Brocade Mobility Access Point System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 459)

Brocade Mobility Access Point System Reference Guide 449
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10. Configure the following intended Downstream Rate Limit parameters for wireless client traffic:
11. Set the following Downstream Random Early Detection Threshold settings for each access
category. An early random drop is conducted when the amount of tokens for a traffic stream
falls below the set threshold for wireless client traffic.
12.
Configuring Multimedia Optimizations
WLAN QoS Policy
To configure multimedia optimizations for a WLAN:
1. Select Configuration.
Select Wireless.
Select Wireless LAN QoS Policy to display a high level display of existing WLANs QoS policies.
2. Either select the Add button to define a new WLAN QoS policy, or select an existing WLAN QoS
policy and Edit to modify its configuration.
Enable Select this radio button to enable rate limiting for data transmitted from access point radios to
associated wireless clients. Enabling this option does not invoke rate limiting for data traffic in the
upstream direction. This feature is disabled by default.
Rate Define an upstream rate limit from 50 - 1,000,000 kbps. This limit constitutes a threshold for the
maximum the number of packets transmitted or received from clients. Traffic that exceeds the
defined rate is dropped and a log message is generated. The default setting is 1,000 kbps.
Maximum Burst Size Set a maximum burst size from 2 - 1024 kbytes. The smaller the burst, the less likely the
downstream packet transmission will result in congestion for wireless client traffic. By trending the
typical number of ARP, broadcast, multicast and unknown unicast packets over a period of time, the
average rate for each access category can be obtained. Once a baseline is obtained, administrators
should then add a minimum of a 10% margin to allow for traffic bursts at the site. The default burst
size is 64 kbytes.
Background Traffic Set a percentage for client background traffic in the downstream direction. This is a percentage of
the maximum burst size for low priority traffic. Background traffic exceeding the defined threshold
is dropped and a log message is generated. Background traffic consumes the least bandwidth of
any access category, so this value can be set to a lower value once a general downstream rate is
known by the network administrator (using a time trend analysis). The default threshold is 50%.
Best Effort Traffic Set a percentage for client best effort traffic in the downstream direction. This is a percentage of
the maximum burst size for normal traffic. Best effort traffic exceeding the defined threshold is
dropped and a log message is generated. Best effort traffic consumes little bandwidth, so this value
can be set to a lower value once a general downstream rate is known by the network administrator
(using a time trend analysis). The default threshold is 50%.
Video Traffic Set a percentage for client video traffic in the downstream direction. This is a percentage of the
maximum burst size for video traffic. Video traffic exceeding the defined threshold is dropped and a
log message is generated. Video traffic consumes significant bandwidth, so this value can be set to
a higher value once a general downstream rate is known by the network administrator (using a time
trend analysis). The default threshold is 25%.
Voice Traffic Set a percentage for client voice traffic in the downstream direction. This is a percentage of the
maximum burst size for voice traffic. Voice traffic exceeding the defined threshold is dropped and a
log message is generated. Voice applications consume significant bandwidth, so this value can be
set to a higher value once a general upstream rate is known by the network administrator (using a
time trend analysis). The default threshold is 0%. 0% means no early random drops will occur.