With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cdsTotalDroppedPkts
CISCO DHCP SNOOPING Total Dropped Packets
1.3.6.1.4.1.9.9.380.1.5.2
Indicates the total number of packets subjected to DHCP Snooping is dropped.
Back to CISCO-DHCP-SNOOPING-MIB MIB page.
IPHost Network monitor allows you to monitor cdsTotalDroppedPkts on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.