IBM networks systems have a special translation called 'IBM
LLC Encapsulation' which is used for translating IBM LLC based
protocols between Token Ring and Ethernet Version 2.0 (DIXE)
format. This translation does not apply when going between Token
Ring and 802.3, since LLC SAPs are maintained. This translation
allows connectivity between Token stations separated by an
Ethernet segment in an internetwork environment. An Ethernet
protocol type of 80 D5 is used to indicate IBM LLC protocol
encapsulation.
When enabled(1) all frames outbound on this token ring port and
with an LSAP value of 04 (SNA path control) and where the packet
originated on an ethernet network will have the IBM LLC protocol
field of five bytes stripped from the packet.
When disabled(2) the IBM LLC protocol field is untouched on these
packets.
The default value for this object is product specific. A write of
notsupported (1) will have no affect.