Name: Cisco Catalyst 3750-X
Brand: Cisco
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CHAPTER

39-1

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

OL-21521-01

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-X or 3560-X switch. With QoS,

ou 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-X or 3560-X standalone switch and to a Catalyst 3750-X switch

stack.

The switch supports QoS for both IPv4and IPv6 traffic when a dual IPv4 and IPv6 SDM template is

conf

igured.

Note IPv6 QoS is not supported on switches running the LAN base feature set.

You can configure QoS on physical ports and on switch virtual interfaces (SVIs). Other than to apply

olicy 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 switch documentation for the

Catalyst 3750 Metro switch, Cisco ME 3400E Series Ethernet Access Switch, and Cisco ME 3400 Series

Ethernet Access Switch

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

reference for this release.

• Understanding QoS, page 39-2

• Configuring Auto-QoS, page 39-23

• Displaying Auto-QoS Information, page 39-33

• Configuring Standard QoS, page 39-33

• Displaying Standard QoS Information, page 39-87

The switch supports some of the modular QoS CLI (MQC) commands. For more information about the

C commands, see the “Modular Quality of Service Command-Line Interface Overview” at this site:

http://www.cisco.com/en/US/products/sw/iosswrel/ps18

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