Configuring qos wmm settings – Brocade Mobility Access Point System Reference Guide (Supporting software release 5.5.0.0 and later) User Manual
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Brocade Mobility Access Point System Reference Guide
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NOTE
When using a wireless client classification other than WMM, only legacy rates are supported on that
WLAN.
Either select the Add button to define a new WLAN QoS policy, or select an existing WLAN QoS
policy and Edit its configuration. Existing QoS policies can also be selected and deleted as needed.
A Quality of Service (QoS) policy screen displays for the new or selected WLAN. The screen displays
the WMM tab by default, but additional tabs also display for WLAN and wireless client rate limit
configurations. For more information, refer to the following:
•
•
Configuring a WLAN’s QoS Rate Limit Settings
•
Configuring Multimedia Optimizations
Configuring QoS WMM Settings
Using WMM, end-user satisfaction is maintained in a wider variety of environments and traffic
conditions. WMM makes it possible for both home networks and Enterprises to decide which data
streams are most important and assign them a higher priority.
WMM’s prioritization capabilities are based on four access categories. The higher the access
category, the higher the probability to transmit this kind of traffic over the access point managed
WLAN. ACs were designed to correspond to 802.1d priorities to facilitate interoperability with QoS
policy management mechanisms. WMM enabled access points coexist with legacy devices (not
WMM-enabled).
Packets not assigned to a specific access category are categorized by default as having best effort
priority. Applications assign each data packet to a given access category packets are then added to
one of four independent transmit queues (one per access category - voice, video, best effort or
background) in the client. The client has a collision resolution mechanism to address collision
among different queues, which selects the frames with the highest priority to transmit.
SVP Prioritization
A green check mark defines the policy as having Spectralink Voice Prioritization (SVP) enabled to
allow the access point to identify and prioritize traffic from Spectralink/Polycomm phones using the
SVP protocol. Phones using regular WMM and SIP are not impacted by SVP prioritization. A red “X”
defines the QoS policy as not supporting SVP prioritization.
WMM Power Save
Enables support for the WMM based power-save mechanism, also known as Unscheduled
Automatic Power Save Delivery (U-APSD). This is primarily used by WMM capable voice devices. The
default setting is enabled.
Multicast Mask Primary
Displays the primary multicast mask defined for each listed QoS policy. Normally all multicast and
broadcast packets are buffered until the periodic DTIM interval (indicated in the 802.11 beacon
frame), when clients in power save mode wake to check for frames. However, for certain
applications and traffic types, an administrator may want the frames transmitted immediately,
without waiting for the DTIM interval. By configuring a primary and secondary multicast mask, an
administrator can indicate which frames are transmitted immediately. Setting masks is optional,
and only needed if there are traffic types requiring special handling.
Multicast Mask
Secondary
Displays the secondary multicast mask defined for each listed QoS policy.