Generated Auto-Qos Configuration - Cisco 2950 - Catalyst Switch Configuration Manual

Configuring Auto-QoS
You use auto-QoS commands to identify ports connected to Cisco IP Phones and to devices running the
Cisco SoftPhone application. You also use the commands to identify ports that receive trusted traffic
through an uplink. Auto-QoS then performs these functions:
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These sections describe how to configure auto-QoS on your switch:
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Generated Auto-QoS Configuration

When auto-QoS is enabled, it uses the ingress packet label to classify traffic and to configure the egress
queues as described in
Table 30-2 Traffic Types, Packet Labels, and Egress Queues
1
VoIP Data
Traffic
DSCP 46
CoS 5
CoS-to-Queue 5
Map
Egress Queue Expedite
(queue 4)
1. VoIP = voice over IP
2. BPDU = bridge protocol data unit
Table 30-3
Table 30-3 Auto-QoS Configuration for the Egress Queues
Egress Queue
Expedite
70% WRR
20% WRR
10% WRR
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
30-10
Detects the presence or absence of IP phones
Configures QoS classification
Configures egress queues
Generated Auto-QoS Configuration, page 30-10
Effects of Auto-QoS on the Configuration, page 30-13
Configuration Guidelines, page 30-13
Upgrading from a Previous Software Release, page 30-14
Enabling Auto-QoS for VoIP, page 30-14
Table 30-2.
VoIP Control Routing Protocol
Traffic Traffic
24, 26 48
3 6
3, 6, 7
70% WRR (queue 3)
lists the generated auto-QoS configuration for the egress queues.
Queue Number
4
3
2
1
2
STP BPDU Real-Time
Traffic Video Traffic
56 34
7 4
4
20% WRR
(queue 2)
CoS-to-Queue Map Queue Weight
5 –
3, 6, 7 70 percent
2, 4 20 percent
0,1 10 percent
Chapter 30 Configuring QoS
All Other Traffic
–
2 0, 1
20% WRR 10% WRR
(queue 2) (queue 1)
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