With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
parConnLocalPort
par Connection Local Port
1.3.6.1.4.1.351.130.3.1.1.2
This object specifies the port number part of the local endpoint connection address.
Back to CISCO-WAN-PAR-MIB MIB page.
IPHost Network monitor allows you to monitor parConnLocalPort on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.