33-22
Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 33 Configuring QoS
Configuring Auto-QoS
• When you enter the auto qos voip cisco-softphone interface configuration command on a port at
the edge of the network that is connected to a device running the Cisco SoftPhone, the switch uses
policing to determine whether a packet is in or out of profile and to specify the action on the packet.
If the packet does not have a DSCP value of 24, 26, or 46 or is out of profile, the switch changes the
DSCP value to 0. The switch configures ingress and egress queues on the port according to the
settings in Table 33-3 and Table 33-4.
• When you enter the auto qos voip trust interface configuration command on a port connected to the
interior of the network, the switch trusts the CoS value for nonrouted ports or the DSCP value for
routed ports in ingress packets (the assumption is that traffic has already been classified by other
edge devices). The switch configures the ingress and egress queues on the port according to the
settings in Table 33-3 and Table 33-4.
For information about the trusted boundary feature, see the “Configuring a Trusted Boundary to
Ensure Port Security” section on page 33-39.
When you enable auto-QoS by using the auto qos voip cisco-phone, the auto qos voip cisco-softphone,
or the auto qos voip trust interface configuration command, the switch automatically generates a QoS
configuration based on the traffic type and ingress packet label and applies the commands listed in
Table 33-5 to the port.
Table 33-5 Generated Auto-QoS Configuration
Description Automatically Generated Command
The switch automatically enables standard QoS and configures
the CoS-to-DSCP map (maps CoS values in incoming packets
to a DSCP value).
Switch(config)# mls qos
Switch(config)# mls qos map cos-dscp 0 8 16 26 32 46
48 56
The switch automatically maps CoS values to an ingress queue
and to a threshold ID.
Switch(config)# no mls qos srr-queue input cos-map
Switch(config)# mls qos srr-queue input cos-map
queue 1 threshold 3 0
Switch(config)# mls qos srr-queue input cos-map
queue 1 threshold 2 1
Switch(config)# mls qos srr-queue input cos-map
queue 2 threshold 1 2
Switch(config)# mls qos srr-queue input cos-map
queue 2 threshold 2 4 6 7
Switch(config)# mls qos srr-queue input cos-map
queue 2 threshold 3 3 5
The switch automatically maps CoS values to an egress queue
and to a threshold ID.
Switch(config)# no mls qos srr-queue output cos-map
Switch(config)# mls qos srr-queue output cos-map
queue 1 threshold 3 5
Switch(config)# mls qos srr-queue output cos-map
queue 2 threshold 3 3 6 7
Switch(config)# mls qos srr-queue output cos-map
queue 3 threshold 3 2 4
Switch(config)# mls qos srr-queue output cos-map
queue 4 threshold 2 1
Switch(config)# mls qos srr-queue output cos-map
queue 4 threshold 3 0
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