37-36
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-08
Chapter 37 Configuring QoS
Configuring Standard QoS
To display information about the QoS configuration that might be affected by auto-QoS, use one of these
commands:
• show mls qos
• show mls qos maps cos-dscp
• show mls qos interface [interface-id] [buffers | queueing]
• show mls qos maps [cos-dscp | cos-input-q | cos-output-q | dscp-cos | dscp-input-q |
dscp-output-q]
• show mls qos input-queue
• show running-config
For more information about these commands, see the command reference for this release.
Configuring Standard QoS
Before configuring standard QoS, you must have a thorough understanding of these items:
• The types of applications used and the traffic patterns on your network.
• Traffic characteristics and needs of your network. Is the traffic bursty? Do you need to reserve
bandwidth for voice and video streams?
• Bandwidth requirements and speed of the network.
• Location of congestion points in the network.
These sections contain this configuration information:
• Default Standard QoS Configuration, page 37-36
• Standard QoS Configuration Guidelines, page 37-39
• Enabling QoS Globally, page 37-41 (required)
• Enabling VLAN-Based QoS on Physical Ports, page 37-42 (optional)
• Configuring Classification Using Port Trust States, page 37-43 (required
• Configuring a QoS Policy, page 37-49 (required)
• Configuring DSCP Maps, page 37-74 (optional, unless you need to use the
DSCP-to-DSCP-mutation map or the policed-DSCP map)
• Configuring Ingress Queue Characteristics, page 37-80 (optional)
• Configuring Egress Queue Characteristics, page 37-84 (optional)
Default Standard QoS Configuration
QoS is disabled. There is no concept of trusted or untrusted ports because the packets are not modified
(the CoS, DSCP, and IP precedence values in the packet are not changed). Traffic is switched in
pass-through mode (packets are switched without any rewrites and classified as best effort without any
policing).
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