snap(6P)                         DG/UX R4.11                        snap(6P)


NAME
       snap - Subnetwork Access Protocol

DESCRIPTION
       SNAP is part of the 802.1 layer.  SNAP provides a way for protocols
       that run over Ethernet to run over 802.x media.  The SNAP sub-layer
       contains a five byte header that can be used to specify additional
       information for upper layers.  The first three bytes of the header
       represents an organizationally unique identifier (OUI) while the last
       two bytes are locally administered.  This structure allows different
       vendors the flexibility to use the additional bytes of the header as
       they wish.

       One use of SNAP that has been commonly agreed upon is to use an OUI
       of 0 to represent upper layer protocols that run over an Ethernet
       based media.  The two bytes that are locally administered are then
       used to represent the two byte ether type field.  In this manner,
       protocols that run over Ethernet are able to use the SNAP layer to
       run over 802.2 (LLC) and 802.x MAC layers.  Data General provides the
       SNAP functionality in the form of the SNAP pseudo-driver.

SEE ALSO
       ifconfig(1M), netinit(1M), dgen(7), hken(7), inen(7), llc(7).


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