With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGtpUnknownMsgs
Cisco GPRS Tunneling Protocol Unknown Messages
1.3.6.1.4.1.9.9.188.1.3.4.1.8
This object represents the number of unknown GTP messages received. Trigger Condition: The counter is incremented when a message using a Message Type value defining an unknown GTP signalling message is received.
Back to CISCO-GTP-MIB MIB page.
IPHost Network monitor allows you to monitor cGtpUnknownMsgs on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.