With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGgsnExtUpstreamByteCount
cisco Gateway GPRS Support Node Ext Upstream Byte Count
1.3.6.1.4.1.9.9.647.1.1.13.1.3
This object indicates the total number of upstream traffic bytes sent in the last sampling period specified by cGgsnExtThruputInterval.
Back to CISCO-GGSN-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cGgsnExtUpstreamByteCount on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.
