Netgear GS752TXS Technical Information download pdf (Page 299)

Appendix B: Configuration Examples | 299

GS752TXS Smart Switch Software Administration Manual

• Integrated Services: network resources are apportioned based on request and are

reserved (resource reservation) according to network management policy (RSVP, for

example).

• Differentiated Services: network resources are apportioned based on traffic classification

and priority, giving preferential treatment to data with strict timing requirements.

The GS752TXS Smart Switch supports DiffServ.

The DiffServ feature contains a number of conceptual QoS building blocks you can use to

construct a differentiated service network. Use these same blocks in different ways to build

other types of QoS architectures.

There are 3 key QoS building blocks needed to configure DiffServ:

• Class

• Policy

• Service (i.e., the assignment of a policy to a directional interface)

Class

You can classify incoming packets at layers 2, 3, and 4 by inspecting the following

information for a packet:

• Source/destination MAC address

• EtherType

• Class of Service (802.1p priority) value (first/only VLAN tag)

• VLAN ID range (first/only VLAN tag)

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

• Layer 4 protocol (such as TCP or UDP)

• 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 multifield (MF) classifiers:

• Layer 2; Layers 3, 4 (IP only)

• Protocol-based

• Address-based

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Netgear GS752TXS Technical Information Page 299