Chapter 25 Configuring Qos; Understanding Qos - Cisco Catalyst 2360 Software Configuration Manual

Configuring QoS
This chapter describes how to configure quality of service (QoS) using standard QoS commands. 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.
You can configure these basic QoS features on physical ports of the switch.
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For complete syntax and usage information for the commands used in this chapter, see the command
Note
reference this release.
This chapter consists of these sections:
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Understanding QoS

Typically, networks operate on a best-effort delivery basis, which means that all traffic has equal priority
and an equal chance of being delivered in a timely manner. When congestion occurs, all traffic has an
equal chance of being dropped.
When you configure the QoS feature, you can select specific network traffic, prioritize it according to
its relative importance, and use congestion-management and congestion-avoidance techniques to
provide preferential treatment. Implementing QoS in your network makes network performance more
predictable and bandwidth utilization more effective.
OL-19808-01
IEEE 802.1p class of service (CoS)
Four egress queues per port to enable differentiated management of different traffic types across the
stack
Understanding QoS, page 25-1
Configuring QoS, page 25-3
Displaying QoS Information, page 25-8
C H A P T E R
Catalyst 2360 Switch Software Configuration Guide
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