Hi,
I did a quick research on the OSPF implementation on the XG series and did not find any clues on how to activate or rather configure "graceful restart" or NSF, as stated in RFC 3623.
I have two XG430s in an active-passive configuration connected to a FortiGate cluster. Both clusters exchanges their local connected routes and OSPF works flawlessly. That is, until I restart the primary firewall of one of the two clusters for firmware updates or other reasons.
The FortiGate cluster has graceful restart enabled and HA route wait timings etc. configured so the cluster sends out the appropriate grace-LSAs when doing restart of the master or failure of it.
The XG cluster on the other hand, does not seem to advertise those grace-LSAs, as it seems to directly flush its LSAs, which causes to the FortiGate cluster to drop its learned routes from the XGs as it seems to go through normal OSPF shutdown.
Ultimately, this causes a brief routing outage between the to clusters and causes some prolonged networks interruptions, which could be avoidable if all adjacent routers had OSPF graceful restart enabled.
So my question is, is there a way to enable graceful restart or NSF on the XG side? Or is it enabled by default I am missing something else entirely?
Thanks for your time and your help!
With best regards,
Florian
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