When a forwarding class is redirected to a ingress or egress port queue group queue, the packets sent to the queue are statistically tracked by a set of counters associated with the queue group queue and not with any of the counters associated with the SAP.
This means that it is not possible to perform accounting within a queue group based on the source SAPs feeding packets to the queue. The statistics associated with the SAP do not reflect packets redirected to a port queue group queue.
The set of statistics per queue are eligible for collection in a similar manner as SAP queues. The collect-stats command enables or disables statistics collection into a billing file based on the accounting policy applied to the queue group.