Cisco Nexus 6000 User manual

Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration
Guide, Release 7.x
First Published: 2014-01-15
Last Modified: 2016-01-28
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CONTENTS
Preface Preface xiii
Audience xiii
Document Conventions xiii
Related Documentation for Cisco Nexus 6000 Series NX-OS Software xv
Documentation Feedback xvi
Obtaining Documentation and Submitting a Service Request xvii
CHAPTER 1 New and Changed Information 1
New and Changed Information 1
CHAPTER 2 Overview 3
Layer 2 Ethernet Switching Overview 3
VLANs 3
Private VLANs 4
Spanning Tree 4
STP Overview 4
Rapid PVST+ 5
MST 5
STP Extensions 5
CHAPTER 3 Configuring VLANs 7
Information About VLANs 7
Understanding VLANs 7
Understanding VLAN Ranges 8
Creating, Deleting, and Modifying VLANs 9
About the VLAN Trunking Protocol 10
Guidelines and Limitations for VTP 10
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About VLAN Translation 11
Guidelines and Limitations for Configuring VLANs 13
Configuring a VLAN 15
Creating and Deleting a VLAN 15
Configuring VLAN Long-Name 16
Changing the Range of Reserved VLANs 17
Configuring a VLAN 19
Adding Ports to a VLAN 20
Configuring VTP 20
Configuring VLAN Translation on a Trunk Port 22
Configuring VLAN Translation with a FEX 23
Verifying the VLAN Configuration 25
Feature History for Configuring VLANs 25
CHAPTER 4 Configuring Private VLANs 27
Guidelines and Limitations for Private VLANs 27
Information About Private VLANs 28
Primary and Secondary VLANs in Private VLANs 28
Associating Secondary VLANs with a Primary Private VLAN 29
Private VLAN Ports 30
Primary, Isolated, and Community Private VLANs 31
Associating Primary and Secondary VLANs 32
Private VLAN Promiscuous Trunks 33
Private VLAN Isolated Trunks 33
Broadcast Traffic in Private VLANs 34
Private VLAN Port Isolation 34
Configuring a Private VLAN 34
Enabling Private VLANs 34
Configuring a VLAN as a Private VLAN 35
Configuring an Interface as a Private VLAN Host Port 36
Configuring an Interface as a Private VLAN Promiscuous Port 37
Configuring a Promiscuous Trunk Port 38
Configuring an Isolated Trunk Port 39
Configuring the Allowed VLANs for PVLAN Trunking Ports 40
Configuring Native 802.1Q VLANs on Private VLANs 41
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Verifying the Private VLAN Configuration 42
CHAPTER 5 Configuring Rapid PVST+ 43
Information About Rapid PVST+ 43
Understanding STP 43
STP Overview 43
Understanding How a Topology is Created 44
Understanding the Bridge ID 44
Bridge Priority Value 44
Extended System ID 45
STP MAC Address Allocation 45
Understanding BPDUs 46
Election of the Root Bridge 47
Creating the Spanning Tree Topology 47
Understanding Rapid PVST+ 48
Rapid PVST+ Overview 48
Rapid PVST+ BPDUs 49
Proposal and Agreement Handshake 50
Protocol Timers 51
Port Roles 51
Port States 52
Rapid PVST+ Port State Overview 52
Blocking State 53
Learning State 53
Forwarding State 53
Disabled State 54
Summary of Port States 54
Synchronization of Port Roles 54
Processing Superior BPDU Information 55
Processing Inferior BPDU Information 56
Spanning-Tree Dispute Mechanism 56
Port Cost 56
Port Priority 57
Rapid PVST+ and IEEE 802.1Q Trunks 57
Rapid PVST+ Interoperation with Legacy 802.1D STP 57
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Rapid PVST+ Interoperation with 802.1s MST 58
Configuring Rapid PVST+ 58
Enabling Rapid PVST+ 58
Enabling Rapid PVST+ per VLAN 59
Configuring the Root Bridge ID 60
Configuring a Secondary Root Bridge 61
Configuring the Rapid PVST+ Port Priority 62
Configuring the Rapid PVST+ Path-Cost Method and Port Cost 63
Configuring the Rapid PVST+ Bridge Priority of a VLAN 63
Configuring the Rapid PVST+ Hello Time for a VLAN 64
Configuring the Rapid PVST+ Forward Delay Time for a VLAN 65
Configuring the Rapid PVST+ Maximum Age Time for a VLAN 65
Specifying the Link Type 65
Restarting the Protocol 66
Verifying the Rapid PVST+ Configuration 66
CHAPTER 6 Configuring Multiple Spanning Tree 69
Information About MST 69
MST Overview 69
MST Regions 70
MST BPDUs 70
MST Configuration Information 71
