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Quality of Service guidelines
Administration commands for Example 3
Table 79: Administration commands for Example 3
Command
1.access-list 101 permit
ip 192.168.1.0
0.0.0.255
192.168.2.0 0.0.0.255
dscp 46
2.access-list 101 permit
ip 192.168.2.0
0.0.0.255 192.168.1.0
0.0.0.255 dscp 46
3.class-map match-any
VoIP
4.match access-group 101
5.policy-map voipQoS
6.class VoIP priority
768
7.class class-default
fair-queue
8.random-detect
dscp-based
9.interface Serial0
description T1 ip
address 172.16.0.1
service-policy output
voipQoS
If any of the endpoints are incapable of tagging, the "dscp 46" can be removed from access list
101. Then any traffic between the two IP Telephony subnetworks, regardless of the tag, is in the
class "VoIP."
332 Avaya Application Solutions IP Telephony Deployment Guide
Meaning
Left router
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
Create a class map called "VoIP."
Only packets matching access list 101 are in
the class VoIP; this is more restrictive than
matching any packet with DSCP 46 or 34.
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.
If the default queue starts to get full,
randomly discard packets in this queue
based on DSCP (lower values get discarded
first).
Apply the "voipQoS" policy outbound on this
interface.
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