With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
srpErrCntCurrHostRxGiantPkts
srp Err Cnt Curr Host Rx Giant Packets
1.3.6.1.4.1.9.10.60.4.3.1.9
The counter associated with the current number of packets discarded because of being too big for the higher layer, in the current 15 minute interval.
Back to CISCO-SRP-MIB MIB page.
IPHost Network monitor allows you to monitor srpErrCntCurrHostRxGiantPkts 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.