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In LLC/SNAP encapsulation the SNAP header is preceded by a LLC header that consists of the 3 bytes
AA AA 03
specifying a U-type LLC frame with SNAP as both the SSAP and DSAP protocols, and the rest of the control field set to zero.
The 5 byte SNAP header itself then follows, in the following format:
For the special case of ARP and IP packet encapsulation, the Organization Code is set to zero, and the EtherType information is stored in the 16-bit Local Code field.
Thus, the LLC/SNAP headers are 8 bytes long in total. This reduces the size of the available payload for protocols such as the Internet Protocol to 1492 bytes, compared to the use of the Ethernet II framing[?].
References:
External links:
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