Cisco Nexus 7000 Series User manual

Cisco Nexus 7000 Series NX-OS Quality of Service Configuration Guide
Last Modified: 2016-05-11
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CONTENTS
Preface xi
PREFACE
Audience xi
Document Conventions xi
Related Documentation for Cisco Nexus 7000 Series NX-OS Software xii
Documentation Feedback xiv
Obtaining Documentation and Submitting a Service Request xv
New and Changed Information 1
CHAPTER 1
New and Changed Information 1
Overview 3
CHAPTER 2
Information About QoS Features 3
Using QoS 4
Classification 4
Marking 4
Mutation 5
Policing 5
Queuing and Scheduling 5
Sequencing of QoS Actions 5
Sequencing of Ingress Traffic Actions 6
Sequencing of Egress Traffic Actions 6
High Availability Requirements for QoS Features 6
QoS Feature Configuration with MQC 7
QoS Statistics 7
Default QoS Behavior 7
QoS Policies on Fabric Extenders 8
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Using Modular QoS CLI 9
CHAPTER 3
Finding Feature Information 9
Information About MQC 9
Licensing Requirements 10
Using an MQC Object 11
Type qos Policies 11
Type Queuing Policies 13
System-Defined MQC Objects 14
Configuring an MQC Object 18
Configuring or Modifying a Class Map 19
Configuring or Modifying a Table Map 20
Configuring or Modifying a Policy Map 21
Applying Descriptions to MQC Objects 22
Verifying an MQC Object 23
Attaching and Detaching a QoS Policy Action 23
Attaching a QoS Policy Action to an Interface or Tunnel 25
Attaching a QoS Policy Action to a VLAN 26
Session Manager Support for QoS 26
Feature History for Using Modular QoS CLI 26
Configuring Classification 29
CHAPTER 4
Finding Feature Information 29
Information About Classification 29
Licensing Requirements 31
Prerequisites for Classification 31
Guidelines and Limitations 31
Configuring Traffic Classes 32
Configuring ACL Classification 32
Configuring a Deny ACE 33
Configuring DSCP Classification 34
Configuring IP Precedence Classification 35
Configuring Protocol Classification 37
Configuring QoS Group Classification 38
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Configuring Discard Class Classification 39
Configuring Layer 3 Packet Length Classification 39
Configuring CoS Classification 40
Configuring IP RTP Classification 41
Configuring Class Map Classification 42
Verifying the Classification Configuration 43
Configuration Examples for Classification 43
Feature History for Classification 43
Configuring Marking 45
CHAPTER 5
Finding Feature Information 45
Information About Marking 45
Licensing Requirements 46
Prerequisites for Marking 46
Guidelines and Limitations 47
Configuring Marking 47
Configuring DSCP Marking 48
Configuring IP Precedence Marking 50
Configuring CoS Marking 51
Configuring QoS Group Marking 52
Configuring Discard Class Marking 52
Configuring Ingress and Egress Marking 53
Configuring DSCP Port Marking 54
Configuring Table Maps for Use in Marking 55
Configuring Marking Using Table Maps 56
Verifying the Marking Configuration 57
Configuration Examples for Marking 58
Feature History for Marking 58
Configuring Mutation Mapping 59
CHAPTER 6
Finding Feature Information 59
Information About Mutation Mapping 59
Licensing Requirements 60
Prerequisites for Mutation Mapping 60
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Guidelines and Limitations 61
Configuring Mutation Mapping 61
Verifying the Mutation Mapping Configuration 62
Configuration Examples for Mutation Mapping 63
Feature History for Mutation Mapping 63
Configuring Policing 65
CHAPTER 7
Finding Feature Information 65
Information About Policing 65
Shared Policers 66
Licensing Requirements 66
Prerequisites for Policing 66
Guidelines and Limitations 67
Configuring Policing 68
Configuring 1-Rate and 2-Rate, 2-Color and 3-Color Policing 68
Configuring Color-Aware Policing 72
Configuring Ingress and Egress Policing 75
Configuring Markdown Policing 76
Configuring Shared Policers 77
Verifying the Policing Configuration 78
Configuration Examples for Policing 79
Feature History for Policing 80
Configuring Fabric QoS Mapping 81
CHAPTER 8
Finding Feature Information 81
Information About Fabric QoS Mapping 81
COS-to-Queue Fabric Mapping 81
Ingress Buffer Policy 82
Egress Queue Bandwidth Allocation 82
Guidelines and Limitations 82
Configuring Fabric QoS Mapping 83
Copying a Default Policy 83
Configuring Cos2q Fabric Mapping 83
Configuring Ingress Buffer Policy 84
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Configuring Egress Queue Bandwidth Allocation 84
Configuring the New User-defined Policy on Fabric 85
Configuration Examples for Fabric QoS Mapping 86
Example: Copying Default Policy to Create a new User-defined Ingress and Egress Policy 86
Example: Configuring Cos2q Fabric Mapping 86
Example: Configuring the User-defined Policy on Fabric 86
Example: Verifying System Fabric Configuration 86
