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Quality of Service guidelines
336 Avaya Application Solutions IP Telephony Deployment Guide
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
ip 192.168.1.0
0.0.0.255
192.168.2.0 0.0.0.255
dscp 46
Left router
2.access-list 101 permit
ip 192.168.2.0
0.0.0.255 192.168.1.0
0.0.0.255 dscp 46
Right router
The “access list 101...” permits any IP traffic
that is tagged with DSCP 46 between the two
VoIP subnets. There is an implicit deny any at
the end of this access list
3.class-map match-any
VoIP
Create a class map called “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 Create a class map called “VoIP.”
6.class VoIP priority
768
Give strict priority to packets in the class
“VoIP” on up to 768k of this WAN link.
7.class class-default
fair-queue
Put everything else in the default class and
transmit it out the default queue in a fair
queue fashion.