C HAPTER
3
Overview of QoS Support on
Catalyst Platforms and Exploring
QoS on the Catalyst 2900XL,
3500XL, and Catalyst 4000 CatOS
Family of Switches
Previous chapters described the necessity for QoS in campus networks and the funda-
mentals behind QoS operation. This chapter explains the various platform QoS features
available across the Cisco Catalyst product family. A group of concise tables in the
beginning of this chapter provides a quick reference for QoS features available for each
Catalyst platform. In addition, this chapter, along with subsequent chapters, begins the
product tour of the access layer Catalyst switches with the fewest QoS features and
continues with the high-end core Catalyst switches with industry-leading QoS features.
Although the access layer switches support only a few QoS features, these switches provide
an excellent foundation for exploring QoS fundamentals in the campus network.
Specifically, this chapter covers the following topics:
Brief Per–Catalyst Platform QoS Features Table
QoS Features Overview
QoS Features on the Catalyst 2900XL and 3500XL Switches
QoS Features on the Catalyst 4000 CatOS Switches
The Cisco Catalyst 2900XL, 3500XL, and 4000 Family of switches share Layer 2 QoS
features needed on access layer switches. These features include the following:
Classification
Marking
Congestion Management
This chapter covers these topics on the respective platforms with command references,
examples, and case studies. Upon completion of this chapter, you will understand each
Catalyst platform’s supported QoS features and be able to configure the Catalyst 2900XL,
500XL, and 4000 CatOS Family of switches for packet classification, marking, and
congestion management.

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