With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
ifStackHigherLayer
if Stack Higher Layer
1.3.6.1.2.1.31.1.2.1.1
The value of ifIndex corresponding to the higher sub-layer of the relationship, i.e., the sub-layer which runs on 'top' of the sub-layer identified by the corresponding instance of ifStackLowerLayer. If there is no higher sub-layer (below the internetwork layer), then this object has the value 0.
Back to ibm_mainframe-Ifmib MIB page.
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