This object contains an appropriate value to
be used for jnxMplsLdpEntityIndex when creating
entries in the jnxMplsLdpEntityTable. The value
0 indicates that no unassigned entries are
available. To obtain the jnxMplsLdpEntityIndex
value for a new entry, the manager issues a
management protocol retrieval operation to obtain
the current value of this object. After each
retrieval, the agent should modify the value to
the next unassigned index.