This read-create object specifies how the switch maps the ATM Congestion Loss Priority bit back onto the frame-relay Discard-Eligible bit as traffic crosses from ATM to frame relay, per FRF.5 and FRF.8, with different valid values for network interworking versus service interworking. Because the valid choices differ by interworking type, setting a service-interworking-only value such as deIsZero on a network-interworking connection would be inconsistent with FRF.5. deIfClp makes the DE bit on the frame-relay side directly mirror whatever CLP value arrived on the ATM side, rather than always forcing it to a fixed zero or one.