C H A P T E R 36

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 on the Catalyst 3750-E or 3560-E switch. 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. Unless otherwise noted, the term switch refers to a Catalyst 3750-E or 3560-E standalone switch and to a Catalyst 3750-E switch stack.

You can configure QoS on physical ports and on switch virtual interfaces (SVIs). Other than to apply policy maps, you configure the QoS settings, such as classification, queueing, and scheduling, the same way on physical ports and SVIs. When configuring QoS on a physical port, you apply a nonhierarchical policy map. When configuring QoS on an SVI, you apply a nonhierarchical or a hierarchical policy map.

Nonhierarchical policy maps are referred to as nonhierarchical single-level policy maps, and hierarchical policy maps are referred to as hierarchical dual-level policy maps in this switch documentation:

Catalyst 3750 Metro switch

Cisco ME 3400 Series Ethernet Access Switch

Cisco ME 2400 Series Ethernet Access Switch

Note For complete syntax and usage information for the commands used in this chapter, see the command reference this release.

This chapter consists of these sections:

Understanding QoS, page 36-2

Configuring Auto-QoS, page 36-22

Displaying Auto-QoS Information, page 36-32

Configuring Standard QoS, page 36-32

Displaying Standard QoS Information, page 36-81

The switch supports some of the modular QoS CLI (MQC) commands. For more information about the MQC commands, see the “Modular Quality of Service Command-Line Interface Overview” at this site:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter0918 6a00800bd908.html9

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

 

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Cisco Systems 3750E manual Configuring QoS, 36-1