Ethtool reports NIC speed as “unknown” on systems with Intel I354 NICs

Updated -

Issue

When running the ethtool command to view information about Intel I354 network devices, the network connection speed may be returned as "unknown."

Environment

Intel® I354 Ethernet devices
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7

Diagnostic

When running the 'ethtool -i' command against such devices, the following output may...

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