This is the 3-Way state of the adjacency; these values are picked to match the historical on-the-wire representation of the 3-Way state and are not intended to match ciiISAdjState. The MIB explicitly warns that this object's numeric encoding does not line up with ciiISAdjState's own numbering -- up is 0 here but 3 there -- purely to mirror the historical wire encoding, so a script comparing the two must not assume matching integers mean matching states. For example, a monitoring script naively comparing ciiISAdjState and ciiISAdj3WayState numeric values for equality would incorrectly flag a perfectly healthy adjacency, up in both but encoded as 3 and 0 respectively, as inconsistent.