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Links flap and switch logs "local fault" even though optic levels are in normal ranges.

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TitleLinks flap and switch logs "local fault" even though optic levels are in normal ranges.
Symptoms
Server is connected to switch with several ports grouped in link aggregation group. If switch reboots ports would flap and switch would log "local fault" errors:
10/31/2019 10:51:11.72 <Info:vlan.msgs.portLinkStateDown> Port 15 link down - Local fault
10/31/2019 10:51:11.72 <Info:vlan.msgs.portLinkStateDown> Port 14 link down - Local fault
10/31/2019 10:51:11.41 <Info:vlan.msgs.portLinkStateUp> Port 15 link UP at speed 10 Gbps and full-duplex
10/31/2019 10:51:11.41 <Info:vlan.msgs.portLinkStateUp> Port 14 link UP at speed 10 Gbps and full-duplex
Optic levels are in normal range:
X670.1 # sh port 14-15 transceiver information

Port Temp TxPower RxPower TxBiasCurrent Voltage-Aux1/ Voltage-Aux2
(Celsius) (dBm) (dBm) (mA) Vcc (Volts) (Volts)
================================================================================
14 59.21 -2.82 -2.87 6.71 3.28 N/A
15 57.43 -2.64 -2.49 6.71 3.27 N/A
================================================================================
N/A - parameter not applicable to transceiver connected to the port
* - value is out of normal range
Environment
  • Windows Server 2016
  • Intel(R) Ethernet 10G 4P x710/I350 rNDC
  • NIC driver version 1.8.104.5
  • Summit x670-G2
  • Port link aggregation
Cause
Issue with PHY layer on server NIC.
Resolution
Upgrade NIC driver to the latest version on the server side. If it doesn't help please make sure that switch is running latest recommended software version and log a case with GTAC.
Additional notes

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