With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
portLineNum
port Line Num
1.3.6.1.4.1.351.110.5.1.1.1.1.1.1.2
This object represents the physical line number on which the frame relay port need to be created. For Service Modules, supporting ifTable, this must be the ifIndex value of the physical line or logical interface. The ifIndex entries in ifTable applicable to this category are identified by ifType values of ds3(30), ds1(18).
Back to CISCO-WAN-FR-PORT-MIB MIB page.
IPHost Network monitor allows you to monitor portLineNum on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.