D-Link DXS-3600-EM-8XS CLI Guide - Page 500

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 nonoptimality 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. Example This example shows how to configure the Congestion Point for interface Gi1.1. 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 (Optional) Specifies to display the total discarded frames, auto alternate priority and error portlist for the CNPV. Default Command Mode Command Default Level Usage Guideline 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. 492