Fortinet 5003 - Manual (Page 83)

FortiGate-5020 base backplane communication HA configurations
FortiSwitch-5003A and 5003 Fabric and Base Backplane Communications Guide
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Figure 34: FortiGate-5005FA2 heartbeat failover between base backplane channels
Figure 35: FortiGate-5001SX/FortiGate-5001FA2 heartbeat failover between base
backplane channels
To configure heartbeat interface failover between two base backplane
channels
1 Insert FortiGate modules into the chassis slots.
For details on hardware installation and related warnings and cautions, see the
FortiGate-5000 Series Introduction .
2 Power on each chassis.