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646 Dell PowerConnect 55xx Systems User Guide

Configuring QoS Properties Using CLI Commands

The following table summarizes the CLI commands for configuring fields in

the QoS Properties: Summary page.

The following is an example of the CLI command:

Queue

The switch supports eight queues for each interface. Queue number eight is

the highest priority queue. Queue number one is the lowest priority queue.

Traffic Limitation Methods

There are two ways of determining how traffic in queues is handled, Strict

Priority and Weighted Round Robin (WRR):

•

Strict Priority

— Egress traffic from the highest-priority queue is

transmitted first. Traffic from the lower queues is processed only after the

highest queue has been transmitted, thus providing the highest level of

priority of traffic to the lowest-numbered queue.

•

Weighted Round Robin (WRR)

— In WRR mode, the number of packets

sent from the queue is proportional to the weight of the queue (the higher

the weight, the more frames are sent). For example, if all eight queues are

WRR and the default weights are used, queue 1 receives 1/15 of the

bandwidth (assuming all queues are saturated and there is congestion),

queue 2 receives 2/15, queue 3 receives 4/15, and queue 8 receives 8/15 of

the bandwidth. The type of WRR algorithm used in the device is not the

standard Deficit WRR (DWRR), but rather Shaped Deficit WRR

(SDWRR).

Table 22-2. QoS Properties CLI Commands

CLI Command Description

qos cos default-cos

no qos cos

Defines the default CoS value of a port.

Use the no form of this command to restore the

default configuration.

console(config)# interface gi1/0/15

console(config-if)# qos cos 3

1 2 ... 641 642 643 644 645 646 647 648 649 650 651 ... 727 728

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