This object describes the neighboring router's
capabilities.  The following shows the position
of each bit:

bit position  meaning
-----------   ------
    3         mtrace bit
    2         generationID bit
    1         prune bit
    0         leaf bit

The leaf bit indicates that the neighbor has only
one interface with neighbors.  The prune bit indicates
that the neighbor supports pruning.  The generationID bit
indicates that the neighbor sends its generationID in Probe
messages.  The mtrace bit indicates that the neighbor can
handle mtrace requests.