With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGtpUnexpectedMsgs
Cisco GPRS Tunneling Protocol Unexpected Messages
1.3.6.1.4.1.9.9.188.1.3.4.1.1
This object represents the number of unexpected PDUs received. Trigger Condition: The counter is incremented when GGSN receives a GTP PDU for nonexistent PDP context.
Back to CISCO-GTP-MIB MIB page.
IPHost Network monitor allows you to monitor cGtpUnexpectedMsgs 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.