Brocade Mobility Access Point System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 495)

Brocade Mobility Access Point System Reference Guide 485
53-1003100-01
6
6. Configure the following parameters in respect to the intended From Air Upstream Rate Limit, or
traffic from the controller to associated access point radios and their associated neighbor:
7. Set the following Receive Random Early Detection Threshold settings for each access category.
An early random drop is done when a traffic stream falls below the set threshold.
Mesh Tx Rate Limit Select this option to enable rate limiting for all data received from any mesh point in the mesh. This
feature is disabled by default.
Rate Define a receive rate limit from 50 - 1,000,000 kbps. This limit constitutes a threshold for the
maximum the number of packets transmitted or received over the mesh point (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 from 2 - 1024 kbytes. The smaller the burst, the less likely the transmit
packet transmission will result in congestion for the mesh point’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 then add a 10% margin (minimally) to allow for traffic bursts at the site. The
default burst size is 320 kbytes.
Background Traffic Set a percentage value for background traffic in the transmit 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 transmit 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 transmit 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 transmit 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 transmit 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 transmit 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 transmit 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%.