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A custom bug ID has been generated as the vendor did not provide one: b241f7110572
When two NICs that use the ntg3 driver of versions 4.1.3 and later are connected directly, not to a physical switch port, link flapping might occur. The issue does not occur on ntg3 drivers of versions earlier than 4.1.3 or the tg3 driver. This issue is not related to the occasional Energy Efficient Ethernet (EEE) link flapping on such NICs. The fix for the EEE issue is to use a ntg3 driver of version 4.1.7 or later, or disable EEE on physical switch ports. The noPhyStateSet parameter defaults to 0 and is not required in most environments, except they face the issue.
Upgrade the ntg3 driver to version 4.1.8 and set the new module parameter noPhyStateSet to 1
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