Cisco Catalyst 3120 User Manual

CHAPTER
36-1
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
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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 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 standalone switch and to a 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.
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 36-20
• Displaying Auto-QoS Information, page 36-29
• Configuring Standard QoS, page 36-29
• Displaying Standard QoS Information, page 36-78
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

Cisco Catalyst 3120 Specifications

General

Brand	Cisco
Model	Catalyst 3120
Category	Switch
Language	English