It is becoming more common that the switch has port security turned on.  This means only one MAC can plug into any single port.  It is not a big deal to reset it, but for some reason I could not find a direct answer.  Here is mine;

Reset sticky bit


  • show port-security
  • sh interface status err-disabled
  • clear port-security sticky int fa 0/1
  • clear port-security sticky int Gi1/0/15




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