Cisco 7206 - VXR Router User manual

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Cisco Nexus 7000 Series NX-OS Interfaces
Configuration Guide, Release 5.x
September 5, 2012
Text Part Number: OL-23435-03

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Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
© 2009—2011 Cisco Systems, Inc. All rights reserved.

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CONTENTS
New and Changed Information -xiii
Preface xv
Audience xv
Document Organization xv
Document Conventions -xvi
Obtaining Documentation and Submitting a Service Request xvii
xvii
CHAPTER 1Overview 1-1
Information About Interfaces 1-1
Ethernet Interfaces 1-2
Management Interface 1-3
Port-Channel Interfaces 1-4
vPCs 1-4
Subinterfaces 1-4
VLAN Network Interfaces 1-4
Loopback Interfaces 1-4
Tunnel Interfaces 1-4
Virtualization Interfaces 1-5
High Availability for Interfaces 1-5
Licensing Requirements for Interfaces 1-5
CHAPTER 2Configuring Basic Interface Parameters 2-1
Information About the Basic Interface Parameters 2-2
Description 2-2
Beacon 2-2
MDIX 2-3
Debounce Timer 2-3
Error Disabled 2-3
Rate Mode 2-4
Speed Mode and Duplex Mode 2-4
Flow Control 2-5
Port MTU Size 2-6

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Contents
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Bandwidth 2-7
Throughput Delay 2-7
Administrative Status 2-7
Unidirectional Link Detection Parameter 2-7
Carrier Delay 2-10
Port-Channel Parameters 2-10
Port Profiles 2-10
Time Domain Reflectometry Cable Diagnostics 2-12
Licensing Requirements 2-12
Guidelines and Limitations 2-13
Default Settings 2-14
Configuring the Basic Interface Parameters 2-14
Specifying the Interfaces to Configure 2-15
Configuring the Description 2-16
Configuring the Beacon Mode 2-17
Changing the Bandwidth-Rate Mode 2-19
Configuring the Error-Disabled State 2-22
Configuring the MDIX Parameter 2-25
Configuring the Debounce Timer 2-26
Configuring the Interface Speed and Duplex Mode 2-28
Configuring the Flow Control 2-30
Configuring the MTU Size 2-31
Configuring the Bandwidth 2-34
Configuring the Throughput Delay 2-36
Shutting Down and Activating the Interface 2-37
Configuring the UDLD Mode 2-39
Configuring the Carrier Delay Timer 2-41
Configuring Port Profiles 2-43
Performing TDR Cable Diagnostics 2-51
Configuring Rate Limits for Packets that Reach the Supervisor 2-52
Verifying the Basic Interface Parameters 2-54
Monitoring the Interface Counters 2-54
Displaying Interface Statistics 2-54
Clearing Interface Counters 2-56
Additional References 2-56
Related Documents 2-57
Standards 2-57
Feature History for Configuring Basic Interface Parameters 2-57

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Contents
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CHAPTER 3Configuring Layer 2 Interfaces 3-1
Information About Access and Trunk Interfaces 3-2
Information About Access and Trunk Interfaces 3-3
IEEE 802.1Q Encapsulation 3-4
Access VLANs 3-5
Native VLAN IDs for Trunk Ports 3-6
Tagging Native VLAN Traffic 3-6
Allowed VLANs 3-6
High Availability 3-7
Virtualization Support 3-7
Default Interfaces 3-7
SVI Autostate Exclude 3-7
Licensing Requirements for Layer 2 Port Modes 3-8
Prerequisites for Layer 2 Interfaces 3-8
Guidelines and Limitations 3-8
Default Settings 3-9
Configuring Access and Trunk Interfaces 3-9
Guidelines for Configuring Access and Trunk Interfaces 3-10
Configuring a LAN Interface as a Layer 2 Access Port 3-10
Configuring Access Host Ports 3-11
Configuring Trunk Ports 3-13
Configuring the Native VLAN for 802.1Q Trunking Ports 3-14
Configuring the Allowed VLANs for Trunking Ports 3-16
Configuring a Default Interface 3-17
Configuring SVI Autostate Exclude 3-18
Configuring the Device to Tag Native VLAN Traffic 3-20
Changing the System Default Port Mode to Layer 2 3-21
Verifying the Interface Configuration 3-22
Monitoring the Layer 2 Interfaces 3-23
Example Configurations for Access and Trunk Ports 3-23
Additional References 3-24
Related Documents 3-24
Standards 3-24
MIBs 3-25
Feature History for Configuring Layer 2 Interfaces 3-25
CHAPTER 4Configuring Layer 3 Interfaces 4-1
Information About Layer 3 Interfaces 4-1

