Ingress SAP classification and marking is supported for the 7450 ESS and 7750 SR only. DE=0 frames are subject to the CIR marking algorithm in the queue. Drop preference for these packets follows the state of the CIR bucket associated with the ingress queue. The value is marked in the drop preference bit of the internal header and in the DE bit in the Q.922 frame header. DE=1 frames are classified in "out-of-profile" state and are not overwritten by the CIR marking in the ingress queue. The drop preference is set to high.