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CONTAP-560034: Intel XL710 NIC connected to Cisco N5K switches will fail after upgrade to ONTAP 9.18.1 and later

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Issue

  • Intel XL710 NIC (network interface card) - X1440A, X91440A, X1147A
  • Cisco switch N5K series like Nexus 5596 running any NX-OS as data switch

  • Cisco switch N7K series like Nexus 7018 running any NX-OS as data switch

  • NIC ports fails to communicate via the switch as single port or IFGRP.
  • The following shows that there are enqueues with no dequeues:
    ::> systemshell -node <node name> -command sysctl dev.ixl | grep txq_ | grep queued | grep txq00
    i.e.
    dev.ixl.1b.iflib.txq00.txq_enqueued: 1920
    dev.ixl.1b.iflib.txq00.txq_dequeued: 0
    dev.ixl.1a.iflib.txq00.txq_enqueued: 1920
    dev.ixl.1a.iflib.txq00.txq_dequeued: 0

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