With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
c2900PortNumberOfDroppedAddresses
Cisco 2900 Port Number Of Dropped Addresses
1.3.6.1.4.1.9.9.87.1.4.1.1.14
The number of times an address could not be learned or assigned for the port because its address table was full at one time.
Back to CISCO-C2900-MIB MIB page.
IPHost Network monitor allows you to monitor c2900PortNumberOfDroppedAddresses on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.
