March 31, 20206 yr I change the SFP+ that resolve X520 link flap issue, the problem one also same brand Unicaca, just different model.
January 28, 20224 yr Just adding my own experiences, sry for the necro, maybe useful for someone else... port flapping With the same X520-DA2 combined with mikrotik S+AO00005 cable to a Mikrotik CRS305-1G-4S+IN used as a switch Jan 28 21:54:04 Storage kernel: bond0: link status definitely down for interface eth0, disabling it Jan 28 21:54:53 Storage kernel: ixgbe 0000:65:00.0 eth0: NIC Link is Up 10 Gbps, Flow Control: RX/TX Jan 28 21:54:53 Storage kernel: bond0: link status definitely up for interface eth0, 10000 Mbps full duplex Jan 28 21:54:55 Storage kernel: ixgbe 0000:65:00.0 eth0: NIC Link is Down Jan 28 21:54:55 Storage kernel: bond0: link status definitely down for interface eth0, disabling it Port flapping occured in one of the ports, the other I think just didn't log it, as it sure wasn't working, and while the switch showed link, unraid reported it as down. fw version: # ethtool -i eth0 driver: ixgbe version: 5.3.6 firmware-version: 0x80000231 expansion-rom-version: bus-info: 0000:65:00.0 supports-statistics: yes supports-test: yes supports-eeprom-access: yes supports-register-dump: yes supports-priv-flags: yes Exhibited the same problem in another PC, (old Z79 based) but not in a third (Z99). The unRaid one is a X299 based newer machine. Very weird compatibility issue.
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