Fortinet FortiGate FortiGate-100A, Administration Manual

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HA configuration System config
For most FortiGate models if you do not change the heartbeat device configuration,
you would isolate the HA interfaces of all of the cluster units by connecting them all to
the same switch. If the cluster consists of two FortiGate units you can connect the
heartbeat device interfaces directly using a crossover cable.
HA heartbeat and data traffic are supported on the same FortiGate interface. In
NAT/Route mode, if you decide to use the heartbeat device interfaces for processing
network traffic or for a management connection, you can assign the interface any IP
address. This IP address does not affect the heartbeat traffic. In Transparent mode,
you can connect the interface to your network.
Monitor priorities
Monitor priorities and link failover is not supported for the internal interface.
Enable or disable monitoring a FortiGate interface to verify that the interface is
functioning properly and connected to its network. If a monitored interface fails or is
disconnected from its network the interface leaves the cluster. The cluster reroutes
the traffic being processed by that interface to the same interface of another cluster
unit in the cluster that still has a connection to the network. This other cluster unit
becomes the new primary cluster unit.
If you can re-establish traffic flow through the interface (for example, if you re-connect
a disconnected network cable) the interface rejoins the cluster. If Override Master is
enabled for this FortiGate unit (see
“Override Master” on page 87 ), this FortiGate unit
becomes the primary unit in the cluster again.
Increase the priority of interfaces connected to higher priority networks or networks
with more traffic. The monitor priority range is 0 to 512.
If a high priority interface on the primary cluster unit fails, one of the other units in the
cluster becomes the new primary unit to provide better service to the high priority
network.
If a low priority interface fails on one cluster unit and a high priority interface fails on
another cluster unit, a unit in the cluster with a working connection to the high priority
interface would, if it becomes necessary to negotiate a new primary unit, be selected
instead of a unit with a working connection to the low priority interface.
• Configuring an HA cluster
• Managing an HA cluster
Note: Only monitor interfaces that are connected to networks.
Note: You can monitor physical interfaces, but not VLAN subinterfaces.