Alcatel-Lucent 7450 Quality Of Service Manual page 682

Advanced QoS Policy Command Reference
The adjustment to the offered rate is performed using the following formula when taf-value is not set
to '0':
Adjusted_Rate = ((Prev_Offered_Rate x (taf-value – 1)) + New_Offered_Rate) / taf-value
If the dec-only option is specified, the adjustment is only applied when New_Offered_Rate is less than
the Prev_Offered_Rate. When taf-value is set to '0', the adjustment is never applied.
The no form of this command is used to remove the time average factor adjustments to new offered
rate measurements.
Parameters taf-value — The taf-value is specified as a whole number between 0 and 64. The value '0' has
dec-only — This keyword is an optional parameter. When enabled, the time average factor
sample-interval
Syntax [no] sample-interval sample-periods
Context config>qos>adv-config-policy>child-control>offered-measurement
Description This command is used to define the number of intervening sample periods before a new offered rate is
measured. The default is 4 sample periods. By decreasing the sampling interval, the system will
measure a child's new offered rate more frequently. Inversely, increasing the sampling interval causes
the child's offered rate to be measured less frequently.
The overall number of offered rate measurements the system attempts within a given timeframe is not
affected by the sample-interval command. If the system is asked to perform offered rate measurements
more often on some queues, it will take longer to get to all children.
When this command is not specified or removed, the system evaluates the offered rate of each child
after 4 sampling periods.
The no form of this command is used to restore the sampling interval default of 4 sample periods.
Parameters sample-periods — The sample-periods parameter is specified as a whole number between 1 and
684
special meaning in that it disables the time average factor adjustment and has the same effect
as no time-average-factor.
Default 0
Values
0 to 64
adjustment is only applied if the new offered rate is decreasing compared to the previous
offered rate. If the new offered rate is greater than the previous offered rate, the adjustment is
not applied.
8. The value '4' has the same effect as no time-average-factor. The value '1' represents the
fastest sampling rate available and the value '8' represents the slowest sampling period
available.
Default 4
Values 1 to 8
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