, you might want to reduce
the number of connections processed by the primary cluster unit by increasing the
weight assigned to the subordinate cluster units.
Weight values are entered as two values; the priority order of the unit in the cluster (in
the range 0 to 31) followed by its weight (also in the range 0 to 31). For example, if you
have a cluster of three FortiGate units, you can enter the following command to
configure the weight values for each unit:
config system ha
set ha weight 0 1 1 3 2 3
end
This command has the following results:
• The first connection is processed by the primary unit (priority 0, weight 1)
• The next three connections are processed by the first subordinate unit (priority 1,
weight 3)
• The next three connections are processed by the second subordinate unit (priority
2, weight 3)
The subordinate units process more connections than the primary unit, and both
subordinate units, on average, process the same number of connections.
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System config
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