| Description | This value represents either the InterfaceIndex
or 0 (zero). The value of zero means that the
InterfaceIndex is not known.
However, if the InterfaceIndex is known, then it must
be represented by this value.
If an InterfaceIndex becomes known, then the
network management entity (e.g., SNMP agent) responsible
for this object MUST change the value from 0 (zero) to the
value of the InterfaceIndex. If an ATM Label is
being used in forwarding data, then the value of this
object MUST be the InterfaceIndex. |