Quality of Service guidelines

Example 3: More restrictions on the traffic

Assumptions for Example 3

DSCP 46 is used throughout to simplify the access list.

A somewhat matching set of configurations is applied to both routers.

Administration commands for Example 3

Table 60: Administration commands for Example 3

Command

 

 

Meaning

 

 

1.access-list 101 permit

Left router

ip 192.168.1.0

 

0.0.0.255

 

 

 

192.168.2.0

0.0.0.255

 

dscp 46

 

 

 

 

 

2.access-list 101 permit

Right router

ip 192.168.2.0

The “access list 101...” permits any IP traffic

0.0.0.255

192.168.1.0

that is tagged with DSCP 46 between the two

VoIP subnets. There is an implicit deny any at

0.0.0.255 dscp 46

the end of this access list

 

 

 

 

 

3.class-map match-any

Create a class map called “VoIP.”

VoIP

 

 

 

 

 

4.match access-group 101

Only packets matching access list 101 are in

 

 

 

the class VoIP; this is more restrictive than

 

 

 

matching any packet with DSCP 46 or 34.

 

 

 

 

5.policy-map voipQoS

6.class VoIP priority 768

7.class class-default fair-queue

Create a class map called “VoIP.”

Give strict priority to packets in the class “VoIP” on up to 768k of this WAN link.

Put everything else in the default class and transmit it out the default queue in a fair queue fashion.

336 Avaya Application Solutions IP Telephony Deployment Guide

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Avaya 555-245-600 manual Example 3 More restrictions on the traffic