Install guide

1-30 set wanlb abd Release Note
Software Version 2.7.5
C613-10454-00 REV A
set wanlb abd
Syntax SET WANLB ABD [RESOLution=200..5000]
[UPDAteinterval=1..1440] [DECReasethreshold=0..75]
[TRAFfic={TOTal|INBound|OUTBound}]
Description This command sets the parameters for adaptive bandwidth detection (ABD)
that are used to update the weight of resources. To apply this command you
must first set the weight parameter of the add wanlb resource command on
page 1-17, to perfectautomatic.
ABD estimates the available bandwidth for a WAN load balancer resource by
observing the resource's peak throughput. The maximum detected throughput
is then used as the resource's weight for the next update interval. The
resource's weight for the first update interval is set to 10000 (the default
resource weight). “Perfect Automatic Weight” on page 1-7.
Note that the detected bandwidth does not restrict the amount of traffic the
resource is actually capable of transmitting. However, it does influence how
often the resource will be selected.
Parameter Description
RESOLution The resolution period, in milliseconds, over which a resource's
throughput is observed. At the end of each resolution period the
average throughput (in kbps) is calculated for the resource based
on the results obtained. The maximum value of the averages
detected during an update interval is then used to estimate the
weighting to apply for the next update interval. ABD is more likely
to detect a higher peak throughput for smaller resolution periods.
However, smaller resolution periods may incur more CPU
overhead.
Default: 1000
UPDAteinterval The interval in minutes for updating the weight of a resource. The
maximum throughput detected over the last update interval is
used as the resource's weight for the next update interval. A lower
update interval will mean the resource's weight will change more
adaptively as the detected throughput changes.
Default: 60
DECReasethreshold The threshold that determines whether a resource's weight should
be updated if a decrease in throughput is detected. The threshold
relates to the percentage decrease between the current maximum
throughput detected for a resource, and its current weight (which
is the maximum throughput detected for the previous update
interval). If the percentage decrease is greater than the threshold,
the resource's weight is not updated. If zero is specified, then the
weights for resources will never decrease.
Note that in addition to throughput decreasing due to problems or
congestion, it can also decrease due to lack of traffic.
Default: 50