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
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Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
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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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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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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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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

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APPENDIX AIETF RFCs supported by Cisco NX-OS Interfaces A-1
IPv6 RFCs A-1
APPENDIX BConfiguration Limits for Cisco NX-OS Interfaces B-1
I NDEX

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New and Changed Information
This chapter provides release-specific information for each new and changed feature in the Cisco Nexus
7000 Series NX-OS Interfaces Configuration Guide, Release 5.x. The latest version of this document is
available at the following Cisco website:
http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/interfaces/configuration/guide/if_
cli.html
To check for additional information about Cisco NX--OS Release 5.x, see the Cisco Nexus 7000 Series
NX-OS Release Notes, Release 5.x. Release notes are available at the following Cisco website:
http://www.cisco.com/en/US/products/ps9402/prod_release_notes_list.html
Table 1 summarizes the new and changed features for the Cisco Nexus 7000 Series NX-OS Interfaces
Configuration Guide, Release 5.x, and tells you where they are documented.
Table 1 New and Changed Features for Cisco NX--OS Release 5.x
Feature Description
Changed in
Release Where Documented
Fabric Extender (FEX) Fabric Extender ports have Layer 3 support for
host connectivity, and vPCs can be configured
through Fabric Extenders (Host vPC).
5.2(1) Chapter 4, “Configuring Layer 3
Interfaces”
Chapter 7, “Configuring vPCs”
BFD SHA1
Authentication
Supports SHA-1 authentication of BFD
packets.
5.2(1) Chapter 5, “Configuring
Bidirectional Forwarding
Detection”
Default Interfaces Allows you to clear the existing configuration
of multiple interface types.
5.2(1) Chapter 3, “Configuring Layer 2
Interfaces”
SVI Autostate Exclude Allows you to exclude a port from the VLAN
interface link-up calculation when there are
multiple ports in the VLAN.
5.2(1) Chapter 3, “Configuring Layer 2
Interfaces”
vPC Allows you to configure auto recovery
configuration support, provides system display
of MST to VLAN consistency failures,
provides FabricPath configuration support,
and vPC connection to Cisco 2000 Series
Fabric Extenders.
5.2(1) Chapter 7, “Configuring vPCs”
Rate Limits Configures rate limits for packets that reach
the supervisor.
5.1(1) Chapter 2, “Configuring Basic
Interface Parameters”

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New and Changed Information
Inband Management in
the Nexus Chassis
Configures inband management in the Cisco
Nexus 7000 switches when there are only F1
series module in the chassis.
5.1(1) Chapter 4, “Configuring Layer 3
Interfaces”
F1 series modules and M1
series modules for the
port channel
Supports bundling of 16 active ports
simultaneously into a port channel on the F
series module. On the M Series module, you
can bundle up to 8 active and 8 standby.
5.1(1) Chapter 6, “Configuring Port
Channels”
LACP Port-Channel
MinLinks and
MaxBundle
Configures LACP port-channel minlinks and
LACP port-channel maxbundle.
5.1(1) Chapter 6, “Configuring Port
Channels”
BFD Makes network profiling and planning easier
and reconvergence time consistent and
predictable.
5.0(2) Chapter 5, “Configuring
Bidirectional Forwarding
Detection”
Q-in-Q Tunneling Enables the segregation of traffic for different
customers while still giving you a full range of
VLANs for your use.
5.0(2) Chapter 9, “Configuring Q-in-Q
VLAN Tunnels”
vPC and STP
Convergence
Supports bringing up the vPC on a switch
when its peer fails to function. Enables the
vPC switch pair to appear as a single STP root
in the Layer 2 topology.
5.0(2) Chapter 7, “Configuring vPCs”
Table 1 New and Changed Features for Cisco NX--OS Release 5.x (continued)
Feature Description
Changed in
Release Where Documented

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Preface
This preface describes the audience, organization and conventions of the Cisco Nexus 7000 Series
NX-OS Interfaces Configuration Guide, Release 5.x. It also provides information on how to obtain
related documentation.
Audience
This publication is for experienced network administrators who configure and maintain Cisco NX-OS
devices.
Document Organization
This document is organized into the following chapters:
Chapter Description
Chapter 1, “Overview” Provides an overview of the Cisco NX-OS
interfaces.
Chapter 2, “Configuring Basic Interface
Parameters”
Describes how you can configure the basic
parameters shared by Layer 2 and Layer 3
interfaces.
Chapter 3, “Configuring Layer 2 Interfaces” Describes how to configure Layer 2 switching
ports as access or trunk ports.
Chapter 4, “Configuring Layer 3 Interfaces” Describes how to configure Layer 3 interfaces.
Chapter 5, “Configuring Bidirectional
Forwarding Detection”
Describes how to configure Bidirectional
Forwarding Detection (BFD) to provide fast
forwarding-path failure detection times for media
types, encapsulations, topologies, and routing
protocols..
Chapter 6, “Configuring Port Channels” Describes how to configure port channels and to
apply and configure the Link Aggregation Control
Protocol (LACP) for a more efficient use of port
channels.
Chapter 7, “Configuring vPCs” Describes how to configure virtual port channels
(vPCs).

