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Duplicate MAC addresses detected on NetApp E Series iSCSI Ports

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Applies to

  • NetApp E-Series EF300
  • 10/25GbE iSCSI host interface cards (HIC)
    • Part Number: 110-00611
    • Replacement Part numbers X-56040-00 and SP-56040-00

Issue

  • E-Series controllers using the 10/25GbE iSCSI host interface cards may report the same MAC addresses on different iSCSI HIC ports.
  • The label on the HIC shows the correct starting MAC address. That address is the first of 16 sequential addresses. But, the ports may instead show a duplicate factory default address.
  • When two affected HICs are connected to the same network, the duplicate addresses can cause:
    • Network connectivity problems
    • Incorrect traffic routing
    • Packet loss
    • MAC-address conflicts
    • Intermittent iSCSI connectivity or iSCSI login failures
    • Unstable host paths or multipath errors
    • The network blocking or suppressing one of the devices
  • Check the MAC addresses on the iSCSI ports in SANtricity or in the storage array profile. Compare them with the address printed on the HIC label.

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