How to debug fortigate OSPF

you may debbug your ospf configuration with the following commands

FortiOS 4.0

Forti# diagnose ip router ospf all enable
Forti# diagnose ip router ospf level info

other options are below
critical critical level
error error level
info information level
none none level
warn warning level

Forti# diagnose debug enable

to cancel the output just run “diagnose debug disable” while output flows on your screen.