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CONTAP-512746: PFC disabled on CX6 non-shared cluster ports after ONTAP upgrade to 9.16.1+

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ontap-9
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Issue

After an upgrade to 9.16.1+, priority flow control can be unintentionally disabled on cluster ports using CX6 cards that are not shared cluster/HA ports.
This can cause discards, unsupported ops and cluster network latency

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