This read-only counter tracks how many egress cells the port transmitted with the Explicit Forward Congestion Indication bit set, signalling downstream congestion to the receiving end system. An administrator watches this counter to see how often the card is actively notifying ABR-capable equipment of congestion via EFCI marking, which ties back to the egrQEfciThresh setting on the relevant queue. A steadily increasing count suggests the egress queue is regularly crossing its EFCI threshold and the network is experiencing sustained congestion.