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Quality of Service guidelines
332 Avaya Application Solutions IP Telephony Deployment Guide
 
See the Cisco documentation for more specific configurations on other types of WAN links (that 
is, Frame Relay and ATM). Configuration for the X330WAN router is very similar to Cisco, and is 
well documented in the X330WAN User Guides. For this documentation, see the P330 section 
at:
Examples of QoS implementation
This section contains sample commands for QoS implementation on Avaya products and Cisco 
products. 
Examples given include:
Example 1: Cisco router configuration for point-to-point WAN 
links
There is a three-step process to turn on QoS on a Cisco router:
1. Set up a class map that defines “interesting traffic” to be prioritized.
2. Select a queuing strategy. In this case, use a policy map to set priority. Set up a route map 
that sets the priority level (critical).
3. Apply the policy map to an interface.
Class-Based Weighted Fair Queuing (CB-WFQ) with Low Latency Queuing (LLQ). Although 
there are more aggressive QoS strategies, they can have a severe impact on data performance. 
Those other strategies, including Priority Queuing, Custom Queuing, and RSVP, can be 
implemented at a later date, if conditions warrant. This is a good starting point.
on page 333 is used as a 
reference point. The objective is to assure high quality of service to IP Telephony applications 
across the congested WAN link.