The frame format used for routing frames on this IPX interface. The framing
formats are for ethernet ports. There are two frame formats for FDDI ports:
802.2 and FDDI SNAP. The correct FDDI format is automatically chosen if
this interface is associated with a VLAN interface that contains both ethernet
and FDDI ports. If the VLAN interface is an FDDI port, than the only
values that can be written to this object are: frame-802-2(2) and
frame-SNAP(4).