Why the network interface is flapping even if the cable is not connected?

Solution Verified - Updated -

Issue

  • Network interface is flapping even if the cable is not connected.
  • ixgbe driver logs bogus messages for link Up/Down even though the cable is not connected to the NIC port.
kernel: ixgbe 0000:0b:00.1 ens2f1: NIC Link is Up 10 Gbps, Flow Control: RX/TX
kernel: ixgbe 0000:0b:00.1 ens2f1: NIC Link is Down
NetworkManager[3407]: <info>  [1572107185.6803] device (ens2f1): carrier: link connected
kernel: ixgbe 0000:0b:00.1 ens2f1: NIC Link is Up 10 Gbps, Flow Control: RX/TX
kernel: ixgbe 0000:0b:00.1 ens2f1: NIC Link is Down
NetworkManager[3407]: <info>  [1572194396.2855] device (ens2f1): carrier: link connected
kernel: ixgbe 0000:0b:00.1 ens2f1: NIC Link is Up 10 Gbps, Flow Control: RX/TX
kernel: ixgbe 0000:0b:00.1 ens2f1: NIC Link is Down

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • ixgbe driver

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