With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
addressMapGroup
address Map Group
1.3.6.1.2.1.16.20.2.3
Lists MAC address to network address bindings discovered by the probe and what interface they were last seen on.
Back to RMON2-MIB MIB page.
IPHost Network monitor allows you to monitor addressMapGroup 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.