Cisco Nexus 5000 Series User manual

Cisco Nexus 5000 Series NX-OS Layer 2 Switching Configuration
Guide, Release 5.0(3)N1(1)

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CONTENTS
Preface Preface xv
Audience xv
Document Organization xv
Document Conventions xvi
Related Documentation for Nexus 5000 Series NX-OS Software xvi
Obtaining Documentation and Submitting a Service Request xviii
CHAPTER 1 New and Changed Information 1
New and Changed Information 1
CHAPTER 2 Overview 7
Layer 2 Ethernet Switching Overview 7
VLANs 7
Private VLANs 8
Spanning Tree 8
STP Overview 8
Rapid PVST+ 9
MST 9
STP Extensions 9
CHAPTER 3 Configuring Ethernet Interfaces 11
Information About Ethernet Interfaces 11
About the Interface Command 11
Information About Unified Ports 12
About the Unidirectional Link Detection Parameter 12
Default UDLD Configuration 13
UDLD Aggressive and Nonaggressive Modes 14
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About Interface Speed 14
About the Cisco Discovery Protocol 14
Default CDP Configuration 15
About the Error-Disabled State 15
Information About Port Profiles 15
Guidelines and Limitations 16
About the Debounce Timer Parameters 17
About MTU Configuration 17
Configuring Ethernet Interfaces 17
Configuring a Layer 3 Interface on a Cisco Nexus 5500 Platform Switch 18
Configuring Unified Ports 18
Configuring the UDLD Mode 20
Configuring Interface Speed 21
Configuring the CDP Characteristics 22
Enabling or Disabling CDP 23
Enabling the Error-Disabled Detection 24
Enabling the Error-Disabled Recovery 25
Configuring the Error-Disabled Recovery Interval 26
Configuring Port Profiles 27
Creating a Port Profile 27
Modifying a Port Profile 29
Enabling a Specific Port Profile 30
Inheriting a Port Profile 31
Removing an Inherited Port Profile 33
Assigning a Port Profile to a Range of Interfaces 34
Removing a Port Profile from a Range of Interfaces 35
Configuration Examples for Port Profiles 36
Configuring the Debounce Timer 37
Configuring the Description Parameter 38
Disabling and Restarting Ethernet Interfaces 39
Displaying Interface Information 39
Default Physical Ethernet Settings 42
CHAPTER 4 Configuring VLANs 43
Information About VLANs 43
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Understanding VLANs 43
Understanding VLAN Ranges 44
Creating, Deleting, and Modifying VLANs 45
About the VLAN Trunking Protocol 46
Guidelines and Limitations 46
Configuring a VLAN 47
Creating and Deleting a VLAN 47
Entering the VLAN Submode and Configuring the VLAN 48
Adding Ports to a VLAN 49
Configuring VTP 50
Verifying VLAN Configuration 52
CHAPTER 5 Configuring Private VLANs 55
Information About Private VLANs 55
Primary and Secondary VLANs in Private VLANs 56
Private VLAN Ports 56
Primary, Isolated, and Community Private VLANs 57
Associating Primary and Secondary VLANs 58
Private VLAN Promiscuous Trunks 59
Private VLAN Isolated Trunks 59
Broadcast Traffic in Private VLANs 60
Private VLAN Port Isolation 60
Guidelines and Limitations for Private VLANs 60
Configuring a Private VLAN 60
Enabling Private VLANs 60
Configuring a VLAN as a Private VLAN 61
Associating Secondary VLANs with a Primary Private VLAN 62
Configuring an Interface as a Private VLAN Host Port 63
Configuring an Interface as a Private VLAN Promiscuous Port 64
Configuring a Promiscuous Trunk Port 65
Configuring an Isolated Trunk Port 67
Configuring the Allowed VLANs for PVLAN Trunking Ports 68
Configuring Native 802.1Q VLANs on Private VLANs 69
Verifying Private VLAN Configuration 69
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CHAPTER 6 Configuring Access and Trunk Interfaces 71
Information About Access and Trunk Interfaces 71
Understanding Access and Trunk Interfaces 71
Understanding IEEE 802.1Q Encapsulation 73
Understanding Access VLANs 73
Understanding the Native VLAN ID for Trunk Ports 74
Understanding Allowed VLANs 74
Understanding Native 802.1Q VLANs 74
Configuring Access and Trunk Interfaces 75
Configuring a LAN Interface as an Ethernet Access Port 75
Configuring Access Host Ports 76
