Subnetwork Access Protocol

Subnetwork Access Protocol

Subnetwork Access Protocol

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The Subnetwork Access Protocol (SNAP) is a mechanism for multiplexing, on networks using IEEE 802.2 LLC, more protocols than can be distinguished by the 8-bit 802.2 Service Access Point (SAP) fields. SNAP supports identifying protocols by Ethernet type field values; it also supports vendor-private protocol identifier spaces. It is used with IEEE 802.3, IEEE 802.4, IEEE 802.5, IEEE 802.11 and other IEEE 802 physical network layer, as well as with non-IEEE 802 physical network layers such as FDDI that use 802.2 LLC.

SNAP is included in an extension of the 802.2 LLC header; it is specified in the document. A packet with an LLC header with a destination SAP of hexadecimal AA or AB and a source SAP of hexadecimal AA or AB is a SNAP packet. The SNAP header follows the 802.2 header; it has a 5-octet protocol identification field, consisting of a 3-octet IEEE Organizationally Unique Identifier (OUI) followed by a 2-octet protocol ID. If the OUI is hexadecimal 000000, the protocol ID is the Ethernet type (EtherType) field value for the protocol running on top of SNAP; if the OUI is an OUI for a particular organization, the protocol ID is a value assigned by that organization to the protocol running on top of SNAP.

SNAP is usually used with Unnumbered Information 802.2 protocol data units (PDUs), with a control field value of hexadecimal 03, and the LSAP values are usually hexadecimal AA, so the 802.2 LLC header for a SNAP packet is usually AA AA 03; however, SNAP can be used with...
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