With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
clcFdbIfMacUsage
Cisco L2 Control Fdb If Mac Usage
1.3.6.1.4.1.9.9.313.1.3.2.1.1
The usage of the MAC addresses in the specific forwarding table for this interface. It indicates the number of MAC addresses learnt or configured on this interface for a forwarding table.
Back to CISCO-L2-CONTROL-MIB MIB page.
IPHost Network monitor allows you to monitor clcFdbIfMacUsage 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.