Configuring Trunk Ports 77
Configuring the Native VLAN for 802.1Q Trunking Ports 78
Configuring the Allowed VLANs for Trunking Ports 78
Configuring Native 802.1Q VLANs 79
Verifying Interface Configuration 80
CHAPTER 7 Configuring EtherChannels 81
Information About EtherChannels 81
Understanding EtherChannels 81
Compatibility Requirements 82
Load Balancing Using EtherChannels 84
Understanding LACP 86
LACP Overview 86
LACP ID Parameters 87
Channel Modes 88
LACP Marker Responders 89
LACP-Enabled and Static EtherChannels Differences 89
Configuring Port Channels 89
Creating an EtherChannel 89
Adding a Port to an EtherChannel 90
Configuring Load Balancing Using EtherChannels 91
Configuring Hardware Hashing for Multicast Traffic 93
Enabling LACP 93
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Configuring the Channel Mode for a Port 94
Configuring the LACP Fast Timer Rate 95
Configuring the LACP System Priority and System ID 96
Configuring the LACP Port Priority 97
Disabling LACP Graceful Convergence 98
Reenabling LACP Graceful Convergence 99
Verifying EtherChannel Configuration 100
Verifying the Load-Balancing Outgoing Port ID 101
CHAPTER 8 Configuring Virtual Port Channels 103
Information About vPCs 103
vPC Overview 103
Terminology 105
vPC Terminology 105
Fabric Extender Terminology 105
Supported vPC Topologies 106
Cisco Nexus 5000 Series Switch vPC Topology 106
Single Homed Fabric Extender vPC Topology 107
Dual Homed Fabric Extender vPC Topology 108
vPC Domain 108
Peer-Keepalive Link and Messages 109
Compatibility Parameters for vPC Peer Links 109
Configuration Parameters That Must Be Identical 109
Configuration Parameters That Should Be Identical 111
Graceful Type-1 Check 111
Per-VLAN Consistency Check 112
vPC Auto-Recovery 112
vPC Peer Links 112
vPC Peer Link Overview 112
vPC Number 113
vPC Interactions with Other Features 114
vPC and LACP 114
vPC Peer Links and STP 114
CFSoE 115
vPC Guidelines and Limitations 115
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Configuring vPCs 116
Enabling vPCs 116
Disabling vPCs 116
Creating a vPC Domain 117
Configuring a vPC Keepalive Link and Messages 118
Configuring a Keepalive Link When Using a Front-Panel 10-Gigabit Ethernet Port 120
Creating a vPC Peer Link 121
Checking the Configuration Compatibility 122
Enabling vPC Auto-Recovery 123
Configuring the Restore Time Delay 124
Excluding VLAN Interfaces From Shutdown When vPC Peer Link Fails 124
Configuring the VRF Name 125
Binding a VRF Instance to a vPC 126
Enabling Layer 3 Forwarding to the Gateway MAC Address of the vPC 127
Suspending Orphan Ports on a Secondary Switch in a vPC Topology 127
Creating an EtherChannel Host Interface 129
Moving Other EtherChannels into a vPC 130
Manually Configuring a vPC Domain MAC Address 131
Manually Configuring the System Priority 132
Manually Configuring a vPC Peer Switch Role 133
Verifying the vPC Configuration 134
Viewing The Graceful Type-1 Check Status 135
Viewing A Global Type-1 Inconsistency 135
Viewing An Interface-Specific Type-1 Inconsistency 136
Viewing a Per-VLAN Consistency Status 137
vPC Example Configurations 140
Dual Homed Fabric Extender vPC Configuration Example 140
Single Homed Fabric Extender vPC Configuration Example 142
vPC Default Settings 144
CHAPTER 9 Configuring Rapid PVST+ 145
Information About Rapid PVST+ 145
Understanding STP 145
STP Overview 145
Understanding How a Topology is Created 146
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Understanding the Bridge ID 146
Bridge Priority Value 146
Extended System ID 147
STP MAC Address Allocation 147
Understanding BPDUs 148
Election of the Root Bridge 149
Creating the Spanning Tree Topology 149
Understanding Rapid PVST+ 150
Rapid PVST+ Overview 150
Rapid PVST+ BPDUs 152
Proposal and Agreement Handshake 153
Protocol Timers 154
Port Roles 154
Port States 155
Rapid PVST+ Port State Overview 155
Blocking State 156
Learning State 156
Forwarding State 157
Disabled State 157
Summary of Port States 157
Synchronization of Port Roles 158
Processing Superior BPDU Information 158
