Coordinate ifIndex value allocation for entries in
juniPPPoEServiceNameTableTable.
A GET of this object returns the next available ifIndex value to be used
to create an entry in the associated service-name table table; or zero,
if no valid ifIndex value is available. This object also returns a
value of zero when it is the lexicographic successor of a varbind
presented in an SNMP GETNEXT or GETBULK request, for which circumstance
it is assumed that ifIndex allocation is unintended.
Successive GETs will typically return different values, thus avoiding
collisions among cooperating management clients seeking to create table
entries simultaneously.