This read-only value reports the topology type of the XRN-Fabric stack this unit belongs to: outofStack(1), line(2), ring(3), or mesh(4). An administrator checks this value to confirm how the physical stacking cables are arranged, for example to verify a ring topology is actually formed for its redundancy benefits, or to see that a unit is not currently stacked at all. For example, hpnicfFtmFabricType reporting ring(3) confirms the stack members are cabled in a closed ring, while outofStack(1) would indicate this particular unit isn't part of any stack.