This read-write object specifies the disposition applied to Unidirectional Link Detection (UDLD) protocol frames on this port's CPD profile, identified by MAC address 01:00:0C:CC:CC:CC and Ethertype 0x111. An administrator sets this to determine whether UDLD frames, used to detect one-way fiber or cable faults, are peered with locally, dropped, or tunneled through the port. For example, setting this disposition to peer on an inter-switch uplink port lets the device participate in UDLD to detect a mis-wired unidirectional link before it causes a bridging loop.