Information Technology Reference
In-Depth Information
802.11e:
Frame queuing and packet prioritization
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802.11i:
MAC layer data encryption/decryption
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Controller MAC functions are
802.11 MAC Management:
Association requests and actions
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802.11e Resource Reservation:
To r e s e r v e r e s o u r c e s fo r s p e c i f i c a p p l i c a t i o n s
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802.11i:
Authentication and key management
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Local MAC
CAPWAP supports local MAC. Local MAC moves the MAC management from the WLC
to the local AP. This allow for termination of client traffic at the wired port of the AP. The
functionality is useful for small and remote branch offices, which would not require a WLC.
LWA P M AC f u n c t i o n s a r e
802.11:
Beacons, probe response
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802.11 Control:
Packet acknowledgment and transmission
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802.11e:
Frame queuing and packet prioritization
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802.11i:
MAC layer data encryption/decryption
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802.11 MAC Management:
Association requests and actions
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Controller MAC functions are
802.11:
Proxy association requests and actions
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802.11e Resource Reservation:
To r e s e r v e r e s o u r c e s fo r s p e c i f i c a p p l i c a t i o n s
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802.11i:
Authentication and key management
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Figure 5-5 shows the difference between an autonomous AP and a CAPWAP using WLC.
Autonomous APs act as a 802.1Q translational bridge with a trunk to the LAN switch. In
CAPWAP with WLC, the AP uses a CAPWAP tunnel, and the WLC establishes the
802.1Q trunk to the LAN switch.
AP Modes
APs operate in one of six different modes:
Local mode:
This is the default mode of operation. In this mode, every 180 seconds
the AP measures noise floor and interference, and scans for IDS events. This scanning
activity occurs on unused channels and lasts for 60 milliseconds.
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Key
To p i c
Hybrid Remote Edge AP (H-REAP) mode:
This mode enables an LWAP to reside
across a WAN link and still be able to communicate with the WLC and provide the
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supported on Cisco 1130, 1140, 1240AB, and 1250AG series LWAPs.
