Why one of the slave interface Link is flapping continuosly in bonding ?

Solution Unverified - Updated -

Environment

  • Red Hat Enterprise Linux 6.4
  • bonding configured

Issue

  • Link Failure Count is too high.
  • Link down messages like below are seen in logs.
Jul 24 09:24:41 HOSTNAME kernel: bonding: bond0: link status definitely down for interface eth1, disabling it
Jul 24 09:24:41 HOSTNAME kernel: bnx2x 0000:04:00.1: eth1: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit
Jul 24 09:24:41 HOSTNAME kernel: bond0: link status definitely up for interface eth1, 10000 Mbps full duplex.
Jul 24 09:28:05 HOSTNAME kernel: bnx2x 0000:04:00.1: eth1: NIC Link is Down
Jul 24 09:28:06 HOSTNAME kernel: bonding: bond0: link status definitely down for interface eth1, disabling it
Jul 24 09:28:06 HOSTNAME kernel: bnx2x 0000:04:00.1: eth1: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit
Jul 24 09:28:06 HOSTNAME kernel: bond0: link status definitely up for interface eth1, 10000 Mbps full duplex.
Jul 24 09:39:57 HOSTNAME screxd: INFO: COMMAND=grep -i definit /var/log/messages| grep Jul | grep 24
Jul 24 09:41:31 HOSTNAME kernel: bnx2x 0000:04:00.1: eth1: NIC Link is Down
Jul 24 09:41:31 HOSTNAME kernel: bonding: bond0: link status definitely down for interface eth1, disabling it
Jul 24 09:41:32 HOSTNAME kernel: bnx2x 0000:04:00.1: eth1: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit
Jul 24 09:41:32 HOSTNAME kernel: bond0: link status definitely up for interface eth1, 10000 Mbps full duplex.
Jul 24 09:43:17 HOSTNAME OpenSM[8302]: /tmp/ibdiagnet_ibis.log log file opened
Jul 24 09:48:35 HOSTNAME kernel: bnx2x 0000:04:00.1: eth1: NIC Link is Down
Jul 24 09:48:35 HOSTNAME kernel: bonding: bond0: link status definitely down for interface eth1, disabling it
Jul 24 09:48:36 HOSTNAME kernel: bnx2x 0000:04:00.1: eth1: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit

Resolution

  • Updated the firmware of the server which resolved the link flapping issue.
  • Faulty NIC/cable can also cause such flapping issue.

Root Cause

  • Issue with NIC firmware.

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