Priority And Primary Chassis Selection - Fortinet FortiGate-7060E Handbook

Priority and primary chassis selection

A tolerance of 0 means that if a single module fails in the primary chassis a failover occurs and the chassis with
the fewest failed modules becomes the new primary chassis. A higher failover tolerance means that more
modules can fail before a failover occurs. For example, if the tolerance is set to 1, at least two modules in the
primary chassis will have to fail before a failover occurs.
Priority and primary chassis selection
You can select a chassis to become the primary chassis by setting the HA priority of one of one or more of its FIM
modules (for example, the FIM module in slot 1) higher than the priority of the other FIM modules. Enter the
following command to set the HA priority:
config system ha
set priority <number>
end
The default priority is 128.
The chassis with the highest total FIM module HA priority becomes the primary chassis.
Override and primary chassis selection
Enabling override changes the order of primary chassis selection. If override is enabled, primary chassis
selection considers priority before chassis up tme and serial number. This means that if you set the device priority
higher for one chassis, with override enabled this chassi becomes the primary chassis even if its uptime and
serial number are lower than the other chassis.
Enter the following command to enable override.
config system ha
set override enable
end
When override is enabled primary unit selection checks the traffic bandwidth score, aggregate interface state,
management interface links and FPM module failures first. So any of these factors affect primary chassis
selection, even if override is enabled.
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