Processing Inferior BPDU Information 159
Spanning-Tree Dispute Mechanism 159
Port Cost 159
Port Priority 160
Rapid PVST+ and IEEE 802.1Q Trunks 160
Rapid PVST+ Interoperation with Legacy 802.1D STP 161
Rapid PVST+ Interoperation with 802.1s MST 161
Configuring Rapid PVST+ 161
Enabling Rapid PVST+ 162
Enabling Rapid PVST+ per VLAN 162
Configuring the Root Bridge ID 163
Configuring a Secondary Root Bridge 165
Configuring the Rapid PVST+ Port Priority 165
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Configuring the Rapid PVST+ Pathcost Method and Port Cost 166
Configuring the Rapid PVST+ Bridge Priority of a VLAN 167
Configuring the Rapid PVST+ Hello Time for a VLAN 168
Configuring the Rapid PVST+ Forward Delay Time for a VLAN 169
Configuring the Rapid PVST+ Maximum Age Time for a VLAN 169
Specifying the Link Type 170
Restarting the Protocol 171
Verifying Rapid PVST+ Configurations 171
CHAPTER 10 Configuring Multiple Spanning Tree 173
Information About MST 173
MST Overview 173
MST Regions 174
MST BPDUs 174
MST Configuration Information 175
IST, CIST, and CST 176
IST, CIST, and CST Overview 176
Spanning Tree Operation Within an MST Region 176
Spanning Tree Operations Between MST Regions 177
MST Terminology 178
Hop Count 178
Boundary Ports 178
Spanning-Tree Dispute Mechanism 179
Port Cost and Port Priority 180
Interoperability with IEEE 802.1D 180
Interoperability with Rapid PVST+: Understanding PVST Simulation 181
Configuring MST 181
MST Configuration Guidelines 181
Enabling MST 181
Entering MST Configuration Mode 182
Specifying the MST Name 183
Specifying the MST Configuration Revision Number 184
Specifying the Configuration on an MST Region 185
Mapping and Unmapping VLANs to MST Instances 186
Mapping Secondary VLANs to Same MSTI as Primary VLANs for Private VLANs 187
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Configuring the Root Bridge 188
Configuring a Secondary Root Bridge 189
Configuring the Port Priority 190
Configuring the Port Cost 191
Configuring the Switch Priority 192
Configuring the Hello Time 193
Configuring the Forwarding-Delay Time 194
Configuring the Maximum-Aging Time 194
Configuring the Maximum-Hop Count 195
Configuring PVST Simulation Globally 196
Configuring PVST Simulation Per Port 196
Specifying the Link Type 197
Restarting the Protocol 198
Verifying MST Configurations 199
CHAPTER 11 Configuring STP Extensions 201
About STP Extensions 201
Information About STP Extensions 201
Understanding STP Port Types 201
Spanning Tree Edge Ports 201
Spanning Tree Network Ports 202
Spanning Tree Normal Ports 202
Understanding Bridge Assurance 202
Understanding BPDU Guard 202
Understanding BPDU Filtering 203
Understanding Loop Guard 204
Understanding Root Guard 204
Configuring STP Extensions 205
STP Extensions Configuration Guidelines 205
Configuring Spanning Tree Port Types Globally 205
Configuring Spanning Tree Edge Ports on Specified Interfaces 206
Configuring Spanning Tree Network Ports on Specified Interfaces 207
Enabling BPDU Guard Globally 209
Enabling BPDU Guard on Specified Interfaces 209
Enabling BPDU Filtering Globally 210
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Enabling BPDU Filtering on Specified Interfaces 211
Enabling Loop Guard Globally 212
Enabling Loop Guard or Root Guard on Specified Interfaces 213
Verifying STP Extension Configuration 214
CHAPTER 12 Configuring LLDP 215
Configuring Global LLDP Commands 215
Configuring Interface LLDP Commands 217
CHAPTER 13 Configuring the MAC Address Table 221
Information About MAC Addresses 221
Configuring MAC Addresses 222
Configuring a Static MAC Address 222
Configuring the Aging Time for the MAC Table 222
Clearing Dynamic Addresses from the MAC Table 223
Verifying the MAC Address Configuration 223
CHAPTER 14 Configuring IGMP Snooping 225
Information About IGMP Snooping 225
IGMPv1 and IGMPv2 226
IGMPv3 227
IGMP Snooping Querier 227
IGMP Forwarding 227
Configuring IGMP Snooping Parameters 228
Verifying IGMP Snooping Configuration 230
CHAPTER 15 Configuring Traffic Storm Control 233
