Netgear XS748T-100NES User Manual

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Configuration Examples

358

ProSAFE 10-Gigabit Smart Managed Switch XS728T and XS748T User Manual

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

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

other types of QoS architectures.

You must configure three key QoS building blocks for DiffServ:

• Class

• Policy

• Service (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 (TCP, UDP and so on)

• Layer 4 source/destination ports

• Source/destination IP address

From a DiffServ point of view, two types of classes exist:

• 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

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 (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. You define these service levels by

configuring BA classes for each.

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Netgear ‎XS748T-100NES - 48-Port 10G Ethernet Smart Switch