Cisco 3020 - Catalyst Blade Switch Configuration Manual page 540

Configuring Auto-QoS
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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 27-5
Table 27-5 Generated Auto-QoS Configuration
Description
The switch automatically enables standard QoS and configures
the CoS-to-DSCP map (maps CoS values in incoming packets
to a DSCP value).
The switch automatically maps CoS values to an ingress queue
and to a threshold ID.
The switch automatically maps CoS values to an egress queue
and to a threshold ID.
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
27-22
trust the QoS label received in the packet. When a Cisco IP Phone is absent, the ingress classification
is set to not trust the QoS label in the packet. The switch configures ingress and egress queues on
the port according to the settings in
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 27-3 and
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 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
For information about the trusted boundary feature, see the
Ensure Port Security" section on page
to the port.
Table 27-3 and Table
Table 27-4.
27-37.
Automatically Generated Command
Switch(config)# mls qos
Switch(config)# mls qos map cos-dscp 0 8 16 26 32 46
48 56
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
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
Chapter 27
27-4.
Table 27-3 and
"Configuring a Trusted Boundary to
Configuring QoS
Table 27-4.
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