With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
atmVclStatTotalDiscards
Cisco ATM Vcl Statistics Total Discards
1.3.6.1.2.1.37.1.14.1.11.1.3
The total number of valid ATM cells discarded by the traffic policing entity. This includes cells originally received with CLP=0 and CLP=1.
Back to ATM2-MIB MIB page.
IPHost Network monitor allows you to monitor atmVclStatTotalDiscards 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.