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CHAPTER
26-1
Catalyst 2950 Desktop Switch Software Configuration Guide
78-14982-01
26
Configuring QoS
This chapter describes how to configure quality of service (QoS) by using QoS commands. With QoS,
you can provide preferential treatment to certain types of traffic at the expense of others. Without QoS,
the switch offers best-effort service to each packet, regardless of the packet contents or size. It sends the
packets without any assurance of reliability, delay bounds, or throughput.
To use the features described in this chapter, you must have the enhanced software image (EI) installed
on your switch.
If you have the standard software image (SI) installed on your switch, you cannot configure some of the
features. Table 26-1 lists the sections that describe the features that you can configure.
Note For complete syntax and usage information for the commands used in this chapter, refer to the command
reference for this release.
QoS can be configured either by using the Cluster Management Suite (CMS) or through the
command-line interface (CLI). Refer to the CMS online help for configuration procedures through CMS.
For information about accessing and using CMS, see Chapter 3, “Getting Started with CMS.”
You can also use these wizards to configure QoS only if your switch is running the EI:
• Priority data wizard—Lets you assign priority levels to data applications based on their TCP or UDP
ports. It provides a standard list of applications, and you select the ones that you want to prioritize,
the priority levels, and the interfaces where the prioritization occurs. Refer to the priority data
wizard online help for procedures about using this wizard.
Table 26-1 Sections Describing Standard Software Features
Topic Section
Queueing and scheduling at
the egress ports
“Queueing and Scheduling” section on page 26-7
Configuring QoS “Configuring QoS” section on page 26-9
“Default QoS Configuration” section on page 26-9
“Configuring Classification Using Port Trust States”
section on page 26-10
“Configuring CoS and WRR” section on page 26-27