Queue is full

When a queue is full, you need to increment discards in the respective queue on the ingress interface.

Example:

 switch# show queuing interface ethernet 1/1
 Ethernet1/1 queuing information:
    TX Queuing
      qos-group  sched-type  oper-bandwidth
          0       WRR             50
          1       WRR             50
    RX Queuing
      qos-group 0
      q-size: 243200, HW MTU: 1600 (1500 configured)
      drop-type: drop, xon: 0, xoff: 1520
      Statistics:
          Pkts received over the port             : 0
          Ucast pkts sent to the cross-bar        : 0
          Mcast pkts sent to the cross-bar        : 0
          Ucast pkts received from the cross-bar  : 0
          Pkts sent to the port                   : 0
      <b>    Pkts discarded on ingress               : 0 </b>
          Per-priority-pause status               : Rx (Inactive), Tx
 (Inactive)
      qos-group 1
      q-size: 76800, HW MTU: 2240 (2158 configured)
      drop-type: no-drop, xon: 128, xoff: 240
      Statistics:
          Pkts received over the port             : 0
          Ucast pkts sent to the cross-bar        : 0
          Mcast pkts sent to the cross-bar        : 0
          Ucast pkts received from the cross-bar  : 0
          Pkts sent to the port                   : 0
      <b>   Pkts discarded on ingress               : 0 </b>
          Per-priority-pause status               : Rx (Inactive), Tx
 (Inactive)
    Total Multicast crossbar statistics:
      Mcast pkts received from the cross-bar      : 0