Alcatel-Lucent 7450 Quality Of Service Manual page 875

priority-mbs-thresholds
Syntax priority-mbs-thresholds
Context config>qos>policer-control-policy>root
Description The priority-mbs-thresholds command contains the root arbiter parent policer's min-thresh-
separation command and each priority level's mbs-contribution command that is used to internally
derive each priority level's shared-portion and fair-portion values. The system uses each priority
level's shared-portion and fair-portion value to calculate each priority level's discard-unfair and
discard-all MBS thresholds that enforce priority sensitive rate-based discards within the root arbiter's
parent policer.
The priority-mbs-thresholds CLI node always exists and does not need to be created.
Default None.
min-thresh-separation
Syntax min-thresh-separation size [bytes | kilobytes]
no min-thresh-separation
Context config>qos>policer-control-policy>root>priority-mbs-thresholds
Description
The min-thresh-separation command defines the minimum required separation between each in-use
discard threshold maintained for each parent policer context associated with the policer-control-policy.
The min-thresh-separation value may be overridden on each SAP or sub-profile to which the policy is
applied.
The system uses the default or specified min-thresh-separation value in order to determine the
minimum separation required between each of the of the parent policer discard thresholds. The system
enforces the minimum separation based on the following behavior in two ways. The first is
determining the size of the shared-portion for each priority level (when the mbs-contribution
command's optional fixed keyword is not specified):
The second function the system uses the min-thresh-separation value for is determining the value per
priority level for the fair-portion:
Quality of Service Guide
• When a parent policer instance's priority level has less than two child policers associated, the
shared-portion for the level will be zero.
• When a parent policer instance's priority level has two or more child policers associated, the
shared-portion for the level will be equal to the current value of min-thresh-separation.
• When a parent policer instance's priority level has no child policers associated, the fair-
portion for the level will be zero.
• When a parent policer instance's priority level has one child policer associated, the fair-
portion will be equal to the maximum of the min-thresh-separation value and the priority
level's mbs-contribution value.
Class Fair Hierarchical Policing (CFHP)
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