Configuring Auto-Qos; Generated Auto-Qos Configuration - Cisco IE-3000-8TC Software Configuration Manual

Chapter 36 Configuring QoS

Configuring Auto-QoS

You can use the auto-QoS feature to simplify the deployment of existing QoS features. Auto-QoS makes
assumptions about the network design, and as a result, the switch can prioritize different traffic flows
and appropriately use the ingress and egress queues instead of using the default QoS behavior. (The
default is that QoS is disabled. The switch then offers best-effort service to each packet, regardless of
the packet contents or size, and sends it from a single queue.)
When you enable auto-QoS, it automatically classifies traffic based on the traffic type and ingress packet
label. The switch uses the resulting classification to choose the appropriate egress queue.
You use auto-QoS commands to identify ports connected to Cisco IP Phones and to devices running the
Cisco SoftPhone application. You also use the commands to identify ports that receive trusted traffic
through an uplink. Auto-QoS then performs these functions:
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These sections contain this configuration information:
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Generated Auto-QoS Configuration

By default, auto-QoS is disabled on all ports.
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 36-2 Traffic Types, Packet Labels, and Queues
1
VoIP
Traffic
DSCP 46
CoS 5
CoS-to-Ingress 2, 3, 4, 5, 6, 7 (queue 2)
Queue Map
CoS-to-Egress 5 (queue 1)
Queue Map
1. VoIP = voice over IP
OL-13018-03
Detects the presence or absence of Cisco IP Phones
Configures QoS classification
Configures egress queues
Generated Auto-QoS Configuration, page 36-19
Effects of Auto-QoS on the Configuration, page 36-24
Auto-QoS Configuration Guidelines, page 36-24
Enabling Auto-QoS for VoIP, page 36-25
Auto-QoS Configuration Example, page 36-26
Data VoIP Control Routing Protocol
Traffic Traffic
24, 26 48
3 6
3, 6, 7 (queue 2)
Table 36-2.
STP BPDU Real-Time
Traffic Video Traffic
56 34
7 4
4 (queue 3)
Cisco IE 3000 Switch Software Configuration Guide
Configuring Auto-QoS
All Other Traffic
–
–
0, 1 (queue 1)
2 (queue 3) 0, 1
(queue 4)
36-19