An entry is created or removed whenever a interface
related configuation operation is performed
under the OSPF process.
For Example : Ethernet1/0 interface has ifIndex value as 5. The
ifIndex of 5 is a passive interface of particular OSPF process
which copies the name of the particular interface to this
object . Based on this example Ethernet1/0 is going copy
to the object. Otherwise ifIndex is not a
passive interface this object content will
be NULL.