D-Link DGS-1016D, DGS-1024D manual Understanding QoS, Mapping QoS on the Switch

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which packets from various applications are mapped to and assigned a priority. The illustration below shows how 802.1P priority queuing is implemented on the Switch. The eight IEEE 802.1P priority levels defined by the standard are mapped to the four class queues used in the Switch.

Mapping QoS on the Switch

The picture above shows the default priority setting for the Switch. Class-3 has the highest priority of the four priority queues on the Switch. In order to implement QoS, the user is required to instruct the Switch to examine the header of a packet to see if it has the proper identifying tag tagged. Then the user may forward these tagged packets to designated queues on the Switch where they will be emptied, based on priority.

"The DUT support strict mode for 802.1p QoS. The untagged pkt will follow the priority 0 to work (i.e. class 1)."

Understanding QoS

The Switch has four priority queues. These priority queues are labeled as 3, the high queue to 0, the lowest queue. The eight priority tags, specified in IEEE 802.1p are mapped to the Switch's priority tags as follows:

Priority 0 is assigned to the Switch's Q1 queue.

Priority 1 is assigned to the Switch's Q0 queue.

Priority 2 is assigned to the Switch's Q0 queue.

Priority 3 is assigned to the Switch's Q1 queue.

Priority 4 is assigned to the Switch's Q2 queue.

Priority 5 is assigned to the Switch's Q2 queue.

Priority 6 is assigned to the Switch's Q3 queue. 13

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Contents Manual 16/24-Port 10/100/1000Mbps Gigabit Ethernet SwitchLink DGS-1016D/DGS-1024D Unmanaged Gigabit Ethernet Switch Contents Preface Safety Cautions Safety InstructionsPage General Precautions for Rack Mountable Products Safety Instructions Protecting Against Electrostatic Discharge Section Switch DescriptionSwitch Features 802.1P and QoS Gigabit Ethernet TechnologyAdvantages of QoS Understanding QoS Mapping QoS on the SwitchPage Front Panel View of the Switch LED IndicatorsLED Indicators Front-Panel ComponentsCable Diagnostic Cable Diagnostic LED Indicator Description PowerLink/Act 100Mbps/1000MbpsRear panel view of the Switch Power Input on Rear PanelPackage Contents InstallationBefore You Connect to the Network Mounting the Switch to a Rack Mounting the Switch on a RackProvide for Adequate Ventilation Attaching the Rubber FeetAttaching the Rubber Feet Power Failure Power OnCable Quality SectionSwitch connected to an end node Switch to End NodeConnect to another switch or hub Switch to Hub or SwitchConnection to a Server Connecting to Network Backbone or ServerGeneral AppendixPhysical and Environmental Performance Glossary Line speed See baud rate Page USA Warranty and Registration Information Page Page Page Page Page Belgium Spain International OfficesHungary