Information About Traffic Storm Control 233
Traffic Storm Guidelines and Limitations 234
Configuring Traffic Storm Control 235
Verifying Traffic Storm Control Configuration 236
Traffic Storm Control Example Configuration 236
Default Traffic Storm Settings 236
CHAPTER 16 Configuring the Fabric Extender 237
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Information About the Cisco Nexus 2000 Series Fabric Extender 237
Fabric Extender Terminology 238
Fabric Extender Features 239
Layer 2 Host Interfaces 239
Host Port Channel 240
VLANs 240
Virtual Port Channels 240
Fibre Channel over Ethernet Support 241
Protocol Offload 241
Quality of Service 241
Access Control Lists 242
IGMP Snooping 242
Switched Port Analyzer 242
Fabric Interface Features 243
Oversubscription 243
Management Model 244
Forwarding Model 245
Connection Model 245
Static Pinning Fabric Interface Connection 246
Port Channel Fabric Interface Connection 247
Port Numbering Convention 247
Fabric Extender Image Management 248
Fabric Extender Hardware 248
Chassis 248
Ethernet Interfaces 248
Information About Associating a Fabric Extender to a Fabric Interface 249
Associating a Fabric Extender to an Ethernet Interface 250
Associating a Fabric Extender to a Port Channel 251
Disassociating a Fabric Extender From an Interface 253
Configuring Fabric Extender Global Features 253
Enabling the Fabric Extender Locator LED 255
Redistributing the Links 256
Changing the Number of Links 256
Maintaining the Pinning Order 257
Redistributing Host Interfaces 257
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Verifying the Fabric Extender Configuration 257
Verifying the Chassis Management Information 260
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Preface
This preface describes the audience, organization, and conventions of the Cisco Nexus 5000 Series NX-OS
Layer 2 Switching Configuration Guide. It also provides information on how to obtain related documentation.
•Audience, page xv
•Document Organization, page xv
•Document Conventions, page xvi
•Related Documentation for Nexus 5000 Series NX-OS Software, page xvi
•Obtaining Documentation and Submitting a Service Request, page xviii
Audience
This publication is for experienced network administrators who configure and maintain Cisco NX-OS software.
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 Layer 2 documented features.Overview
Provides information about Ethernet interfaces and describes configuration
procedures.
Configuring Ethernet
Interfaces
Provides details on configuring VLANs.Configuring VLANs
Provides information on configuring private VLANs.Configuring Private VLANs
Provides information about access ports or trunk ports and describes
configuration procedures.
Configuring Access and Trunk
Interfaces
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DescriptionChapter
Provides information about EtherChannels, compatibility requirements,
and configuration information.
Configuring EtherChannels
Provides information about vPCs, domains, guidelines and limitations,
peer links, and configuration information.
Configuring Virtual Port
Channels
Provides information on IEEE 802.1D STP and complete details for
configuring Rapid PVST+.
Configuring Rapid PVST+
Provides complete information on configuring MST.Configuring Multiple Spanning
Tree
Provides details on configuring the Cisco-proprietary STP extensions
Bridge Assurance, BPDU Guard, BPDU Filtering, Loop Guard, Root
Guard, and PVST Simulation.
Configuring STP Extensions
Provides information to configure the Link Layer Discovery Protocol
(LLDP).
Configuring Link Layer
Discovery Protocol
Provides information about MAC addresses, how to configure static MAC
addresses, and how to update the MAC address table.
Configuring the MAC Address
Table
Provides information about IGMPv1, IGMPv2, and IGMPv3 and describes
how to configure IGMP snooping parameters.
Configuring IGMP Snooping
Provides information about traffic storm control, guidelines and
limitations, and how to configure the traffic storm control settings.
