FTD 4115 HA FO Link Flapping w/ Fault F0276

[a12288]

Good day.

I have a pair of FTD 4115 HA somehow the HA FO link (e1/3) started to flapping w/ fault F0276 every few seconds (verified via API call and PING). Currently the HA is broken and primary unit is showing being disabled. This is a new deployment and running 7.0.1, anyone has any lead on this? The last resort is to replace the optics and optical fiber in our data center but I am not convinced that is the root case. Thanks.

"code": "F0276", "descr": "ether port 1/3 on fabric interconnect A oper state: link-down, reason: Link failure or not-connected", "dn": "sys/switch/ports/Ethernet1_API_SLASH_3/fault/F0276", "id": "140961",

Leo

[balaji.bandi]

look at the logs :

https://www.cisco.com/c/en/us/td/docs/security/firepower/fxos/fxos261/faults/FXOSFaultsErrorsRef/FaultsTransient.html

or check may be bug :

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvz05767

[MHM Cisco World]

so you FO link is not direct connect ? it connect via SW?
if yes then go to SW and see MAC address for both active and standby it think this mac is same.

[a12288]

The L1 connection of this HA link is fine and we followed Cisco recommendation to have it back-to-back directly connected, no any L2 device along the path.

I manually rebooted the FTD and everything back to normal, somehow reboot the firepower chassis did not help. Can anyone shed some lights or any explanation here?

Leo

[MHM Cisco World]

check this i think this is issue here 

https://www.globalknowledge.com/us-en/resources/resource-library/articles/benefit-from-using-failover-mac-address/#gref