Configuring Auto-Qos - Cisco 3020 - Catalyst Blade Switch Configuration Manual

Configuring Auto-QoS

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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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Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
27-20
During policing, IP and non-IP packets can have another DSCP assigned to them (if they are out of
profile and the policer specifies a markdown DSCP). Once again, the DSCP in the packet is not
modified, but an indication of the marked-down value is carried along. For IP packets, the packet
modification occurs at a later stage; for non-IP packets the DSCP is converted to CoS and used for
queueing and scheduling decisions.
Depending on the QoS label assigned to a frame and the mutation chosen, the DSCP and CoS values
of the frame are rewritten. If you do not configure the mutation map and if you configure the port to
trust the DSCP of the incoming frame, the DSCP value in the frame is not changed, but the CoS is
rewritten according to the DSCP-to-CoS map. If you configure the port to trust the CoS of the
incoming frame and it is an IP packet, the CoS value in the frame is not changed, but the DSCP might
be changed according to the CoS-to-DSCP map.
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.
Detects the presence or absence of Cisco IP Phones
Configures QoS classification
Configures egress queues
Generated Auto-QoS Configuration, page 27-21
Effects of Auto-QoS on the Configuration, page 27-25
Auto-QoS Configuration Guidelines, page 27-25
Enabling Auto-QoS for VoIP, page 27-26
Auto-QoS Configuration Example, page 27-27
Chapter 27 Configuring QoS
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