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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 29 Configuring QoS
Configuring Standard QoS
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.
This section describes how to configure standard QoS on your switch:
Note If your switch is running the SI, you can configure only the features described in the “Configuring
Classification Using Port Trust States” and the “Configuring the Egress Queues” sections. You can also
display the QoS information as described in the “Displaying Standard QoS Information” section.
• Default Standard QoS Configuration, page 29-18
• Configuration Guidelines, page 29-19
• Configuring Classification Using Port Trust States, page 29-20
• Configuring a QoS Policy, page 29-26
• Configuring CoS Maps, page 29-34
• Configuring the Egress Queues, page 29-37
Default Standard QoS Configuration
This is the default standard QoS configuration:
Note You can configure policy maps, policers, the CoS-to-DSCP map, and the DSCP-to-CoS map only if your
switch is running the EI.
• The default port CoS value is 0.
• The CoS value of 0 is assigned to all incoming packets.
• The default port trust state is untrusted.
• No policy maps are configured.
• No policers are configured.
• The default CoS-to-DSCP map is shown in Table 29-7.
• The default DSCP-to-CoS map is shown in Table 29-8.
• The default scheduling method for the egress queues is strict priority.
• For default CoS and WRR values, see the “Configuring the Egress Queues” section on page 29-37.
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