This read-only Counter reports the number of received packets lost on this port due to insufficient receive buffers, noted as an approximation for interfaces with multi-packet FIFO hardware. An administrator treats this port-level counter as the per-port analogue to the chassis-wide ppeTxCongests figure. For example, the admin sees sifRxQueues rising on a specific port during peak load and increases that port's sifSmlRxCnt and sifLrgRxCnt allocation in response.