IST, CIST, and CST 71
IST, CIST, and CST Overview 71
Spanning Tree Operation Within an MST Region 72
Spanning Tree Operations Between MST Regions 72
MST Terminology 73
Hop Count 74
Boundary Ports 74
Spanning-Tree Dispute Mechanism 75
Port Cost and Port Priority 76
Interoperability with IEEE 802.1D 76
Interoperability with Rapid PVST+: Understanding PVST Simulation 77
Configuring MST 77
MST Configuration Guidelines 77
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Enabling MST 77
Entering MST Configuration Mode 78
Specifying the MST Name 79
Specifying the MST Configuration Revision Number 80
Specifying the Configuration on an MST Region 80
Mapping and Unmapping VLANs to MST Instances 82
Mapping Secondary VLANs to Same MSTI as Primary VLANs for Private VLANs 82
Configuring the Root Bridge 83
Configuring a Secondary Root Bridge 84
Configuring the Port Priority 85
Configuring the Port Cost 86
Configuring the Switch Priority 86
Configuring the Hello Time 87
Configuring the Forwarding-Delay Time 88
Configuring the Maximum-Aging Time 88
Configuring the Maximum-Hop Count 89
Configuring PVST Simulation Globally 89
Configuring PVST Simulation Per Port 90
Specifying the Link Type 91
Restarting the Protocol 92
Verifying the MST Configuration 92
CHAPTER 7 Configuring STP Extensions 93
Overview 93
Information About STP Extensions 93
Understanding STP Port Types 93
Spanning Tree Edge Ports 93
Spanning Tree Network Ports 94
Spanning Tree Normal Ports 94
Understanding Bridge Assurance 94
Understanding BPDU Guard 94
Understanding BPDU Filtering 95
Understanding Loop Guard 96
Understanding Root Guard 97
Configuring STP Extensions 97
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STP Extensions Configuration Guidelines 97
Configuring Spanning Tree Port Types Globally 97
Configuring Spanning Tree Edge Ports on Specified Interfaces 98
Configuring Spanning Tree Network Ports on Specified Interfaces 99
Enabling BPDU Guard Globally 100
Enabling BPDU Guard on Specified Interfaces 101
Enabling BPDU Filtering Globally 102
Enabling BPDU Filtering on Specified Interfaces 103
Enabling Loop Guard Globally 104
Enabling Loop Guard or Root Guard on Specified Interfaces 105
Configuring FEX Port Spanning Tree BPDU Transmit Interval 105
Verifying the STP Extension Configuration 106
CHAPTER 8 Configuring LLDP 107
Configuring LLDP 107
Configuring Interface LLDP 108
CHAPTER 9 Configuring MAC Address Tables 111
Information About MAC Addresses 111
RMAC Learning 111
Configuring MAC Addresses 112
Configuring Static MAC Addresses 112
Configuring the Aging Time for the MAC Table 112
Configuring MAC Move Loop Detection 113
Clearing Dynamic Addresses from the MAC Table 114
Enabling RMAC Learning Feature 114
Verifying the MAC Address Configuration 114
Verifying RMAC Learning Feature 115
CHAPTER 10 Configuring IGMP Snooping 117
Information About IGMP Snooping 117
IGMPv1 and IGMPv2 118
IGMPv3 118
IGMP Snooping Querier 119
IGMP Forwarding 119
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Configuring IGMP Snooping Parameters 120
Verifying the IGMP Snooping Configuration 122
CHAPTER 11 Configuring MVR 125
Information About MVR 125
MVR Overview 125
MVR Interoperation with Other Features 126
Licensing Requirements for MVR 126
Guidelines and Limitations for MVR 126
Default MVR Settings 127
Configuring MVR 127
Configuring MVR Global Parameters 127
Configuring MVR Interfaces 129
Verifying the MVR Configuration 130
CHAPTER 12 Configuring VTP V3 133
Configuring VTP V3 133
VTP V3 Overview 133
Guidelines and Limitation 133
VTP V3 Modes 134
VTP V3 Pruning 135
VTP V3 Per Interface 135
VTP V3 Pruning and Spanning Tree Protocol 135
Default VTP Settings 135
Configuring VTP V3 136
Configuring VTP V3 Pruning 138
CHAPTER 13 Configuring Traffic Storm Control 141
Information About Traffic Storm Control 141
Guidelines and Limitations for Traffic Storm Control 143
Configuring Traffic Storm Control 143
Verifying the Traffic Storm Control Configuration 144
Traffic Storm Control Example Configuration 144
Default Settings for Traffic Storm Control 145
