System Administration Guide: IP Services

QoS Policy Planning (Task Map)

This task map lists the major tasks for planning a QoS policy and links to the instructions to perform each task.



For Instructions 

1. Design your network topology to support IPQoS. 

Identify the hosts and routers on your network to provide differentiated services. 

How to Prepare a Network for IPQoS

2. Define the classes into which services on your network must be divided. 

Examine the types of services and SLAs that are offered by your site, and determine the discrete traffic classes into which these services fall. 

How to Define the Classes for Your QoS Policy

3. Define filters for the classes. 

Determine the best ways of separating traffic of a particular class from the network traffic flow. 

How to Define Filters in the QoS Policy

4. Define flow-control rates for measuring traffic as packets leave the IPQoS system. 

Determine acceptable flow rates for each class of traffic. 

How to Plan Flow Control

5. Define DSCPs or user-priority values to be used in the QoS policy. 

Plan a scheme to determine the forwarding behavior that is assigned to a traffic flow when the flow is handled by the router or switch. 

How to Plan Forwarding Behavior

6. If applicable, set up a statistics-monitoring plan for traffic flows on the network. 

Evaluate the traffic classes to determine which traffic flows must be monitored for accounting or statistical purposes. 

How to Plan for Flow Accounting

Note –

The rest of this section explains how to plan the QoS policy of an IPQoS-enabled system. To plan the QoS policy for the Diffserv router, refer to the router documentation and the router manufacturer's web site.