With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
srpMACSideEntry
srp MAC Side Entry
1.3.6.1.4.1.9.10.60.1.2.1
A list of information specific to a particular side of a particular SRP interface.
Back to CISCO-SRP-MIB MIB page.
IPHost Network monitor allows you to monitor srpMACSideEntry 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.