With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
ifStackEntry
if Stack Entry
1.3.6.1.2.1.31.1.2.1
Information on a particular relationship between two sub-layers, specifying that one sub-layer runs on 'top' of the other sub-layer. Each sub-layer corresponds to a conceptual row in the ifTable.
Back to ibm_mainframe-Ifmib MIB page.
IPHost Network monitor allows you to monitor ifStackEntry on IBM device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring IBM switches right now.