Oracle SuperCluster T5-8 Owner's Manual page 321

As shown in the preceding graphic, each leaf switch in rack 1 connects to the following
switches:
Four connections to its internal spine switch
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Four connections to the spine switch in rack 2
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The spine switch in rack 1 connects to the following switches:
Eight connections to both internal leaf switches
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Eight connections to both leaf switches in rack 2
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The following terms are used when referring to the two racks:
Rack 1 (R1) refers to Oracle SuperCluster T5-8
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Rack 2 (R2) refers to the Oracle Exadata Storage Expansion Rack
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In addition, because the InfiniBand switches are physically located in different rack units in the
two racks, the following terms are used when referring to the InfiniBand switches:
InfiniBand 1 (IB1) refers to the spine switch, located in U1 in both racks
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InfiniBand 2 (IB2) refers to the first leaf switch, located in:
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U26 in Oracle SuperCluster T5-8
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U20 in the Oracle Exadata Storage Expansion Rack
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InfiniBand 3 (IB3) refers to the second leaf switch, located in:
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Connecting an Expansion Rack to Oracle SuperCluster T5-8
Connecting Expansion Racks 321