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Article By default, the time between HA heartbeat packets is 200 milliseconds.
In FortiOS, it is possible to change this time using the following CLI command:
# config system ha set hb-interval <interval_integer>
*The default <interval_integer> is 2. The heartbeat interval range is 1 to 20 (100*ms).
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A heartbeat interval of 2 means the time between heartbeat packets is 200 ms. Changing the heartbeat interval to 5 changes the time between heartbeat packets to 500 ms.
HA heartbeat packets consume more bandwidth if the heartbeat interval is short. But if the heartbeat interval is very long, the cluster is not as sensitive to topology and other network changes.
