Brocade Mobility Access Point System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 496)

486 Brocade Mobility Access Point System Reference Guide
53-1003100-01
6
8. Configure the following parameters in respect to the intended To Air Downstream Rate Limit, or
traffic from neighbors to associated access point radios and the controller:
9. Set the following To Air Downstream Random Early Detection Threshold settings for each
access category. An early random drop is done when the amount of tokens for a traffic stream
falls below the set threshold.
10. Configure the following parameters in respect to the intended From Air Upstream Rate Limit for
the Neighbor Settings field.
Mesh Rx Rate Limit Select this option to enable rate limiting for all data transmitted by the device to any mesh point in
the mesh. This feature is disabled by default.
Rate Define an transmit 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 receive
packet transmission will result in congestion for the mesh point’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 value for background traffic in the receive 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 receive 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 receive 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 receive 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 receive 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 receive 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 receive 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 transmit 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.
Neighbor Rx Rate Limit Select this radio button to enable rate limiting for data transmitted from the client to its associated
access point radio and connected wireless controller. Enabling this option does not invoke client
rate limiting for data traffic in the receive direction. This feature is disabled by default.
Rate Define an transmit rate limit from 50 - 1,000,000 kbps. This limit constitutes a threshold for the
maximum the number of packets transmitted or received (from all access categories). Traffic that
exceeds the defined rate is dropped by the client and a log message is generated. The default rate
is 1,000 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 wireless client. The default burst size is 64
kbytes.