Allied Telesis management software layer 2+ fast ethernet switches manual Policy 11 Commands

Chapter 20: Quality of Service (QoS) Commands

QoS Command Sequence Examples

Creating a QoS policy involves a command sequence that creates one or more classifiers, a flow group, a traffic class, and finally the policy. The following sections contain examples of the command sequences for different types of policies.

Example 1: Voice Application

Voice applications typically require a small bandwidth but it must be consistent. They are sensitive to latency (interpacket delay) and jitter (delivery delay). Voice applications can be set up to have the highest priority.

This example creates two policies that ensure low latency for all traffic sent by and destined to a voice application located on a node with the IP address 149.44.44.44. The policies raise the priority level of the packets to 7, the highest level. Policy 6 is for traffic from the application that enter the switch on port 1. Policy 11 is for traffic arriving on port 8 going to the application.

Policy 6 Commands:

create classifier=22 description=”VoIP flow” ipsadddr=149.44.44.44

create qos flowgroup=14 description=”VoIP flow” priority=7 classifierlist=22

create qos trafficclass=18 description=”VoIP flow” flowgrouplist=14

create qos policy=6 description=”VoIP flow” trafficclasslist=18 ingressport=1

Policy 11 Commands:

create classifier=23 description=”VoIP flow” ipdadddr=149.44.44.44

create qos flowgroup=17 description=”VoIP flow” priority=7 classifierlist=23

create qos trafficclass=15 description=”VoIP flow” flowgrouplist=17

create qos policy=11 description=”VoIP flow” trafficclasslist=15 ingressport=8

The parts of the policies are:

❑Classifiers - Define the traffic flow by specifying the IP address of the node with the voice application. The classifier for Policy 6 specifies the address as a source address since this classifier is part

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