With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoDlswDirLocateMacMatch
cisco Data Link Switching Directory Locate Mac Match
1.3.6.1.4.1.9.10.9.1.4.3.1.1.2
The order of the entries of ciscoDlswDirMacTable that match ciscoDlswDirLocateMacMac. A value of one represents the entry that best matches the MAC address. A value of two represents the second best matched entry. A GET-NEXT of the value of the least matched entry will return an object instance outside of this table.
Back to CISCO-DLSW-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoDlswDirLocateMacMatch 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.