With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGgsnSACsgOutboundOctets
Cisco Ggsn Service-Aware Content Services Gateway Outbound Octets
1.3.6.1.4.1.9.9.497.1.1.1.2
The aggregate number of echo request, echo response, and node alive messages sent in terms of octets. This object is deprecated and replaced by cGgsnSACsgStatsOutboundOctets.
Back to CISCO-GGSN-SERVICE-AWARE-MIB MIB page.
IPHost Network monitor allows you to monitor cGgsnSACsgOutboundOctets 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.