code: def dscp_marking_and_throttling(self, qos_policy):
          
          self._interface.data.update(qos_limit=-1,
              qos_mode='dscp',
              qos_policy_ref=qos_policy.href)
docs: Enable DSCP marking and throttling on the interface. This requires that
          you provide a QoS policy to which identifies DSCP tags and how to prioritize
          that traffic.
          
          :param QoSPolicy qos_policy: the qos policy to apply to the interface