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Routed Interfaces 4-2
Subinterfaces 4-2
VLAN Interfaces 4-3
Loopback Interfaces 4-4
Tunnel Interfaces 4-4
High Availability 4-4
Virtualization Support 4-5
Licensing Requirements for Layer 3 Interfaces 4-5
Prerequisites for Layer 3 Interfaces 4-5
Guidelines and Limitations 4-5
Default Settings 4-6
Configuring Layer 3 Interfaces 4-6
Configuring a Routed Interface 4-6
Configuring a Subinterface 4-8
Configuring the Bandwidth on an Interface 4-10
Configuring a VLAN interface 4-10
Configuring Inband Management in the Nexus Chassis 4-13
Configuring a Loopback Interface 4-15
Assigning an Interface to a VRF 4-16
Verifying the Layer 3 Interfaces Configuration 4-17
Monitoring Layer 3 Interfaces 4-18
Configuration Examples for Layer 3 Interfaces 4-19
Related Topics 4-19
Additional References 4-19
Related Documents 4-20
MIBs 4-20
Standards 4-20
Feature History for Configuring Layer 3 Interfaces 4-20
CHAPTER 5Configuring Bidirectional Forwarding Detection 5-1
Information About BFD 5-1
Asynchronous Mode 5-2
BFD Detection of Failures 5-2
Distributed Operation 5-3
BFD Echo Function 5-3
Security 5-4
High Availability 5-4
Virtualization Support 5-4

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Licensing Requirements for BFD 5-4
Prerequisites for BFD 5-4
Guidelines and Limitations 5-5
Default Settings 5-6
Configuring BFD 5-6
Configuration Hierarchy 5-7
Task Flow for Configuring BFD 5-7
Enabling the BFD Feature 5-7
Configuring Global BFD Parameters 5-8
Configuring BFD on an Interface 5-9
Configuring BFD on a Port Channel 5-11
Configuring BFD Echo Function 5-12
Optimizing BFD on Subinterfaces 5-13
Configuring BFD Support for Routing Protocols 5-14
Verifying the BFD Configuration 5-25
Monitoring BFD 5-25
Configuration Examples for BFD 5-26
Additional References 5-26
Related Documents 5-27
RFCs 5-27
Feature History for BFD 5-27
CHAPTER 6Configuring Port Channels 6-1
Information About Port Channels 6-1
Port Channels 6-3
Port-Channel Interfaces 6-3
Basic Settings 6-4
Compatibility Requirements 6-5
Load Balancing Using Port Channels 6-6
LACP 6-8
Virtualization Support 6-13
High Availability 6-13
Licensing Requirements for Port Channeling 6-14
Prerequisites for Port Channeling 6-14
Guidelines and Limitations 6-14
Default Settings 6-15
Configuring Port Channels 6-15
Creating a Port Channel 6-16

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Adding a Layer 2 Port to a Port Channel 6-17
Adding a Layer 3 Port to a Port Channel 6-19
Configuring the Bandwidth and Delay for Informational Purposes 6-21
Shutting Down and Restarting the Port-Channel Interface 6-22
Configuring a Port-Channel Description 6-24
Configuring the Speed and Duplex Settings for a Port-Channel Interface 6-25
Configuring Flow Control 6-26
Configuring Load Balancing Using Port Channels 6-27
Enabling LACP 6-29
Configuring LACP Port-Channel Port Modes 6-30
Configuring LACP Port-Channel MinLinks 6-31
Configuring the LACP Port-Channel MaxBundle 6-32
Configuring the LACP Fast Timer Rate 6-34
Configuring the LACP System Priority 6-34
Configuring the LACP Port Priority 6-35
Disabling LACP Graceful Convergence 6-36
Disabling LACP Suspend Individual 6-39
Reenabling LACP Suspend Individual 6-40
Verifying the Port-Channel Configuration 6-42
Monitoring the Port-Channel Interface Configuration 6-43
Example Configurations for Port Channels 6-43
Additional References 6-44
Related Documents 6-45
Standards 6-45
MIBs 6-45
Feature History for Configuring Port Channels 6-45
CHAPTER 7Configuring vPCs 7-1
Information About vPCs 7-2
vPC Overview 7-2
vPC Terminology 7-5
vPC Peer Links 7-6
Peer-Keepalive Link and Messages 7-11
vPC Peer-Gateway 7-12
vPC Domain 7-13
vPC Topology 7-14
Compatibility Parameters for vPC Interfaces 7-15
vPC Number 7-18
Moving Other Port Channels into a vPC 7-18

