With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cbQosCMDropByte
Cisco Class Based Qos ClassMap Dropped Byte
1.3.6.1.4.1.9.9.166.1.15.1.1.16
The lower 32 bits counter of dropped bytes per class as the result of all features that can produce drops (e.g., police, random detect, etc.).
Back to CISCO-CLASS-BASED-QOS-MIB MIB page.
IPHost Network monitor allows you to monitor cbQosCMDropByte on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.
