After packets are assigned to a specific queue, QoS services can be assigned to the queue(s). Output queues are configured with a scheduling scheme by one

of the following methods:

Strict Priority—Ensures that time-sensitive applications are always forwarded via an expedited path. Strict priority allows network administrators to

prioritize mission-critical, time-sensitive traffic over less time-sensitive applications. For example, under strict priority, voice-over-IP traffic is forwarded

before FTP or e-mail (SMTP) traffic. The strict priority queue is emptied before the traffic in the remaining queues is forwarded.

Weighted Round Robin—Ensures that a single application does not dominate the forwarding capacity of PowerConnect 3324/3348. Weighted Round

Robin (WRR) forwards entire queues in a round robin order. Queue priorities are defined by the queue length. The longer the queue length, the higher

the queue's forwarding priority.

For example, if four queues have queue weights of 1, 2, 3 and 4, packets with the highest forwarding priority are assigned to queue 4, and packets with

the lowest forwarding priority are assigned to queue 1. By providing highest forwarding priority to queue 4 , weighted round robin processes higher

priority traffic and ensures that low-priority traffic is forwarded satisfactorily.

The scheduling scheme is enabled system-wide. Queues assigned to the strict priority policy are automatically assigned to the highest priority queue. By

default, all values are set as strict priority. When changing to WRR mode, the default weight value is one. Queue weight values can be assigned in any order

using WRR. WRR values can be assigned on a per-system basis. Best effort traffic is always assigned to the first queue. WRR values must be assigned so that

Queue 1 remains best effort.

Defining QoS Global Parameters

Quality of Service global parameters are set from the QoS Global Parameter pages. To open the QoS Global Parameters page:

Select Quality of Service > Global Parameters in the Tree View. The QoS Global Parameters page opens.

QoS Global Parameters Page

The QoS Global Parameters page contains links for:

Configuring Global QoS Settings

Defining QoS Interface Settings

Defining Queue Settings

Configuring Global QoS Settings

The QoS Global Settings page allows the user to enable or disable QoS. In addition, the user can select the Trust mode. This mode relies on predefined fields

within the packet to determine the output queue, thus determining the service for the packet. To open the QoS Global Settings page:

Select Quality of Service > Global Parameters > Global Settings in the Tree View. The QoS Global Settings page opens.

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