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Differentiated Services Overview

308620-14.00 Rev 00

1-7

Figure 1-3. Nortel Networks Differentiated Services Architecture

DFS0005A

Bandwidth broker/policy server

Inbound

data

Classification,

policing, and

marking

mechanism

COPS

client

COPS client

communicates with the

bandwidth broker

TCP

connection

Differentiated services

application

High

queue

Medium

queue

Protocol

prioritization

by mark in

DS field

Low

queue

Flows with the

DS field marked go to

protocol prioritization

1. Router receives data.

2. There is a trigger filter match and the differentiated services application is notified.

3. Router sends message to bandwidth broker, which includes the trigger filter ID

and part of the original data packet.

4. Bandwidth broker associates traffic with a level of service. The dataflow

passes policy admission control.

5. Bandwidth broker associates the level of service with bandwidth resources.

The dataflow passes bandwidth admission control.

6. The bandwidth broker installs a flow filter on the router.

4/5

(best effort)

Unmarked

flows

Tiered

marked

flows

Premium

marked

flows

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