Cisco Systems 3560 사용자 설명서

The input mutation causes the DSCP to be rewritten depending on the new value of DSCP chosen. 
The set action in a policy map also causes the DSCP to be rewritten.

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:

Detects the presence or absence of Cisco IP Phones

Configures QoS classification

Configures egress queues

These sections contain this configuration information:

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 

1.

VoIP = voice over IP

 

DSCP

46

24, 26

48

56

34

–

CoS

5

3

6

7

4

–

CoS-to-Ingress 
Queue Map

2, 3, 4, 5, 6, 7 (queue 2)

0, 1 (queue 1)

CoS-to-Egress 
Queue Map

5 (queue 1)

3, 6, 7 (queue 2)

4 (queue 3)

 2 (queue 3)

0, 1 

 

(queue 4)