Brocade Mobility Access Point System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 456)

446 Brocade Mobility Access Point System Reference Guide
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4. Configure the following intended Upstream Rate Limit parameters for the selected WLAN:
5. Set the following Upstream 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 the selected WLAN.
Enable Select this radio button to enable rate limiting for data transmitted from access point radios to
associated clients on this WLAN. Enabling this option does not invoke rate limiting for data traffic in
the downstream 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 number of packets transmitted or received over the WLAN (from all access categories).
Traffic exceeding the defined rate is dropped and a log message is generated. The default setting is
5000 kbps.
Maximum Burst Size Set a maximum burst size from 2 - 1024 kbytes. The smaller the burst, the less likely the upstream
packet transmission will result in congestion for the WLAN’s wireless client destinations. 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 320 kbytes.
Background Traffic Set a percentage for WLAN background traffic in the upstream 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 upstream rate is known by
the network administrator (using a time trend analysis). The default threshold is 50%.
Best Effort Traffic Set a percentage for WLAN best effort traffic in the upstream direction. This is a percentage of the
maximum burst size for normal priority 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 upstream rate is known by the network administrator
(using a time trend analysis). The default threshold is 50%.
Video Traffic Set a percentage for WLAN video traffic in the upstream 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 upstream rate is known by the network administrator (using a time
trend analysis). The default threshold is 25%.
Voice Traffic Set a percentage for WLAN voice traffic in the upstream 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%.