Fortinet FortiGate FortiGate-5000 Backplane Communications Manual page 16

HA configurations
16
Unlike hardware configurations involving two FortiSwitch modules per chassis,
when installing only one FortiSwitch module per chassis, the slot position of the
FortiSwitch module becomes an important consideration. Single FortiSwitch-5003
modules should usually be installed in slot 2 for FortiGate-5001SX and
FortiGate-5001FA2 clusters, but slot 1 for FortiGate-5005FA2 clusters. For details
on the effects of slot positioning of a single FortiSwitch module in HA
configurations, see "Slot position and HA heartbeat interface precedence" on
page 20
.
Note: Using a single FortiSwitch-5003 module for HA heartbeat communication introduces
a single point of failure. If this FortiSwitch-5003 module fails or is removed, HA heartbeat
communication will be interrupted. For enhanced reliability, you can add a second
FortiSwitch-5003 module. You can also improve reliability by connecting and configuring
one or more other heartbeat interfaces.
Figure 6: HA cluster with one available base backplane heartbeat interface (through
FortiSwitch-5003 module in slot 2)
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To configure your HA cluster to use the base backplane interface connected
through a single FortiSwitch, the base backplane interface must be enabled as a
heartbeat interface and:
• if priorities are not equal, have the highest priority of all heartbeat interfaces
FortiGate-5000 Series Version 3.0 MR5 Backplane Communications Guide
FortiGate-5140 base backplane communication
base backplane channel 2
5140SAP
SERIAL 1 SERIAL 2 ALARM
5140
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MANAGEMENT
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