This object is the index that uniquely identifies an entry in
the cefexBindingTable. The value of this object is an IfIndex
to a fabric port. By creating a row in this table for
a particular core switch interface, the user enables that
core switch interface to accept a fabric extender. By default,
a core switch interface does not have an entry in this table
and consequently does not accept/respond to discovery
requests from fabric extenders.