Brocade Communications Systems RFS6000 System Reference Manual page 27

Client move command
As a value added proprietary feature between Brocade infrastructure products and Brocade
Clients, a move command has been introduced. The move command permits an Client to roam
between ports connected to the same controller without the need to perform the full association
and authentication defined by the 802.11 standard. The move command is a simple packet
up/packet back exchange with the Access Point. Verification of this feature is dependent on its
implementation in one or more wireless clients.
Power save polling
An Client uses Power Save Polling (PSP) to reduce power consumption. When an Client is in PSP
mode, the controller buffers its packets and delivers them using the DTIM interval. The PSP-Poll
packet polls the AP for buffered packets. The PSP null data frame is used by the Client to signal the
current PSP state to the AP.
QoS
QoS provides a data traffic prioritization scheme. QoS reduces congestion from excessive traffic.
If there is enough bandwidth for all users and applications (unlikely because excessive bandwidth
comes at a very high cost), then applying QoS has very little value. QoS provides policy enforcement
for mission-critical applications and/or users that have critical bandwidth requirements when the
controller's bandwidth is shared by different users and applications.
QoS helps ensure each WLAN on the controller receives a fair share of the overall bandwidth,
either equally or as per the proportion configured. Packets directed towards Clients are classified
into categories such as Management, Voice and Data. Packets within each category are processed
based on the weights defined for each WLAN.
The controller supports the following QoS mechanisms:
802.11e QoS
802.11e enables real-time audio and video streams to be assigned a higher priority over data
traffic. The controller supports the following 802.11e features:
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802.1p support
802.1p is a standard for providing QoS in 802-based networks. 802.1p uses three bits to allow
controllers to re-order packets based on priority level.
Brocade Mobility RFS6000 and RFS7000 System Reference Guide
53-1001858-01
Basic WMM
WMM Linked to 802.1p Priorities
WMM Linked to DSCP Priorities
Fully Configurable WMM
Admission Control
Unscheduled-APSD
TSPEC Negotiation
Block ACKQBSS Beacon Element
Software overview
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