FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
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Article Id 194942
Description This article describes how to use FortiOS CLI commands to control the number of ARP packets sent and their interval by the primary unit after a failover.
Scope All FortiGate models.
Solution

It is possible to use the following command to set the number of gratuitous ARP packets that are sent after a failover.

 

Command syntax.

 

config system ha

set arps <1 to 60; default 5>

set arps-interval <1 to 20; default 8>

end

 

arps -> Set the number of gratuitous ARP packets sent by the new primary unit after HA failover. 

 

Gratuitous ARP (GARP) packets are sent when a cluster unit becomes a primary unit.

The gratuitous ARP packets configure connected networks to associate the cluster virtual MAC address with the cluster IP address.

 

Lower it to reduce traffic. Keep it higher to reduce failover time.

 

arps-interval -> Time between gratuitous ARPs. Lower the interval to reduce failover time. Keep it higher to reduce traffic.