D-Link DXS-3600-16S Manual page 500

Usage Guideline
Example
DXS-3600-32S#configure terminal
DXS-3600-32S(config)# interface Gi1.1
DXS-3600-32S(config-if)# qcn cp 1 set-point 30000
DXS-3600-32S(config-if)# qcn cp 1 weight 1
DXS-3600-32S(config-if)# qcn cp 1 sample-base 160000
DXS-3600-32S(config-if)# qcn cp 1 min-header-octets 10
DXS-3600-32S(config-if)#
49-7 show qcn cnpv
This command is used to display the QCN CNPV settings and status.
show qcn cnpv [status]
Parameters
status
Default
Command Mode
Command Default Level
Usage Guideline
DXS-3600 Series 10GbE Layer 2/3 Switch CLI Reference Guide
The command is available for physical port configuration. The Congestion Point (CP)
Index is decided by IEEE 802.1p priority remapping procedure. Each priority
transforms to the traffic class after priority remapping. The transformed traffic class is
the Congestion Point (CP) Index. This means that multiple priority values could be
mapped to the same traffic class and uses the same Congestion Point (CP) to detect
traffic congestion. The CP index is obtained by priority remapping procedure, it might
cause some CP index is never used. If the user configures the unused CP, a warning
message will be prompted.
You can use this command to configure 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 Congestion
Notification Message and indicates the degree of congestion. In other words, 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).
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, cpFb will be closer to 0 than if the queue length is moving away from
cpQSp.
Use the command to configure the Congestion Point (CP) settings in interface
configuration mode. The command only takes effect when the QCN is enabled
globally.
This example shows how to configure the Congestion Point for interface Gi1.1.
(Optional) Specifies to display the total discarded frames, auto alternate priority and
error portlist for the CNPV.
None.
EXEC Mode.
Level: 3.
Use this command to display the configured QCN CNPV configuration. Use this
command with the status keyword to display the total discarded frames, auto
alternate priority and error portlist.
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