Alcatel-Lucent 7950 Quality Of Service Manual page 563

Parameters
taf-value — The taf-value is specified as a whole number between 0 and 64. The value '0' has special
meaning in that it disables the time average factor adjustment and has the same effect as no time-
average-factor.
Default
Values
dec-only — This keyword is an optional parameter. When enabled, the time average factor 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.
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 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
Values
fast-start
Syntax [no] fast-start
Context config>qos>adv-config-policy>child-control>offered-measurement
Description
This command is used to enable fast detection of initial bandwidth on a child policer or queue associated
with the policy. Multiple offered rate counter reads may be performed per the sampling interval. The system
accumulates these counter values and evaluates the delta at the conclusion of the sampling interval. When
fast-start is enabled, the system identifies all children associated with the policy that enter the inactive state
(current offered rate is zero). Any inactive 'fast start' child that has a positive offered counter during a
sampling period bypasses the normal sampling interval and does an immediate offered rate evaluation.
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