With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cseL2StatsTable
CISCO SWITCH ENGINE L2 Stats Table
1.3.6.1.4.1.9.9.97.1.1.1
A table containing switching engine's L2 statistics counters.
Back to CISCO-SWITCH-ENGINE-MIB MIB page.
IPHost Network monitor allows you to monitor cseL2StatsTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.