With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dmAreaEntry
Cisco Domain Management Area Entry
1.3.6.1.4.1.9.9.302.1.2.1.1
An entry gives information on the Area ID and all Port IDs that were assigned for within an area for a particular VSAN.
Back to CISCO-DM-MIB MIB page.
IPHost Network monitor allows you to monitor dmAreaEntry 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.