Configuring Qos; Default Qos Configuration - Cisco 2950G 24 - Catalyst Switch Software Configuration Manual

Chapter 26

Configuring QoS

Configuring QoS
Before configuring QoS, you must have a thorough understanding of these items:
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This section describes how to configure QoS on your switch:
Note If your switch is running the SI, you can configure only the features described in the
Classification Using Port Trust
display the QoS information as described in the
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Default QoS Configuration

This is the default 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.
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Note In software releases earlier than 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
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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.
Default QoS Configuration, page 26-9
Configuration Guidelines, page 26-10
Configuring Classification Using Port Trust States, page 26-10
Configuring a QoS Policy, page 26-16
Configuring CoS Maps, page 26-24
Configuring CoS and WRR, page 26-27
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
The default DSCP-to-CoS map is shown in
For default QoS and WRR values, see the
States" and the "Configuring CoS and
"Displaying QoS
Table 26-3.
Table 26-4.
"Configuring CoS and WRR" section on page
"Enabling Pass-Through Mode" section on page
Catalyst 2950 Desktop Switch Software Configuration Guide
Configuring QoS
"Configuring
WRR" sections. You can also
Information" section.
26-15.
26-27.
26-9