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CHAPTER 14 Configuring the Fabric Extender 147
Information About the Cisco Nexus 2000 Series Fabric Extender 148
Fabric Extender Terminology 149
Fabric Extender Features 149
Layer 2 Host Interfaces 150
Host Port Channel 150
VLANs and Private VLANs 151
Virtual Port Channels 151
Fibre Channel over Ethernet Support 153
Protocol Offload 153
Quality of Service 153
Access Control Lists 154
IGMP Snooping 154
Switched Port Analyzer 154
Fabric Interface Features 154
Oversubscription 155
Management Model 156
Forwarding Model 157
Connection Model 157
Static Pinning Fabric Interface Connection 158
Port Channel Fabric Interface Connection 159
Port Numbering Convention 160
Fabric Extender Image Management 160
Fabric Extender Hardware 160
Chassis 161
Ethernet Interfaces 161
Speed and Duplex Mode 162
Example: Configuring the Interface Speed Parameters 164
Associating a Fabric Extender to a Fabric Interface 165
Associating a Fabric Extender to an Ethernet Interface 165
Associating a Fabric Extender to a Port Channel 166
Disassociating a Fabric Extender from an Interface 168
Configuring Fabric Extender Global Features 168
Enabling the Fabric Extender Locator LED 170
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Redistributing the Links 171
Changing the Number of Links 171
Maintaining the Pinning Order 171
Redistributing Host Interfaces 172
Verifying the Fabric Extender Configuration 173
Verifying the Chassis Management Information 174
Configuring the Cisco Nexus N2248TP-E Fabric Extender 177
Configuring the Shared Buffer 178
Configuring the Queue Limit at the Global Level 179
Configuring the Queue Limit at the Port Level 180
Configuring the Uplink Distance 180
Configuring the Cisco Nexus N2248PQ Fabric Extender 181
Configuring the Shared Buffer 181
Configuring the Uplink Distance 182
Configuring Slow Drain 183
Load-balancing queues at the FEX global level 184
CHAPTER 15 Configuring VM-FEX 185
Information About VM-FEX 185
VM-FEX Overview 185
VM-FEX Components 185
VM-FEX Terminology 186
Licensing Requirements for VM-FEX 187
Default Settings for VM-FEX 187
Configuring VM-FEX 188
Overview of the VM-FEX Configuration Steps 188
Enabling Features Required for VM-FEX 189
Configuring the Fixed Static Interfaces 190
Configuring a Port Profile for the Dynamic Interfaces 193
Configuring an SVS Connection to the vCenter Server 194
Activating an SVS Connection to the vCenter Server 195
Verifying the VM-FEX Configuration 196
Verifying the Status of the Virtual Interfaces 196
Verifying the Connection to the vCenter Server 198
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CHAPTER 16 Configuring MAC/ARP Hardware Resource Carving Template 199
Information About MAC/ARP Hardware Resource Carving Template 199
Configuring the MAC/ARP Hardware Resource Template 200
Applying the Default Template 201
Verifying the MAC/ARP Hardware Resource Carving Template Configuration 201
CHAPTER 17 Configuring VN-Segment 203
Information About VN-Segment 203
Guidelines and Limitations for VN-Segment 205
Enabling VN-Segment 205
Configuring VN-Segment for a VLAN 206
Configuring VN-Segment for VLAN in Configure Sync 207
Configuring VN-Segment in Transit Mode 207
Configuring VN-Segment in Non-Transit Mode 208
Disabling VN-Segment 208
Verifying VN-Segment Configuration 209
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Preface
The preface contains the following sections:
•Audience, page xiii
•Document Conventions, page xiii
•Related Documentation for Cisco Nexus 6000 Series NX-OS Software, page xv
•Documentation Feedback, page xvi
•Obtaining Documentation and Submitting a Service Request, page xvii
Audience
This publication is for network administrators who configure and maintain Cisco Nexus devices.
Document Conventions
As part of our constant endeavor to remodel our documents to meet our customers' requirements, we have
modified the manner in which we document configuration tasks. As a result of this, you may find a
deviation in the style used to describe these tasks, with the newly included sections of the document
following the new format.
