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Quality of Service guidelines
2. The command to turn on compression is ip rtp header-compression in interface
configuration mode. It must be implemented at both ends of the WAN link. When the
command was entered into the router, ip tcp header-compression was also installed
automatically. When either command was removed, the other was automatically removed.
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:
http://www.avaya.com/support
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
Example 2: C-LANS cannot tag their traffic
Example 3: More restrictions on the traffic
Converged infrastructure LAN switches
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.
In
Figure 85: High-quality service across a congested WAN link
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.
Figure 85: High-quality service across a congested WAN link
reference point. The objective is to assure high quality of service to IP Telephony applications
across the congested WAN link.
328 Avaya Application Solutions IP Telephony Deployment Guide
on page 329, set priority-aware
on page 329 is used as a
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