Link flap is a condition where a communications link alternates between ''up'' and ''down'' states. Link flap can be caused by
end station
In networking jargon, a computer, phone, or internet of things device connected to a computer network is sometimes referred to as an end system or end station, because it sits at the edge of the network. The end user directly interacts with an ...
reboots, power-saving features, incorrect duplex configuration or marginal connections and
signal integrity issues on the link.
References
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Computer networking