This read-write EthernetPortTrafficModel selects the traffic management connection model of the Ethernet Access Port, either accessFlow for NID traffic connections or flowpoint for multipoint and aggregation connections. This is a fundamental architecture choice that determines how flows and QoS are structured on the port. For example, an administrator switches a port's traffic model to flowpoint to support a multipoint aggregation service instead of simple point-to-point NID connections.