With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwUserGrpIpGreBytesReceived
Cisco's ASN Gateway User Group Ip Gre Bytes Received
1.3.6.1.4.1.9.9.638.1.3.4.1.1.18
Total number of bytes received by this user group on IP convergence sublayer.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cagwUserGrpIpGreBytesReceived 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.