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Differentiated Services Overview

308620-14.00 Rev 00

1-5

If an interface on the router becomes inactive or terminates, the differentiated

services application deletes all filters from that interface. After the interface

recovers, the router needs to request the filters from the bandwidth broker again. If

the connection to the bandwidth broker is temporarily lost, the COPS client

software attempts to reconnect to the server. In this case, the router does not delete

the filters.

The bandwidth broker assigns an ID to each filter before installing it on the router.

The bandwidth broker can then change an installed filter based on that ID. If the

bandwidth broker requests an update or removal of a nonexistent filter, the router

ignores the request and sends an error message to the bandwidth broker. You can

view the filters installed by the bandwidth broker using the router’s traffic filters

feature, but you cannot modify them.

Figure 1-2

shows the Nortel Networks bandwidth broker architecture.

Figure 1-2. Architecture of the Bandwidth Broker

DFS0004A

Server manager

Policy server/COPS server GUI

Application server

Web server

LDAP

Policy information

is placed in

the database

LDAP server

with policy

database

Bandwidth broker PC using

Windows NT

TCP connection

to the router

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Avaya Configuring Differentiated Services Manual de usuario Pagina 23