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A port on a Cisco switch is repeatedly changing between up and down repeatedly. What is this called?

A Port flapping.

This is referred to as port flapping, which is also referred to as link flapping. It can be caused by a bad or nonstandard network cable, non-Energy Efficient Ethernet (EEE) devices, or non-working or syncing small form-factor pluggable (SFP) devices.

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