With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgrtDestCongestionDrops
Cisco IP Transfer Point GRT Dest Congestion Drops
1.3.6.1.4.1.9.9.334.1.2.2.1.12
The number of MSUs dropped for this destination due to local and remote congestion.
Back to CISCO-ITP-GRT-MIB MIB page.
IPHost Network monitor allows you to monitor cgrtDestCongestionDrops 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.