This read-write object specifies the disposition applied to Dynamic Trunking Protocol (DTP) frames on this port's CPD profile, identified by MAC address 01:00:0C:CC:CC:CC and Ethertype 0x2004. An administrator sets this to control whether DTP negotiation frames, which Cisco switches use to auto-negotiate trunk links, are handled locally, dropped, or passed through the port. For example, setting this disposition to drop on a demarcation port prevents a customer's switch from inadvertently negotiating an unwanted trunk link with the carrier's equipment via DTP.