Chapter 9 High Availability for FortiOS 5.0 : HA and failover protection : Synchronizing kernel routing tables : Controlling how the FGCP synchronizes kernel routing table updates
  
Controlling how the FGCP synchronizes kernel routing table updates
You can use the following commands to control some of the timing settings that the FGCP uses when synchronizing kernel routing table updates from the primary unit to subordinate units and maintaining routes on the primary unit after a failover.
config system ha
set route-hold <hold_integer>
set route-ttl <ttl_integer>
set route-wait <wait_integer>
end