Note
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]
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DescriptionConvention
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
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:
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
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Preface
Document Conventions

Related Documentation for Cisco Nexus 6000 Series NX-OS
Software
The entire Cisco NX-OS 6000 Series documentation set is available at the following URL:
http://www.cisco.com/en/US/products/ps12806/tsd_products_support_series_home.html
Release Notes
The release notes are available at the following URL:
http://www.cisco.com/c/en/us/support/switches/nexus-6000-series-switches/products-release-notes-list.html
Configuration Guides
These guides are available at the following URL:
http://www.cisco.com/c/en/us/support/switches/nexus-6000-series-switches/
products-installation-and-configuration-guides-list.html
The documents in this category include:
•Cisco Nexus 6000 Series NX-OS Adapter-FEX Configuration Guide
•Cisco Nexus 6000 Series NX-OS FabricPath Configuration Guide
•Cisco Nexus 6000 Series NX-OS FCoE Configuration Guide
•Cisco Nexus 6000 Series NX-OS Fundamentals Configuration Guide
•Cisco Nexus 6000 Series NX-OS Interfaces Configuration Guide
•Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration Guide
•Cisco Nexus 6000 Series NX-OS Multicast Routing Configuration Guide
•Cisco Nexus 6000 Series NX-OS Quality of Service Configuration Guide
•Cisco Nexus 6000 Series NX-OS SAN Switching Configuration Guide
•Cisco Nexus 6000 Series NX-OS Security Configuration Guide
•Cisco Nexus 6000 Series NX-OS System Management Configuration Guide
•Cisco Nexus 6000 Series NX-OS Unicast Routing Configuration Guide
Installation and Upgrade Guides
These guides are available at the following URL:
http://www.cisco.com/c/en/us/support/switches/nexus-6000-series-switches/products-installation-guides-list.html
The document in this category include:
•Cisco Nexus 6000 Series NX-OS Software Upgrade and Downgrade Guides
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Preface
Related Documentation for Cisco Nexus 6000 Series NX-OS Software

Licensing Guide
The License and Copyright Information for Cisco NX-OS Software is available at http://www.cisco.com/en/
US/docs/switches/datacenter/sw/4_0/nx-os/license_agreement/nx-ossw_lisns.html.
Command References
These guides are available at the following URL:
http://www.cisco.com/c/en/us/support/switches/nexus-6000-series-switches/
products-command-reference-list.html
The documents in this category include:
•Cisco Nexus 6000 Series NX-OS Fabric Extender Command Reference
•Cisco Nexus 6000 Series NX-OS FabricPath Command Reference
•Cisco Nexus 6000 Series NX-OS Fundamentals Command Reference
•Cisco Nexus 6000 Series NX-OS Interfaces Command Reference
•Cisco Nexus 6000 Series NX-OS Layer 2 Interfaces Command Reference
•Cisco Nexus 6000 Series NX-OS Multicast Routing Command Reference
•Cisco Nexus 6000 Series NX-OS Quality of Service Command Reference
•Cisco Nexus 6000 Series NX-OS Security Command Reference
•Cisco Nexus 6000 Series NX-OS System Management Command Reference
•Cisco Nexus 6000 Series NX-OS TrustSec Command Reference
•Cisco Nexus 6000 Series NX-OS Unicast Routing Command Reference
•Cisco Nexus 6000 Series NX-OS Virtual Port Channel Command Reference
Technical References
The Cisco Nexus 6000 Series NX-OS MIB Reference is available at http://www.cisco.com/en/US/docs/switches/
datacenter/nexus6000/sw/mib/reference/NX6000_MIBRef.html.
Error and System Messages
The Cisco Nexus 6000 Series NX-OS System Message Guide is available at http://www.cisco.com/c/en/us/td/
docs/switches/datacenter/nexus6000/sw/system_messages/reference/sl_nxos_book.html.
Troubleshooting Guide
The Cisco Nexus 6000 Series NX-OS Troubleshooting Guide is available at http://www.cisco.com/c/en/us/
support/switches/nexus-6000-series-switches/tsd-products-support-troubleshoot-and-alerts.html.
Documentation Feedback
To provide technical feedback on this document, or to report an error or omission, please send your comments
to: .
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Preface
Documentation Feedback

We appreciate your feedback.
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, using the Cisco Bug Search Tool (BST), submitting a service
request, and gathering additional information, see What's New in Cisco Product Documentation.
To receive new and revised Cisco technical content directly to your desktop, you can subscribe to the What's
New in Cisco Product Documentation RSS feed. RSS feeds are a free service.
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Obtaining Documentation and Submitting a Service Request

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Obtaining Documentation and Submitting a Service Request

CHAPTER 1
New and Changed Information
This chapter contains the following sections:
•New and Changed Information, page 1
New and Changed Information
The following table provides an overview of the significant changes made to this configuration guide. The
table does not provide an exhaustive list of all changes made to this guide or all new features in a particular
release.
Chapter/Topic
Where
Documented
New/Enhanced FeaturesPlatform
Supported
Cisco NX-OS Release Number
Configuring
VLANs
VLAN TranslationCisco Nexus
5500, 5600, and
6000 Series
Switches
7.1(0)N1(1)
Configuring
VLANs
VLAN Long Name supportCisco Nexus
5500, 5600, and
6000 Series
Switches
7.3(0)N1(1)
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New and Changed Information
New and Changed Information