Auto Qos Voip - Cisco Catalyst 3750 Command Reference Manual
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auto qos voip
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
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, Ingress Packet Labels, Assigned Packet Labels, and Queues
VoIP Data
Traffic
3
Ingress DSCP
46
4
Ingress CoS
5
DiffServ
EF
Assigned DSCP
46
Assigned CoS
5
CoS-to-Ingress
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
Catalyst 3750 Switch Command Reference
2-16
auto qos voip {cisco-phone | trust}
no auto qos voip [cisco-phone | 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 phone is
detected. This keyword is not available 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
Traffic
26
3
AF31
26
3
2, 3, 4, 5, 6, 7 (queue 2)
Chapter 2
Table
Routing Protocol
STP
Traffic
Traffic
–
–
6
7
–
–
48
56
6
7
3, 6, 7 (queue 2)
Catalyst 3750 Switch Cisco IOS Commands
2-1.
1
2
BPDU
All Other Traffic
–
–
–
0
0
0, 1 (queue 1)
2, 4
(queue 3)
0, 1
(queue 4)
78-16181-01
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