hpicfIpv6RtrAdvPrefixIfIndex 1.3.6.1.4.1.11.2.14.11.5.1.15.1.9.2.1.1

The index value which uniquely identifies the interface on which this prefix is configured. The interface identified by a particular value of this index is the same interface as identified by the same value of the IF-MIB's ifIndex.