With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGtpRoamingPDUs
Cisco GPRS Tunneling Protocol Roaming PD Us
1.3.6.1.4.1.9.9.188.1.3.4.1.10
This object represents the number of PDUs received from a roaming MS on a SGSN path. This object is deprecated and replaced with more specific objects cGtpRoamingTrustedPDPs and cGtpRoamingNonTrustedPDPs.
Back to CISCO-GTP-MIB MIB page.
IPHost Network monitor allows you to monitor cGtpRoamingPDUs on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.