Draytek Vigor 2950Gi User's Guide download pdf (Page 111)

igor2930 Series User’s Guide

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In a QoS-enabled network, or Differentiated Service (DiffServ or DS) framework, a DS

domain owner should sign a Service License Agreement (SLA) with other DS domain

owners to define the service level provided toward traffic from different domains. Then each

DS node in these domains will perform the priority treatment. This is called

per-hop-behavior (PHB). The definition of PHB includes Expedited Forwarding (EF),

Assured Forwarding (AF), and Best Effort (BE). AF defines the four classes of delivery (or

forwarding) classes and three levels of drop precedence in each class.

Vigor routers as edge routers of DS domain shall check the marked DSCP value in the IP

header of bypassing traffic, thus to allocate certain amount of resource execute appropriate

policing, classification or scheduling. The core routers in the backbone will do the same

checking before executing treatments in order to ensure service-level consistency throughout

the whole QoS-enabled network.

However, each node may take different attitude toward packets with high priority marking

since it may bind with the business deal of SLA among different DS domain owners. It’s not

easy to achieve deterministic and consistent high-priority QoS traffic throughout the whole

network with merely Vigor router’s effort.

In the Bandwidth Management menu, click Quality of Service to open the web page.

This page displays the QoS settings result of the WAN interface. Click the Setup link to

access into next page for the general setup of WAN (1/2) interface. As to class rule, simply

click the Edit link to access into next for configuration.

You can configure general setup for the WAN interface, edit the Class Rule, and edit the

Service Type for the Class Rule for your request.

When you click Setup, you can configure the bandwidth ratio for QoS of the WAN interface.

There are four queues allowed for QoS control. The first three (Class 1 to Class 3) class rules

can be adjusted for your necessity. Yet, the last one is reserved for the packets which are not

suitable for the user-defined class rules.

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Draytek Vigor 2950Gi User's Guide Page 111