With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cbQosC3plAccountDropPkt
Cisco Class Based Qos C3pl Account Dropped Packet
1.3.6.1.4.1.9.9.166.1.34.1.1.2
The lower 32 bits count of packets dropped when the number of packets in the associated queue was greater than the minimum threshold and less than the maximum threshold.
Back to CISCO-CLASS-BASED-QOS-MIB MIB page.
IPHost Network monitor allows you to monitor cbQosC3plAccountDropPkt on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.
