Configuring Quality Of Service - Cisco Catalyst 4500 series Administration Manual

Configuring Quality of Service

This chapter describes how to configure quality of service (QoS) with either automatic QoS (auto-QoS)
commands or standard QoS commands on a Catalyst 4500 Series Switch. It describes how to specify
QoS configuration on different types of interfaces (access, Layer 2 trunk, Layer 3 routed, Etherchannel)
as well as VLANs. It also describes how to specify different QoS configurations on different VLANs on
a given interface (per-port per-VLAN QoS).
A switch supports a QoS configuration model known as MQC (Modular QoS CLI). Please refer to the
appropriate configuration section for the supervisor engine on which QoS will be configured. For more
information about MQC, see the "Modular Quality of Service Command-Line Interface" section of the
Cisco IOS Quality of Service Solutions Configuration Guide, Release 12.3.
This chapter addresses both VSS and non-VSS environments. Sections include:
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For complete syntax and usage information for the switch commands used in this chapter, see the Cisco
Note
Catalyst 4500 Series Switch Command Reference and related publications at this location:
http://www.cisco.com/en/US/products/hw/switches/ps4324/index.html
If a command is not in the Catalyst 4500 Series Switch Command Reference, you can locate it in the
Cisco IOS library. See the Cisco IOS Command Reference and related publications at this location:
http://www.cisco.com/en/US/products/ps6350/index.html
Overview of 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.
OL_28731-01
Overview of QoS, page 42-1
Configuring VSS QoS, page 42-13
Configuring QoS on a Standalone Supervisor Engine 6-E/6L-E or Supervisor Engine 7-E/7L-E/8-E,
page 42-47
Configuring VSS Auto-QoS, page 42-81
Configuring Auto-QoS on a Standalone Supervisor Engine 6-E/6L-E or Supervisor Engine
7-E/7L-E/8-E, page 42-86
C H A P T E R
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
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