Configuring Traffic Storm
Control
Document Conventions
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
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:
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Preface
Document Conventions

Release Notes
•Cisco Nexus 5000 Series and Cisco Nexus 2000 Series Release Notes
•Cisco Nexus 5000 Series Switch Release Notes
Configuration Guides
•Cisco Nexus 5000 Series NX-OS Configuration Limits for Cisco NX-OS Release 5.0(2)N1(1)
•Cisco Nexus 5000 Series NX-OS Configuration Limits for Cisco NX-OS Release 4.2(1)N1(1) and Release
4.2(1)N2(1)
•Cisco Nexus 5000 Series NX-OS Multicast Configuration Guide
•Cisco Nexus 5000 Series NX-OS Unicast Configuration Guide
•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 NX-OS Software Configuration Guide
•Cisco Nexus 5000 Series Fabric Manager Configuration Guide, Release 3.4(1a)
•Cisco Nexus 2000 Series Fabric Extender NX-OS Release 4.2(1) Configuration Guide
Maintain and Operate Guide
•Cisco Nexus 5000 Series Operations Guide
Installation and Upgrade Guides
•Cisco Nexus 5000 Series and Cisco Nexus 5500 Platform Hardware Installation Guide
•Cisco Nexus 5000 Series NX-OS Software Upgrade and Downgrade Guide, Release 4.2(1)N1(1)
•Regulatory Compliance and Safety Information for the Cisco Nexus 5000 Series Switches and Cisco
Nexus 2000 Series Fabric Extenders
Licensing Guide
•Cisco NX-OS Licensing Guide
Command References
•Cisco Nexus 5000 Series Command Reference
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Preface
Related Documentation for Nexus 5000 Series NX-OS Software

Technical References
•Cisco Nexus 5000 Series and Cisco Nexus 2000 Series Fabric Extender MIBs Reference
Error and System Messages
•Cisco NX-OS System Messages Reference
Troubleshooting Guide
•Cisco Nexus 5000 Series Troubleshooting Guide
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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Preface
Obtaining Documentation and Submitting a Service Request

CHAPTER 1
New and Changed Information
This chapter provides release-specific information for each new and changed feature in the Cisco Nexus
5000 Series NX-OS Layer 2 Switching Configuration Guide.
•New and Changed Information, page 1
New and Changed Information
This chapter provides release-specific information for each new and changed feature in the Cisco Nexus 5000
Series NX-OS Layer 2 Switching Configuration Guide.
The latest version of this document is available at the following Cisco website:
http://www.cisco.com/en/US/products/ps9670/products_installation_and_configuration_guides_list.html
To check for additional information about Cisco NX-OS, see the Cisco Nexus 5000 Series NX-OS Release
Notes available at the following Cisco website:
http://www.cisco.com/en/US/products/ps9670/prod_release_notes_list.html
This table summarizes the new and changed features documented in the Cisco Nexus 5000 Series NX-OS
Layer 2 Switching Configuration Guide, Release 5.0(3)N2(1), and tells you where they are documented.
Table 1: New and Changed Layer 2 Switching Features for Cisco NX-OS Release 5.0(3)N2(1)
Where to find it
documented...
Changed in ReleaseDescriptionFeature
Configuring Flex Links5.0(3)N2(1)Added information to
configure flex links on a
pair of Layer 2 interfaces.
Flex Link
Configuring Cisco IP
Phones
5.0(3)N2(1)Added information to
configure Cisco IP
Phones on the Cisco
Nexus 5000 Series
switch.
Cisco IP Phone Support
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Where to find it
documented...
Changed in ReleaseDescriptionFeature
Configuring Virtual Port
Channels
5.0(3)N2(1)Added information to
suspend a non-virtual port
channel (vPC) port when
a vPC secondary peer link
goes down.
Suspending Orphan Ports
Configuring
EtherChannels
5.0(3)N2(1)For Cisco Nexus 5500
Platform switches, added
information to configure
the load balance hash
polynomial.
Configuring Hash
Polynomials
This table summarizes the new and changed features documented in the Cisco Nexus 5000 Series NX-OS
Layer 2 Switching Configuration Guide, Release 5.0(3)N1(1), and tells you where they are documented.
Table 2: New and Changed Layer 2 Switching Features for Cisco NX-OS Release 5.0(3)N1(1)
Where to find it
documented...
Changed in ReleaseDescriptionFeature
Configuring Ethernet
Interfaces
5.0(3)N1(1)Added information to
configure Layer 3
interfaces.
Layer 3 Interfaces
Configuring Virtual Port
Channels
5.0(3)N1(1)Added information to
configure a restore time
delay until a peer
adjacency forms and the
VLAN interfaces are back
up.
Restore Delay Timer
Configuring IGMP
Snooping
5.0(3)N1(1)Added information to
configure a static
connection to a vPC peer
link.
IGMP Snooping
Parameters
Configuring Virtual Port
Channels
5.0(3)N1(1)Added configuration
information to bind a
VRF to a vPC.
Binding a VRF to a vPC
Configuring Virtual Port
Channels
5.0(3)N1(1)Added configuration
information to exclude
specified VLANs from
shutting down when a
vPC peer link fails.
VLAN Interfaces Remain
Up When a vPC Peer
Link Fails
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New and Changed Information
New and Changed Information