Alcatel-Lucent 7950 Quality Of Service Manual page 562

Advanced Policy QoS Commands
observed, the hold timer is canceled and the higher offered rate is used immediately.
A possible reason to define a hold timer for an offered rate is to allow a child queue is to dampen the effects
of a child with a fluctuating rate on the virtual scheduler. This works similar to the max-decrement in that the
child holds on to bandwidth from the virtual scheduler in case it may be needed in the near future.
This parameter has no effect on an increase to the child's offered rate. If the rate increase is above the change
sensitivity, the new offered rate is immediately used.
When this command is not specified or removed, the virtual scheduler immediately reacts to measured
decreases in offered load.
The no form of this command is used to remove any currently configured hold time for all child policers and
queues associated with the policy. When the hold time is removed, any current hold timers for child policers
are automatically canceled.
Parameters
seconds — The hold time configured must be specified in seconds. A value of 0 is equivalent to no high-
rate-hold-time.
Default
Values
active-min-only — When this optional parameter is specified, the high-rate-hold-time command will
accept the optional active-min-only parameter. Attempting to remove the active-min-only parameter
from the add command, or removing the add command itself, will fail while active-min-only is
enabled on the high-rate-hold-time command. When specified, the respective rate or percentage is
treated as the minimum offered rate for a queue only when the queue has an actual non-zero offered
rate. This is intended to limit the artificial increase in offered rate to queues that are currently active.
Once a queue's measured offered rate drops to zero, the system stops enforcing the minimum value.
time-average-factor
Syntax [no] time-average-factor taf-value [dec-only]
Context config>qos>adv-config-policy>child-control>offered-measurement
Description
This command is used to weight the new offered rate with a portion of the previous offered rate. It would be
expected that this command would mainly be used with the dec-only option enabled.
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.
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7950 XRS Quality of Service Guide