Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 314)

302 Brocade Mobility RFS Controller System Reference Guide
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4. Configure the following parameters in respect to the intended WLAN Upstream Rate Limit, or
traffic from the controller or service platform to associated Access Point radios and connected
wireless clients:
5. Set the following WLAN Upstream Random Early Detection Threshold settings for each access
category. An early random drop is done when a traffic stream falls below the set threshold.
Enable Select the Enable check box to enable rate limiting for data transmitted from the controller or
service platform to associated Access Point radios and connected wireless clients. 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 between 50 - 1,000,000 kbps. This limit constitutes a threshold for
the maximum the number of packets transmitted or received over the WLAN (from all access
categories). Traffic that exceeds 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 between 2 - 1024 kbytes. The smaller the burst, the less likely the
upstream packet transmission will result in congestion for the WLAN’s 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 add a 10% margin (minimally) to allow for traffic bursts. The
default burst size is 64 kbytes.
Background Traffic Set a percentage value for 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 value for 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 value for 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 value for 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%.