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Diffserv overview – NETGEAR MS510TXPP 8 Port Gigabit PoE Managed Switch User Manual

Page 198

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Smart Managed Pro Switches MS510TX and MS510TXPP

Configure Quality of Service

User Manual

198

Standard IP-based networks are designed to provide best effort data delivery service. Best
effort service implies that the network attempts to deliver the data in a timely fashion. During
times of congestion, packets might be delayed, sent sporadically, or dropped. For typical
Internet applications, such as email and file transfer, a slight degradation in service is
acceptable and in many cases unnoticeable. Conversely, any degradation of service can
negatively affect applications with strict timing requirements, such as voice or multimedia.

From the

QoS > Diffserv > Advanced

menu, you can access pages that are described in the

following sections:

DiffServ Overview on page

198

View the Global DiffServ Resources on page

199

Specify DSCP Remark Values for Violate Action IP Packets on page

199

Configure IPv4 DiffServ Classes on page

201

Configure an IPv6 DiffServ IPv6 Classes on page

205

Configure a DiffServ Policy on page

209

Configure DiffServ Service Interfaces on page

214

View DiffServ Service Statistics on page

215

DiffServ Overview

To use DiffServ for QoS, you must first define the following categories and their criteria:

1. Class

. Create classes and define class criteria.

2. Policy

. Create policies, associate classes with policies, and define policy statements.

3. Service

. Add a policy to an inbound interface.

Packets are classified and processed based on defined criteria. The classification criteria are
defined by a class. The processing is defined by a policy’s attributes. Policy attributes can be
defined on a per-class instance basis, and it is these attributes that are applied when a match
occurs. A policy can contain multiples classes. When the policy is active, the actions taken
depend on which class matches the packet.

The configuration process begins with defining one or more match criteria for a class. Then
one or more classes are added to a policy. Policies are then added to interfaces.

Packet processing begins by testing the class match criteria for a packet.

The

All

class type option specifies that each match criteria within a class must evaluate to

true for a packet to match that class. Classes are tested in the order in which they were
added to the policy.

A policy is applied to a packet when a class match within that policy is found.