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Catalyst 3750 Switch Command Reference
OL-8552-07
Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
auto qos voip
auto qos voip
Use the auto qos voip interface configuration command to automatically configure quality of service
(QoS) for voice over IP (VoIP) within a QoS domain. Use the no form of this command to return to the
default setting.
auto qos voip {cisco-phone | cisco-softphone | trust}
no auto qos voip [cisco-phone | cisco-softphone | trust]
Syntax Description
Defaults Auto-QoS is disabled on the port.
When auto-QoS is enabled, it uses the ingress packet label to categorize traffic, to assign packet labels,
and to configure the ingress and egress queues as shown in
Table 2-1.
cisco-phone Identify this port as connected to a Cisco IP Phone, and automatically configure QoS
for VoIP. The QoS labels of incoming packets are trusted only when the telephone
is detected. This keyword is not supported on a 10-Gigabit Ethernet interface.
cisco-softphone Identify this port as connected to a device running the Cisco SoftPhone, and
automatically configure QoS for VoIP. This keyword is not supported on a
10-Gigabit Ethernet interface.
trust Identify this port as connected to a trusted switch or router, and automatically
configure QoS for VoIP. The QoS labels of incoming packets are trusted. For
nonrouted ports, the CoS value of the incoming packet is trusted. For routed ports,
the DSCP value of the incoming packet is trusted.
Ta b l e 2-1 Traffic Types, Packet Labels, and Queues
VoIP Data
Traffic
VoIP Control
Traffic
Routing Protocol
Traffic
STP
1
BPDU
2
Traffic
1. STP = Spanning Tree Protocol
2. BPDU = bridge protocol data unit
Real-Time
Video Traffic All Other Traffic
DSCP
3
3. DSCP = Differentiated Services Code Point
46 24, 26 48 56 34 –
CoS
4
4. CoS = class of service
5 3 6 7 3 –
CoS-to-ingress
queue map
2, 3, 4, 5, 6, 7 (queue 2) 0, 1 (queue 1)
CoS-to-egress
queue map
5 (queue 1) 3, 6, 7 (queue 2) 4 (queue 3) 2
(queue 3)
0, 1
(queue 4)
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