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Random OSPF Neighbor State Changes With No Link Flap Detected Between VSP and Fortigate Firewall Cluster

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Information

 
TitleRandom OSPF Neighbor State Changes With No Link Flap Detected Between VSP and Fortigate Firewall Cluster
Symptoms
  • OSPF neighbor adjacency between VSP 4850GTS and Fortigate Firewall cluster randomly drops
  • No link flap detected in VSP or Fortigate logs
  • Fortigate logs indicate receiving link state update from VSP and then appears to bounce adjacency
Screen capture of Fortigate OSPF log
  • VSP logs show going from FULL to INIT
Neighbor 240.2
CP1 [05/08/19 07:48:18.861:UTC] 0x000186c1 00000000 GlobalRouter OSPF INFO Ospf Nbr State Change: rtid:10.172.240.2, ipa:10.172.242.250 nbr-rtid:10.172.242.250 FULL->INIT Event ONE_WAY_EVENT
CP1 [05/08/19 07:48:23.723:UTC] 0x000186c1 00000000 GlobalRouter OSPF INFO Ospf Nbr State Change: rtid:10.172.240.2, ipa:10.172.242.250 nbr-rtid:10.172.242.250 LOADING->FULL Event LOADING_DONE_EVENT
CP1 [05/08/19 07:48:23.723:UTC] 0x00018709 00000000 GlobalRouter OSPF INFO Adjacency with the neighbor 10.172.242.250 has been established

Neighbor 240.3
CP1 [05/08/19 07:48:18.275:UTC] 0x000186c1 00000000 GlobalRouter OSPF INFO Ospf Nbr State Change: rtid:10.172.240.3, ipa:10.172.242.250 nbr-rtid:10.172.242.250 FULL->INIT Event ONE_WAY_EVENT
CP1 [05/08/19 07:48:22.200:UTC] 0x000186c1 00000000 GlobalRouter OSPF INFO Ospf Nbr State Change: rtid:10.172.240.3, ipa:10.172.242.250 nbr-rtid:10.172.242.250 LOADING->FULL Event LOADING_DONE_EVENT
CP1 [05/08/19 07:48:22.200:UTC] 0x00018709 00000000 GlobalRouter OSPF INFO Adjacency with the neighbor 10.172.242.250 has been established

 
Environment
  • VSP 4850GTS
  • Release 6.1.4
Cause
Issue on Fortigate firewall side
Resolution
Investigate Fortigate firewall cluster
Additional notes

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