The MIB module which provides the Inverted Stack Table for interface sub-layers. not-accessible current 1.3.6.1.2.1.77.1.1.1 Information on a particular relationship between two sub- layers, specifying that one sub-layer runs underneath the other sub-layer. Each sub-layer corresponds to a conceptual row in the ifTable. read-only current 1.3.6.1.2.1.77.1.1.1.1 The status of the relationship between two sub-layers. An instance of this object exists for each instance of the ifStackStatus object, and vice versa. For example, if the variable ifStackStatus.H.L exists, then the variable ifInvStackStatus.L.H must also exist, and vice versa. In addition, the two variables always have the same value. However, unlike ifStackStatus, the ifInvStackStatus object is NOT write-able. A network management application wishing to change a relationship between sub-layers H and L cannot do so by modifying the value of ifInvStackStatus.L.H, but must instead modify the value of ifStackStatus.H.L. After the ifStackTable is modified, the change will be reflected in this table. 1 2 -- the following value is a state: -- this value may be read, but not written 3 -- the following three values are -- actions: these values may be written, -- but are never read 4 5 6