This object contains an appropriate value to be used
for hpnicfmplsXCIndex when creating entries in the
hpnicfmplsXCTable. The value 0 indicates that no
unassigned entries are available. To obtain the
value of hpnicfmplsXCIndex for a new entry in the
hpnicfmplsXCTable, the manager issues a management
protocol retrieval operation to obtain the current
value of hpnicfmplsXCIndex. After each retrieval
operation, the agent should modify the value to
reflect the next unassigned index. After a manager
retrieves a value the agent will determine through
its local policy when this index value will be made
available for reuse.