D-Link DXS-3600 Series Cli Reference Manual page 1125

DXS-3600 Series Layer 3 Managed 10Gigabit Ethernet Switch CLI Reference Guide
weight CPWEIGHT-VALUE
sample-base SAMPLEBASE-
VALUE
min-header-octets MIN-
HEADER-VALUE
Default
The default set point for the queue is 26000 octets.
The default feedback weight is 2 to the power of 1.
The default sample base is 15000 octets.
The default minimum header size is 0.
Command Mode
Interface Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
When a priority is assigned as a CNPV by the qcn cnpv global configuration mode command the switch
will attach a CP on the corresponding outbound queue for each port. Which queue the CP is attached to
depends on CoS mapping. Because the relation between the queue ID and CP is one-to-one, the CP is
specified by the queue ID to which the CP is attached to. Use the qcn cp command to configure the
parameters for the CP.
Specify a queue ID on which no CP is attached. If the queue is not used by any CNPV, the configuration
won't take effect.
The CP monitors the transmission queue at the egress port. When you set the defense mode to disabled
for a CNPV on an interface and no other active (non-disabled) CNPVs uses the same queue ID, the
corresponding CP on that interface will be disabled. That is no CNM can be triggered at this outbound
queue.
Use this command to configure the set point (cpQSp) and weight (cpW) which play roles in the calculation
of the cpFb which is used to determine the value of the Quantized Feedback. The Quantized Feedback
(6-bit) is a field of a CNM and indicates the degree of congestion.
In other words, the cpFb has two terms. The first term is the difference between the current and the
desired queue lengths. The second is a weight factor cpW times the difference between the current and
the previous queue lengths (cpQDelta). Thus, a multiple of the first derivative of the queue size is
subtracted from the current non-optimality of the queue, so that if the queue length is moving toward the
set point cpQSp, the cpFb will be closer to 0 than if the queue length is moving away from the cpQSp.
Use this command to configure the CP's settings in the interface configuration mode.
This command only takes effect when the QCN is enabled globally.
Example
This example shows how to configure the CP for interface Ethernet 1/0/1.
Switch# configure terminal
total number of octets stored in the queue at this set point. The valid
set point range is from 100 to 4294967295.
Specifies the weight change in the queue length in the calculation of
the cpFb which is used to determine the value of the Quantized
Feedback. The weight cpW is equal to two to the power of this value.
Thus, setting the variable to -1, means the cpW is equal to a half. The
valid weight range is from -10 to 10.
Specifies the minimum number of octets to queue in the CP's queue
between transmissions of CNMs. The valid sample base range is from
10000 to 4294967295.
Specifies the minimum number of octets to be returned in a CNM from
the data frame that triggered transmission of the CNM. The valid range
is from 0 to 64.
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