Example: Verifying the QoS Mapping on Fabric 87
Feature History for Fabric QoS Mapping 88
Configuring Queuing and Scheduling on M-Series I/O Modules 89
CHAPTER 9
Finding Feature Information 89
Information About Queuing and Scheduling 89
Setting Ingress Port CoS 91
Modifying Class Maps 91
Congestion Avoidance 92
Congestion Management 92
Virtualization Support 92
Licensing Requirements 92
Prerequisites for Queuing and Scheduling 93
Guidelines and Limitations 93
Configuring Queuing and Scheduling 94
Configuring Ingress Port CoS 95
Modifying Queuing Class Maps for COS 96
Modifying Queuing Class Maps for DSCP 97
Configuring Congestion Avoidance 98
Configuring Tail Drop by COS Values 99
Configuring Tail Drop by DSCP Values 100
Configuring WRED by COS Values 101
Configuring WRED by DSCP Values 102
Configuring Congestion Management 104
Configuring Bandwidth and Bandwidth Remaining 104
Configuring Priority 105
Configuring Shaping 106
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Configuring Queue Limits 108
Enabling DSCP to Queue Mapping 109
Verifying the Queuing and Scheduling Configuration 109
Configuration Examples for Queuing and Scheduling 110
Example: Setting Ingress Port CoS Configuration 110
Example: Priority and Queue Limit Configuration 110
Example: Shaping and Tail Drop Configuration 111
Example: Bandwidth and WRED Configuration 111
Example: Verifying the Status of DSCP-to-queue Mapping 112
Feature History for Queuing and Scheduling 112
Configuring Queuing and Scheduling on F-Series I/O Modules 113
CHAPTER 10
Finding Feature Information 113
Information About Queuing and Scheduling 113
Ingress Queuing 114
Egress Queuing 120
Shared Buffer Queuing on the F3 Series Module 122
Prerequisites for Queuing and Scheduling 123
Guidelines and Limitations 123
Configuring Queuing and Scheduling 126
Configuring an Ingress Queuing Policy 126
Configuring an Egress Queuing Policy 128
Enabling DSCP to Queue Mapping 129
Configuring Shared Buffer Queuing 129
Verifying the Queuing and Scheduling Configuration 130
Configuration Examples for Queuing and Scheduling on F-Series Modules 131
Example: Ingress Queuing Policy Configuration 131
Example: Egress Queuing Policy Configuration 131
Example: Hierarchical Queuing Policy Configuration 132
Example: Verifying the Status of DSCP-to-queue Mapping 132
Feature History for Queuing and Scheduling for F-Series Modules 132
Configuring Network QoS 135
CHAPTER 11
Finding Feature Information 135
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Information About Network QoS 135
Differences in Drop CoS and No-Drop CoS Values 136
Queue Names and Default Mappings of CoS Values to Egress/Ingress Queues 137
Default DSCP Mappings 140
Licensing Requirements 141
Prerequisites for Network QoS 141
Guidelines and Limitations 142
Configuring Network QoS Policies 143
Configure a User-Defined Network 144
Applying a Network QoS Policy on a Target 145
Verifying the Network QoS 145
Configuration Examples for Network QoS 146
Feature History for Network QoS 146
Configuring Priority Flow Control 147
CHAPTER 12
Finding Feature Information 147
Information About Priority Flow Control 147
Licensing Requirements 148
Prerequisites for Priority Flow Control 148
Guidelines and Limitations 148
Default Settings for Priority Flow Control 149
Configuring Priority Flow Control 149
Verifying the Priority Flow Control Configuration 150
Configuration Examples for Priority Flow Control 150
Feature History for Priority Flow Control 150
Configuring Local Policy-Based Routing 151
CHAPTER 13
Finding Feature Information 151
Information About Local Policy-Based Routing 151
Route Maps 152
Match Criteria 152
Set Changes 152
Licensing Requirements 152
Prerequisites for Local Policy-Based Routing 153
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Guidelines and Limitations 153
Default Settings for Local Policy-Based Routing 153
Configuring Local Policy-Based Routing 154
Configuring Route Maps 154
154
154
Enabling the Policy-Based Routing Feature 155
Configuring a Local Route Policy 155
Verifying the Local Policy-Based Routing Configuration 156
Configuration Example for Local Policy-Based Routing 156
Feature History for Local Policy-Based Routing 156
Monitoring QoS Statistics 157
CHAPTER 14
Finding Feature Information 157
Information About QoS Statistics 157
Licensing Requirements 157
Prerequisites for Monitoring QoS Statistics 158
Enabling Statistics 158
Monitoring the Statistics 158
Clearing Statistics 159
Configuration Examples For Monitoring QoS Statistics 159
Feature History for Statistics 161
Configuration Limits for Quality of Service Configuration Features 163
APPENDIX A
Configuration Limits for QoS 163
Additional References Appendix 165
APPENDIX B
Related Documents 165
RFCs 165
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