With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cbQosCMNoBufDropPkt
Cisco Class Based Qos ClassMap No Buffer Dropped Packet
1.3.6.1.4.1.9.9.166.1.15.1.1.20
The lower 32 bits drop packet count which occured due to a lack of SRAM buffers during output processing on an interface.
Back to CISCO-CLASS-BASED-QOS-MIB MIB page.
IPHost Network monitor allows you to monitor cbQosCMNoBufDropPkt 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.