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Aironet Wireless Communications, Inc. 3-8 Confidential and Proprietary
Class 2 frames (if and only if authenticated; allowed from within state 2 and state 3 only):
Management frames:
• Association Request/Response
Successful association enables Class 3 frames.
Unsuccessful association leaves station in state 2.
• Reassociation Request/Response
Successful reassociation enables Class 3 frames.
Unsuccessful reassociation leaves the station in State 2 (with respect to the station which
was sent the reassociation message). Reassociation frames shall only be sent if the
sending station is already associated in the same ESS.
• Disassociation
Disassociation notification when in state 3 changes a station’s state to state 2. This
station must become associated again if it wishes to utilize the DS.
If station A receives a class 2 frame with a unicast address in the Address 1 field from station B which is
not authenticated with station A, station A will send a deauthentication frame to station B.
Class 3 frames (if and only if associated; allowed only from within State 3):
Data frames:
• Data subtypes
Data frames allowed. That is, either the "To DS" or "From DS" FC control bits may be
set to true to utilize DS Services.
Management frames:
• Deauthentication
Deauthentication notification when in state 3 implies disassociation as well, changing
the station’s state from 3 to 1. The station must become Authenticated again prior to
another association.
Control frames:
• PS-Poll
If station A receives a class 3 frame with a unicast address in the Address 1 field from station B which is
authenticated but not associated with station A, station A will send a disassociation frame to station B.
If station A receives a class 3 frame with a unicast address in the Address 1 field from station B which is
not authenticated with station A, station A will send a deauthentication frame to station B.
(The use of the word “receive” refers to a frame which meets all of the filtering criteria specified in
sections 8 and 9 of the 802.11 specification.)