With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cagwEthGreSentDataBytes
Cisco's ASN Gateway Ethernet Gre Sent Data Bytes
1.3.6.1.4.1.9.9.638.1.3.1.1.1.77
The number of data bytes sent by the ASN-GW on ethernet convergence sublayer.
Back to CISCO-ASN-GATEWAY-MIB MIB page.
IPHost Network monitor allows you to monitor cagwEthGreSentDataBytes 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.