With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cmsPortId
cms Port Id
1.3.6.1.4.1.9.9.721.1.1.2.1.2
This object indentifies the port. Depending on the cmsPortType this object will uniquely identify the port accordingly with the definition of the TC CiscoMldPortIdentifier.
Back to CISCO-MLD-SNOOPING-MIB MIB page.
IPHost Network monitor allows you to monitor cmsPortId on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.