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Contents
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Configuring vPC Peer Links and Links to the Core on a Single Module 7-19
vPC Interactions with Other Features 7-20
Virtualization Support 7-27
vPC Recovery After an Outage 7-27
High Availability 7-28
Licensing Requirements for vPCs 7-29
Guidelines and Limitations 7-29
Default Settings 7-30
Configuring vPCs 7-30
Enabling vPCs 7-31
Disabling vPCs 7-32
Creating a vPC Domain and Entering the vpc-domain Mode 7-33
Configuring the vPC Keepalive Link and Messages 7-34
Creating the vPC Peer Link 7-36
Configuring the vPC Peer-Gateway 7-38
Configuring a Graceful Consistency Check 7-39
Checking the Configuration Compatibility on a vPC Peer Link 7-40
Moving Other Port Channels into a vPC 7-41
Manually Configuring a vPC Domain MAC Address 7-42
Manually Configuring the System Priority 7-44
Manually Configuring the vPC Peer Device Role 7-45
Configuring the Tracking Feature on a Single-Module vPC 7-46
Configuring for Recovery After an Outage 7-48
Configuring the Suspension of Orphan Ports 7-52
Configuring the vPC Peer Switch 7-53
Verifying the vPC Configuration 7-56
Monitoring vPCs 7-57
Configuration Examples for vPCs 7-57
Additional References 7-59
Related Documents 7-60
Standards 7-60
MIBs 7-60
Feature History for Configuring vPCs 7-60
CHAPTER 8Configuring IP Tunnels 8-1
Information About IP Tunnels 8-1
IP Tunnel Overview 8-1
GRE Tunnels 8-2

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Path MTU Discovery 8-3
Virtualization Support 8-3
High Availability 8-3
Licensing Requirements for IP Tunnels 8-3
Prerequisites for IP Tunnels 8-4
Guidelines and Limitations 8-4
Default Settings 8-4
Configuring IP Tunnels 8-4
Enabling Tunneling 8-5
Creating a Tunnel Interface 8-5
Configuring a GRE Tunnel 8-7
Enabling Path MTU Discovery 8-8
Assigning VRF Membership to a Tunnel Interface 8-8
Verifying the IP Tunnel Configuration 8-10
Configuration Examples for IP Tunneling 8-10
Additional References 8-11
Related Documents 8-11
Standards 8-11
Feature History for Configuring IP Tunnels 8-11
CHAPTER 9Configuring Q-in-Q VLAN Tunnels 9-1
Information About Q-in-Q Tunnels 9-1
Q-in-Q Tunneling 9-1
Native VLAN Hazard 9-3
Information About Layer 2 Protocol Tunneling 9-4
Licensing Requirements for Q-in-Q Tunnels 9-7
Guidelines and Limitations 9-7
Configuring Q-in-Q Tunnels and Layer 2 Protocol Tunneling 9-7
Creating a 802.1Q Tunnel Port 9-8
Changing the EtherType for Q-in-Q 9-9
Enabling the Layer 2 Protocol Tunnel 9-11
Configuring Global CoS for L2 Protocol Tunnel Ports 9-12
Configuring the Rate Limit for Layer 2 Protocol Tunnel Ports 9-13
Configuring Thresholds for Layer 2 Protocol Tunnel Ports 9-14
Verifying the Q-in-Q Configuration 9-16
Configuration Examples for Q-in-Q and Layer 2 Protocol Tunneling 9-16
Feature History for Q-in-Q Tunnels and Layer 2 Protocol Tunneling 9-17