With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGgsnHistNotifTable
Cisco Ggsn History Notification Table
1.3.6.1.4.1.9.9.240.1.2.7
A history table of the most recent cGgsnNotification notifications generated by this device. If a new cGgsnNotification notification is generated when the number of entries is equal to cGgsnHistNotifMaxLength, then the oldest entry is deleted and replaced with an entry for the latest notification.
Back to CISCO-GGSN-MIB MIB page.
IPHost Network monitor allows you to monitor cGgsnHistNotifTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.