With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
llcPortOperName
llc Port Operation Name
1.3.6.1.3.51.1.1.2.1.1
An octet string that describes the physical port to which this interface is currently attached. It has implementation-specific significance.
Back to ibm-llc MIB page.
IPHost Network monitor allows you to monitor llcPortOperName on IBM device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring IBM computers right now.