Frame Detail: INFO

The INFO field is the meat of the frame. The frame is essentially built around this field, and is merely a mechanism for getting the info from one station to another.

You can tell what kind of information is contained in the INFO field by noting the Frame Control of the frame.

X'50' indicates an LLC frame, so the INFO field of a frame with a FC of X'50' will contain an LLC header followed by other upper layer headers (i.e. SNAP, ARP, IP, TCP, SNMP, etc.).
A frame with an FC of X'41' or X'4F' will contain SMT (Station Management) information. Thus, you will see an SMT header followed by SMT information.
A frame with an FC of X'C2' or X'C3' is a MAC frame, and the info field will contain information relevant to the MAC protocol.

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