This boolean, when set, bypasses an H_Port so the attached device is prevented from communicating with the switch or any other device on the loop; the incoming signal from that device is not placed on the Loop at all. An admin sets this to remove a misbehaving or disruptive device from the arbitrated loop without physically unplugging it, protecting the rest of the loop's traffic. Setting it back to false re-inserts the device onto the loop.