Link flap is a condition where a communications link alternates between up and down states.[1] Link flap can be caused by end station reboots, power-saving features, incorrect duplex configuration or marginal connections and signal integrity issues on the link.[2]


  1. ^ "What is the Link-flap error in Cisco Switches?". Retrieved 2012-12-02.
  2. ^ "How to Troubleshoot I/O Port Flapping". Retrieved 2012-12-02.