This object reports the status of a stacking relationship between two interface sub-layers, mirroring the standard MIB-II ifStackTable's entries but indexed in the opposite, lower-to-higher, direction; unlike the standard table this one is read-only, and any actual changes must be made through the real ifStackStatus object instead. An admin reads this table when looking up sub-layer relationships starting from the lower layer, rather than the higher layer as the standard table requires, but must make changes elsewhere. For example, for a VLAN interface stacked over a physical port, juniIfInvStackStatus reports the same active status as the corresponding standard ifStackStatus entry, just indexed from the physical port's side.