Named Pools QoS Policy Command Reference
736 Quality of Service Guide
The slope policy contains the High and Low WRED slope definitions that will be used by the pool on
each XMA or MDA on which the pool is created. If the slope-policy command is not executed or the
no slope-policy command is executed, the default slope policy will be associated with the pool.
The no form of the command restores the default slope policy to the named pool.
Parameters slope-policy-name — The slope-policy-name parameter is required and must specify an existing
slope policy name. If slope-policy-name does not exist, the slope-policy command will fail.
Unit: Slope Policy Name
Default Default Slope Policy
resv-cbs
Syntax resv-cbs percentage-of-pool-size amber-alarm-action step percent max maximum
resv-cbs percentage-of-pool-size
no resv-cbs
Context config>qos>named-pool-policy>q1-pools>pool
Description The resv-cbs command is used to override the default reserved CBS size of the pool. The reserved CBS
size defines the amount of buffer space within the pool that is not considered shared. When queues
request buffers from the pool, they will be either ‘within-CBS’ or ‘above-CBS’. If the queue is ‘within-
CBS’ based on the current queue depth and the configured CBS value for the queue, the requested
buffer is taken from the reserved portion of the buffer pool. After the queues depth is beyond its
configured CBS, the buffer will be taken from the pools shared space. Shared space buffers are subject
to the WRED slope function within the buffer pool. If the WRED slopes are enabled, the buffer request
may be denied based on WRED drop probability.
The default reserved CBS size of the pool is 30%.
The no form of the command restores the default reserved CBS size of 30%.
Parameters percentage-of-pool-size — The percentage-of-pool-size parameter is required and is an integer
specifying a percentage from 0 to 100 percent. Specifying a value of 30 (the default) is
equivalent to specifying no resv-cbs.
Values 0 to 100
Default 30
amber-alarm-action step percent — specifies the percentage step-size for the reserved CBS size
of the pool. When using the default value, the adaptive CBS sizing is disabled. To enable
adaptive CBS sizing, step percent must be set to non-default value along with the max
parameter. When reserved CBS is default adaptive CBS sizing cannot be enabled. The
reserved CBS (Committed Burst Size) defines the amount of buffer space within the pool that
is not considered shared.
Values 1 to 100
Default 0
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