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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
OL-10101-02
Chapter 29 Configuring QoS
Configuring Standard QoS
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 29-17
• Configuration Guidelines, page 29-17
• Configuring Classification Using Port Trust States, page 29-19
• Configuring a QoS Policy, page 29-24
• Configuring CoS Maps, page 29-32
• Configuring the Egress Queues, page 29-35
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 29-35.
Note In software releases earlier than Cisco IOS Release 12.1(11)EA1, the switch uses the CoS value of
incoming packets without modifying the DSCP value. You can configure this by enabling pass-through
mode on the port. For more information, see the “Enabling Pass-Through Mode” section on page 29-23.
Configuration Guidelines
Note These guidelines are applicable only if your switch is running the EI.
Before beginning the QoS configuration, you should be aware of this information: