With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cegActivatedGtpv2PgwSessions
Evolved Packet Core Gateway Activated Gtpv2 Pgw Sessions
1.3.6.1.4.1.9.9.731.1.3.12
This object represents the total number of activated GTPV2 sessions in PGW mode.
Back to CISCO-EPC-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cegActivatedGtpv2PgwSessions on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.