Cisco Nexus 5000 Series User manual

Cisco Nexus 5000 Series NX-OS Quality of Service Configuration
Guide
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Text Part Number: OL-20921-01

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CONTENTS
Preface Preface vii
Audience vii
Document Organization vii
Document Conventions viii
Related Documentation for Nexus 5000 Series NX-OS Software ix
Obtaining Documentation and Submitting a Service Request x
CHAPTER 1 New and Changed Information 1
New and Changed Information 1
CHAPTER 2 Overview 3
Overview 3
CHAPTER 3 Configuring QoS 5
Information About QoS 5
MQC 6
System Classes 7
Default System Classes 7
Policy Types 8
Link-Level Flow Control 10
Priority Flow Control 10
MTU 11
Trust Boundaries 11
Ingress Queuing Policies 12
Ingress Classification Policies 12
Egress Queuing Policies 12
QoS for Multicast Traffic 13
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Policy for Fibre Channel Interfaces 13
QoS for Traffic Directed to the CPU 14
QoS Configuration Guidelines and Limitations 14
Configuring System Classes 15
Configuring Class Maps 15
Configuring ACL Classification 16
Configuring CoS Classification 17
Configuring DSCP Classification 18
Configuring IP RTP Classification 19
Configuring Precedence Classification 20
Configuring Protocol Classification 22
Configuring QoS Group Classification 23
Configuring Policy Maps 24
Configuring Type QoS Policies 26
Configuring Type Network QoS Policies 27
Configuring Type Queuing Policies 29
Information About Marking 30
Configuring CoS Marking 30
Attaching the System Service Policy 31
Restoring the Default System Service Policies 32
Configuring the Queue Limit for Fabric Extenders 34
Enabling the Jumbo MTU 35
Verifying the Jumbo MTU 35
Configuring QoS on Interfaces 36
Configuring Untagged CoS 36
Configuring Interface Service Policy 37
Configuring the Queue Limit for a Specified Fabric Extender 38
Configuring No-Drop Buffer Thresholds 40
Configuring the Buffer Threshold for the Cisco Nexus 2148T Fabric Extender 41
Configuring Priority Flow Control and Link-Level Flow Control 42
Configuring Priority Flow Control 43
Configuring Link-Level Flow Control 43
Enabling Virtual Output Queuing Limits for Unicast Traffic on the Cisco Nexus 5548
Switch 44
Verifying QoS Configuration 45
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Example QoS Configurations 51
QoS Example 1 51
QoS Example 2 52
QoS Example 3 54
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Contents

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Preface
This preface describes the audience, organization, and conventions of the Cisco Nexus 5000 Series NX-OS
Quality of Service Configuration Guide. It also provides information on how to obtain related documentation.
•Audience, page vii
•Document Organization, page vii
•Document Conventions, page viii
•Related Documentation for Nexus 5000 Series NX-OS Software, page ix
•Obtaining Documentation and Submitting a Service Request, page x
Audience
This preface describes the audience, organization, and conventions of the . It also provides information on
how to obtain related documentation.
Document Organization
This document is organized into the following chapters:
DescriptionChapter
Describes the new and changed information for the new Cisco NX-OS
software releases.
New and Changed Information
Describes the Quality of Service features supported by the Cisco NX-OS
software.
Overview
Describes Quality of Service, guidelines and limitations, and information
about how to configure the Quality of Service feature.
Configuring Quality of Service
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Document Conventions
Command descriptions use the following conventions:
DescriptionConvention
Bold text indicates the commands and keywords that you enter literally
as shown.
bold
Italic text indicates arguments for which the user supplies the values.
Italic
Square brackets enclose an optional element(keyword or argument).[x]
Square brackets enclosing keywords or arguments separated by a vertical
bar indicate an optional choice.
[x | y]
Braces enclosing keywords or arguments separated by a vertical bar
indicate a required choice.
{x | y}
Nested set of square brackets or braces indicate optional or required
choices within optional or required elements. Braces and a vertical bar
within square brackets indicate a required choice within an optional
element.
[x {y | z}]
Indicates a variable for which you supply values, in context where italics
cannot be used.
variable
A nonquoted set of characters. Do not use quotation marks around the
string or the string will include the quotation marks.
string
Screen examples use the following conventions:
DescriptionConvention
Terminal sessions and information the switch displays are in screen font.screen font
Information you must enter is in boldface screen font.boldface screen font
Arguments for which you supply values are in italic screen font.italic screen font
Nonprinting characters, such as passwords, are in angle brackets.< >
Default responses to system prompts are in square brackets.[ ]
An exclamation point (!) or a pound sign (#) at the beginning of a line
of code indicates a comment line.
!, #
This document uses the following conventions:
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Preface
Document Conventions

Means reader take note. Notes contain helpful suggestions or references to material not covered in the
manual.
Note
Means reader be careful. In this situation, you might do something that could result in equipment damage
or loss of data.
Caution
Related Documentation for Nexus 5000 Series NX-OS Software
Cisco NX-OS documentation is available at the following URL:
http://www.cisco.com/en/US/products/ps9670/tsd_products_support_series_home.htmll
The documentation set for the Cisco Nexus 5000 Series NX-OS software includes the following documents:
Release Notes
•Cisco Nexus 5000 Series and Cisco Nexus 2000 Series Release Notes
•Cisco Nexus 5000 Series Switch Release Notes
Cisco Nexus 5000 Series NX-OS Configuration Guides
•Cisco Nexus 5000 Series NX-OS Fibre Channel over Ethernet Configuration Guide
•Cisco Nexus 5000 Series NX-OS Layer 2 Switching Configuration Guide
•Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide
•Cisco Nexus 5000 Series NX-OS SAN Switching Configuration Guide
•Cisco Nexus 5000 Series NX-OS Security Configuration Guide
•Cisco Nexus 5000 Series NX-OS System Management Configuration Guide
•Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
•Cisco Nexus 5000 Series Fabric Manager Configuration Guide, Release 3.4(1a)
Installation and Upgrade Guides
•Cisco Nexus 5000 Series Hardware Installation Guide
•Regulatory Compliance and Safety Information for the Cisco Nexus 5000 Series
Cisco NX-OS Command References
•Cisco Nexus 5000 Series Command Reference
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Preface
Related Documentation for Nexus 5000 Series NX-OS Software

Cisco NX-OS Technical References
•Cisco Nexus 5000 MIBs Reference
Cisco NX-OS Error and System Messages
•Cisco NX-OS System Messages Reference
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, submitting a service request, and gathering additional information,
see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco
technical documentation, at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
Subscribe to the What's New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed
and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free
service and Cisco currently supports RSS version 2.0.
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Obtaining Documentation and Submitting a Service Request