Auto Qos Voip - Cisco Catalyst 3750 Command Reference Manual

Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

auto qos voip

Use the auto qos voip interface configuration command on the switch stack or on a standalone switch
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.
Syntax Description
cisco-phone
cisco-softphone Identify this port as connected to a device running the Cisco SoftPhone, and
trust
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 Traffic Types, Packet Labels, and Queues
VoIP Data
Traffic
3
DSCP 46
4
CoS 5
CoS-to-Ingress 2, 3, 4, 5, 6, 7 (queue 2)
Queue Map
CoS-to-Egress 5 (queue 1)
Queue Map
1. STP = Spanning Tree Protocol
2. BPDU = bridge protocol data unit
3. DSCP = Differentiated Services Code Point
4. CoS = class of service
78-16181-03
auto qos voip {cisco-phone | cisco-softphone | trust}
no auto qos voip [cisco-phone | cisco-softphone | trust]
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.
automatically configure QoS for VoIP. This keyword is not supported on a
10-Gigabit Ethernet interface.
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.
VoIP Control Routing Protocol
Traffic Traffic
24, 26 48
3 6
3, 6, 7 (queue 2)
Table 2-1.
1 2
STP BPDU Real-Time
Traffic Video Traffic
56 34
7 3
4 (queue 3)
Catalyst 3750 Switch Command Reference
auto qos voip
All Other Traffic
–
–
0, 1 (queue 1)
2 0, 1
(queue 3) (queue 4)
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