This read-write object sets the Control Protocol Disposition for GARP Multicast Registration Protocol (GMRP) frames, identified by MAC address 01:80:C2:00:00:20, on this Ethernet traffic port. An administrator configures this to control whether multicast group registration signaling from an attached device is processed by this device or passed through unaffected. For example, setting this disposition to discard on a strict access port prevents a customer device from registering multicast groups via GMRP through the demarcation.