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Preface
Document Conventions
Document Conventions
Command descriptions use these conventions:
Screen examples use these conventions:
This document uses the following conventions:
Note Means reader take note. Notes contain helpful suggestions or references to material not covered in the
manual.
Chapter 8, “Configuring IP Tunnels” Describes how to configure IP tunnels using
Generic Route Encapsulation (GRE) on the
device.
Chapter 9, “Configuring Q-in-Q VLAN Tunnels” Describes how to configure IEEE 802.1Q-in-Q
(Q-in-Q) VLAN tunnels and Layer 2 protocol
tunneling.
Chapter A, “IETF RFCs supported by Cisco
NX-OS Interfaces”
lists the IETF RFCs for interfaces supported in
Cisco NX-OS Release 4.x
Chapter B, “Configuration Limits for Cisco
NX-OS Interfaces”
Lists the Cisco verified limits and maximum
limits for devices running NX-OS Release 4.x.
Chapter Description
Convention Description
boldface font Commands and keywords are in boldface.
italic font Arguments for which you supply values are in italics.
[ ] Elements in square brackets are optional.
[ x | y | z ] Optional alternative keywords are grouped in brackets and separated by vertical
bars.
string A nonquoted set of characters. Do not use quotation marks around the string or
the string will include the quotation marks.
screen font Terminal sessions and information that the switch displays are in screen font.
boldface screen
font
Information that you must enter is in boldface screen font.
italic screen font Arguments for which you supply values are in 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.

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Preface
Document Conventions
Caution Means reader be careful. In this situation, you might do something that could result in equipment
damage or loss of data.
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 an RSS feed and set content to be
delivered directly to your desktop using a reader application. The RSS feeds are a free service. Cisco currently
supports RSS Version 2.0.

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Preface
Document Conventions

CHAPTER
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1
Overview
This chapter provides an overview of the interface types supported by the Cisco NX-OS software.
This chapter includes the following sections:
•Information About Interfaces, page 1-1
•Virtualization Interfaces, page 1-5
•High Availability for Interfaces, page 1-5
•Licensing Requirements for Interfaces, page 1-5
Information About Interfaces
Cisco NX-OS supports multiple configuration parameters for each of the interface types supported. Most
of these parameters are covered in this guide but some are described in other documents.
Table 1-1 shows where to get further information on the parameters you can configure for an interface.
Table 1-1 Interface Parameters
Feature Parameters Further Information
Basic
parameters
description, duplex, error
disable, flow control, MTU,
beacon
Chapter 2, “Configuring Basic Interface
Parameters” of this document
Layer 2 Layer 2 access and trunk port
settings
Chapter 3, “Configuring Layer 2 Interfaces” of
this document
Layer 2 MAC, VLANs, private
VLANs, Rapid PVST+, Multiple
Spanning Tree, Spanning Tree
Extensions
Cisco Nexus 7000 Series NX-OS Layer 2
Switching Configuration Guide, Release 5.x
Port security Cisco Nexus 7000 Series NX-OS Security
Configuration Guide, Release 5.x

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Chapter 1 Overview
Information About Interfaces
This section includes the following topics:
•Ethernet Interfaces, page 1-2
•Management Interface, page 1-3
•Port-Channel Interfaces, page 1-4
•vPCs, page 1-4
•Subinterfaces, page 1-4
•VLAN Network Interfaces, page 1-4
•Loopback Interfaces, page 1-4
•Tunnel Interfaces, page 1-4
Ethernet Interfaces
Ethernet interfaces include access ports, trunk ports, private VLAN hosts and promiscuous ports, and
routed ports.
This section includes the following topics:
•Access Ports, page 1-3
•Trunk Ports, page 1-3
•Private VLAN Hosts and Promiscuous Ports, page 1-3
•Routed Ports, page 1-3
Layer 3 medium, IPv4 and IPv6
addresses
Chapter 4, “Configuring Layer 3 Interfaces” of
this document
bandwidth, delay, IP routing,
VRFs
Cisco Nexus 7000 Series NX-OS Unicast Routing
Configuration Guide, Release 5.x
Cisco Nexus 7000 Series NX-OS Multicast
Routing Configuration Guide, Release 5.x
Port Channels channel group, LACP Chapter 6, “Configuring Port Channels” of this
document
vPCs Virtual port channels Chapter 7, “Configuring vPCs” of this document
Tunnels GRE Tunneling Chapter 8, “Configuring IP Tunnels” of this
document
Security Dot1X, NAC, EOU, port security Cisco Nexus 7000 Series NX-OS Security
Configuration Guide, Release 5.x
FCoE Beginning with Cisco NX-OS
Release 5.2(1), you can run Fibre
Channel over Ethernet (FCoE) on
the Cisco Nexus 7000 Series
Switch
Cisco NX-OS FCoE Configuration Guide for
Cisco Nexus 7000 and Cisco MDS 9500
Table 1-1 Interface Parameters (continued)
Feature Parameters Further Information