I've been testing a few configuration tweaks in order to reduce my OSPF routing convergence to the bone, a sub second fail-over.
Here are the optimal FortiGate Cluster Protocol settings I've found out:
config system ha ... set route-ttl 60 set route-wait 60 set route-hold 60 set hb-interval 1 set hb-lost-threshold 3 set hello-holddown 5 set arps 50 set arps-interval 1 set session-pickup enable set session-pickup-connectionless enable set session-pickup-delay enable set link-failed-signal enable ...
You will find all the needed information of each parameters here:
Graceful restart has to be setup at your dynamic routing protocol, on this lab, OSPF over IPsec is used.
config router ospf set router-id 18.104.22.168 set restart-mode graceful-restart config area edit 0.0.0.0 next ...
Below is a view behind a Spoke FortiGate reaching the FGCP OSPF router through an IPsec tunnel. The FGCP is conducting a failover due to port10 being brought down on the Master node.