CHAPTER
29-1
Catalyst 3550 Multilayer Switch Software Configuration Guide
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Configuring QoS
This chapter describes how to configure quality of service (QoS) by using automatic QoS (auto-QoS)
commands or by using standard QoS commands. With QoS, you can give preferential treatment to
certain traffic at the expense of others. Without QoS, the Catalyst 3550 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.
Note For complete syntax and usage information for the commands used in this chapter, refer to the command
reference for this release.
This chapter consists of these sections:
• Understanding QoS, page 29-2
• Configuring Auto-QoS, page 29-17
• Displaying Auto-QoS Information, page 29-22
• Auto-QoS Configuration Example, page 29-23
• Configuring Standard QoS, page 29-25
• Displaying Standard QoS Information, page 29-69
• Standard QoS Configuration Examples, page 29-69
Note When you are configuring QoS parameters for the switch, in order to allocate system resources to
maximize the number of possible QoS access control entries (ACEs) allowed, you can use the sdm
prefer access global configuration command to set the Switch Database Management feature to the
access template. For more information on the SDM templates, see the “Optimizing System Resources
for User-Selected Features” section on page 7-27.
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