With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
Cisco Domain Management Area Assigned Port Id List
The list of Port IDs which have been assigned in this Area and VSAN, formatted as an array of octets in ascending order. There could be zero or more Port IDs assigned on this Area and VSAN. Port ID is an 8-bit value. And therefore, each octet represents one Port ID. So, the list containing the Port IDs 23, 45, 235 and 56 would be formatted as the 4-octet string x'172d38eb'.
Back to CISCO-DM-MIB MIB page.
IPHost Network monitor allows you to monitor dmAreaAssignedPortIdList on Cisco device via the SNMP protocol.
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Easy monitoring of dmAreaAssignedPortIdList with IPHost tools