Specifications

27-20

Catalyst 2970 Switch Software Configuration Guide

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Chapter 27 Configuring QoS

Configuring Auto-QoS

• 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 interfaces 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 interface according to the settings in Table 27-3 and

Table 27-4.

For information about the trusted boundary feature, see the “Configuring a Trusted Boundary to

Ensure Port Security” section on page 27-34.

When you enable auto-QoS by using the auto qos voip cisco-phone 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 27-5 to the interface.

Table 27-5 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