D-Link DGS-6608 — руководство по настройке механизма пакетного планирования QoS [590/1106]

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DGS-6600 Series Switch m qos deficit-round-robin

CLI Reference Guide

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qos deficit-round-robin

Use the qos command in interface configuration mode to enable the Deficit

Round Robin (DRR)/Weighted Round Robin (WRR) packet scheduling

mechanism. To restore the packet scheduling mechanism, use the default form

of this command.

qos {deficit-round-robin [COS-QUEUE quantum WEIGHT] |weight-round-robin [COS-QUEUE

weight WEIGHT]}

default qos

Default Strict priority mode.

quantum WEIGHT: 1

wrr-WEIGHT: 1

Command Mode Interface configuration.

Usage Guideline Only physical port interfaces are valid for this command.

The port CoS queue can be either strict priority mode, deficit round robin (DRR)

mode or Weight round robin (WRR) mode. The strict priority scheduler mode

provides strict priority access to the egress port across the transmit priority

queue from the highest priority index to the lowest. The purpose of the strict

priority scheduler is to provide lower latency service to the higher CoS classes of

traffic.

DRR operates by serving a mount of backlogged credits into the transmit queue

in round robin order. Initially, each queue sets its credit counter to a configurable

quantum value. Every time a packet from a CoS queue is sent, the size of the

packet is subtracted from the corresponding credit counter. When the credit

counter drops below 0, the queue is no longer serviced until its credits are

replenished.

All queues are serviced until their credit counter is zero or negative and a packet

is transmitted completely. As this condition happens, the credits are replenished.

When the credits are replenished, as a quantum of credits are added to each

Syntax Description

deficit-round-robin deficit-round-robin in interface configuration mode to enable the Deficit Round

Robin (DRR) packet scheduling mechanism

weight-round-robin weight-round-robin in interface configuration mode to enable the weighted

Round Robin (WRR) packet scheduling mechanism

COS-QUEUE The transmit priority queue; valid value is from 0 to 7.

quantum WEIGHT (Optional) Specifies the Deficit Round Robin (DRR) quantum weight value is

project dependent. The number of zero stands for strict priority mode.

weight WEIGHT (Optional) Specifies the WRR weight. The final weight is number of permitted

scheduling packets.The number of zero stands for strict priority mode.