Avaya Configuring Differentiated Services Uživatelský manuál stáhnout pdf (Strana 19)

308620-14.00 Rev 00

1-1

Chapter 1

Differentiated Services Overview

Differentiated services is a network architecture that lets service providers and

enterprise network environments offer varied levels of service for different types

of data traffic. Instead of using the “best-effort” service model to ensure data

delivery, differentiated services lets you designate a specific level of performance

on a packet-by-packet basis. If you have applications that require high

performance and reliable service, such as voice and video over IP, you can use

differentiated services to give preferential treatment to this data over other traffic.

For each packet, there is a differentiated services field in the packet header that

you can mark for specific service. For IP packets, this is called the DS field. The

DS field has a specific value that defines how the packet is treated as it travels

through the network.

Differentiated services is scalable, making it ideal for large networks. Edge

devices, like Nortel Networks routers, classify much of the data, leaving less of

the processing for the core of the network. In addition, the services can aggregate

traffic for more efficient transmission.

Implementing Differentiated Services

In any differentiated services network, the edge router is responsible for filtering

and marking data packets for service; however, there are two different methods for

configuring filters on the edge router.

You can install filters using one of two methods:

• Dynamically install them by a server called the bandwidth broker, which

communicates with the router using the Common Open Policy Server (COPS)

protocol. Trigger and flow filters are then automatically installed on the

router.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 85 86

Žádné komentáře

Avaya Configuring Differentiated Services Uživatelský manuál Strana 19