Avaya Configuring Differentiated Services Manuel d'utilisateur télécharger pdf (Page 21)

Differentiated Services Overview

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• Policy server

The policy server resides inside the ISP or enterprise network. It provides

policy admission control, which administrates network services and user

authentication functions. The policy server monitors which data flows are

assigned to a user and whether an application should have network access. In

addition, the policy server polices data flows so it can limit the amount of

high-priority traffic in the network. This prevents network resources from

becoming overburdened.

In some networks, the bandwidth broker is the same device as the policy

server; however, they can be different devices.

Not all differentiated services networks use a policy server.

• Edge router

The edge router resides at the edge of the network. Its function is to classify

data flows and mark them by setting the DS field in the IP header. The DS

field designates a specific type of service to each packet and instructs the

network how to process the packet.

• Core network device

The core network device, which is typically a high-performance router,

resides in the ISP or enterprise network. It routes data along the appropriate

path through the network. This router cannot classify packets itself.

•Server Manager

The server manager, which resides outside the network, sets up video

conferences. The server manager sometimes acts as the intermediary between

the host and the bandwidth broker, passing on the host’s requests to the

bandwidth broker. The server manager is not a required part of a differentiated

services network.

Figure 1-1

shows a differentiated services network that includes a server manager

and a bandwidth broker. If you manually configure filters, the bandwidth broker

and server manager would not be included.

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Avaya Configuring Differentiated Services Manuel d'utilisateur Page 21