Brocade Mobility RFS Controller CLI Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 1093)

Brocade Mobility RFS Controller CLI Reference Guide 1085
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Usage Guidelines:
Before defining a radio QoS policy, refer to the following deployment guidelines to ensure the
configuration is optimally effective:
• To support QoS, each multimedia application, wireless client, and WLAN is required to support
WMM.
• WMM enabled clients can co-exist with non-WMM clients on the same WLAN. Non-WMM
clients are always assigned a Best Effort access category.
• Brocade recommends default WMM values be used for all deployments. Changing these
values can lead to unexpected traffic blockages, and the blockages might be difficult to
diagnose.
• Overloading an access point radio with too much high priority traffic (especially voice)
degrades overall service quality for all users.
• TSPEC admission control is only available with newer voice over WLAN phones. Many legacy
voice devices do not support TPSEC or even support WMM traffic prioritization.
Example
rfs7000-37FABE(config-radio-qos-test)#wmm best-effort aifsn 7
rfs7000-37FABE(config-radio-qos-test)#wmm voice txop-limit 1
rfs7000-37FABE(config-radio-qos-test)#show context
radio-qos-policy test
wmm best-effort aifsn 7
wmm voice txop-limit 1
admission-control voice max-airtime-percent 9
admission-control voice reserved-for-roam-percent 8
accelerated-multicast stream-threshold 15
rfs7000-37FABE(config-radio-qos-test)#
cw-min <0-15> Clients select a number between 0 and the min contention window to wait before retransmission.
Clients then double their wait time on a collision, until it reaches the maximum contention window.
•
background – Sets CW Min for low (background) traffic. The default is 4.
•
best-effort – Sets CW Min for normal (best effort) traffic. The default is 4.
•
voice – Sets CW Min for voice traffic. The default is 2.
•
video – Sets CW Min for video traffic. The default is 3.
The following keyword is common to all of the above traffic types:
•
<0-15> – ECW: the contention window. The actual value used is (2^ECW - 1).
NOTE: Lower values are used for higher priority traffic (like video and voice) and higher values are
used for lower priority traffic (like background and best-effort).
txop-limit
<0-65535> Set the interval, in microseconds, during which a particular client has the right to initiate transmissions
•
background – Sets TXOP for low (background) traffic. The default is 0.
•
best-effort – Sets TXOP for normal (best effort) traffic. The default is 4.
•
voice – Sets TXOP for voice traffic. The default is 47.
•
video – Sets TXOP for video traffic. The default is 94.
The following keyword is common to all of the above traffic types:
•
<0-65535> – Specify a value from 0 - 65535 to configure the transmit opportunity limit in 32
microsecond units.
NOTE: Lower values are used for higher priority traffic (like video and voice) and higher values are
used for lower priority traffic (like background and best-effort).