Auto Qos Voip - Cisco Catalyst 2950 Command Reference Manual

Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

auto qos voip

Use the auto qos voip interface configuration command to configure automatic quality of service
(auto-QoS) for voice over IP (VoIP) within a QoS domain. Use the no form of this command to change
the auto-QoS configuration settings to the standard-QoS defaults.
This command is available only if your switch is running the enhanced software image (EI).
Syntax Description
cisco-phone
cisco-softphone
trust
Defaults Auto-QoS is disabled on all interfaces.
When auto-QoS is enabled, it uses the ingress packet label to categorize traffic and to configure the
egress queues as summarized in
Table 2-1 Traffic Types, Packet Labels, and Egress Queues
VoIP Data
Traffic
3
DSCP 46
CoS 5
CoS-to-Queue 5
Map
Egress Queue 1% WRR
(queue 4)
1. STP = Spanning Tree Protocol
2. BPDU = bridge protocol data unit
3. DSCP = Differentiated Services Code Point
4. WRR = weighted round robin
Table 2-2
OL-10102-01
auto qos voip {cisco-phone | cisco-softphone | trust}
no auto qos voip
Identify this interface as connected to a Cisco IP phone, and automatically
configure QoS for VoIP. The QoS labels of incoming packets are trusted
only when the phone is detected.
Identify this port as connected to a device running the Cisco SoftPhone, and
automatically configure QoS for VoIP.
Identify this interface as connected to a trusted switch or router. The QoS
labels of incoming packets are trusted.
VoIP Control Routing Protocol
Traffic Traffic
24, 26 48
3 6
3, 6, 7
4
70% WRR (queue 3)
lists the auto-QoS configuration for the egress queues.
Table 2-1.
1 2
STP BPDU
Traffic
56
7
Catalyst 2950 and Catalyst 2955 Switch Command Reference
Real-Time
Video Traffic All Other Traffic
34 —
4 —
4 2
20% WRR 20% WRR
(queue 2) (queue 2)
auto qos voip
0, 1
10% WRR
(queue 1)
2-17