With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGgsnExtCreatedPDPs
cisco Gateway GPRS Support Node Ext Created PD Ps
1.3.6.1.4.1.9.9.647.1.1.15.1.3
This object indicates the number of PDP contexts created in the last sampling period specified by cGgsnExtCallRateInterval.
Back to CISCO-GGSN-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cGgsnExtCreatedPDPs on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.