Netgear GS724TS-100NAS User Manual download pdf (Page 256)

256 | Appendix B: Configuration Examples

GS716Tv2 and GS724Tv3 Software Administration Manual

• IP Service Type octet (also known as: ToS bits, Precedence value, DSCP value)

• Layer 4 protocol (TCP, UDP etc.)

• Layer 4 source/destination ports

• Source/destination IP address

From a DiffServ point of view, there are two types of classes:

• DiffServ traffic classes

• DiffServ service levels/forwarding classes

DiffServ Traffic Classes

With DiffServ, you define which traffic classes to track on an ingress interface. You can define

simple BA classifiers (DSCP) and a wide variety of multi-field (MF) classifiers:

• Layer 2; Layers 3, 4 (IP only)

• Protocol-based

• Address-based

You can combine these classifiers with logical AND or OR operations to build complex

MF-classifiers (by specifying a class type of all or any, respectively). That is, within a single

class, multiple match criteria are grouped together as an AND expression or a sequential OR

expression, depending on the defined class type. Only classes of the same type can be

nested; class nesting does not allow for the negation (i.e., exclude option) of the referenced

class.

To configure DiffServ, you must define service levels, namely the forwarding classes/PHBs

identified by a given DSCP value, on the egress interface. These service levels are defined

by configuring BA classes for each.

Creating Policies

Use DiffServ policies to associate a collection of classes that you configure with one or more

QoS policy statements. The result of this association is referred to as a policy.

From a DiffServ perspective, there are two types of policies:

• Traffic Conditioning Policy: a policy applied to a DiffServ traffic class

• Service Provisioning Policy: a policy applied to a DiffServ service level

You must manually configure the various statements and rules used in the traffic conditioning

and service provisioning policies to achieve the desired Traffic Conditioning Specification

(TCS) and the Service Level Specification (SLS) operation, respectively.

Traffic Conditioning Policy

Traffic conditioning pertains to actions performed on incoming traffic. There are several

distinct QoS actions associated with traffic conditioning:

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Netgear GS724TS-100NAS User Manual Page 256