With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGtpv2TotalN3Retransmits
Cisco Gtpv2 Total N3 Retransmits
1.3.6.1.4.1.9.9.734.1.1.1.10
This object represents the total number of N3 retransmits that has occured in the gateway.
Back to CISCO-GTPV2-MIB MIB page.
IPHost Network monitor allows you to monitor cGtpv2TotalN3Retransmits 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.