Cisco Nexus 7000 Series User manual

Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
First Published: 2016-12-23
Last Modified: 2019-02-19
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CONTENTS
Preface xi
Audience xi
Document Conventions xi
Related Documentation xii
Documentation Feedback xiii
Communications, Services, and Additional Information xiii
New and Changed Information 1
CHAPTER 1
New and Changed Information 1
Overview 3
CHAPTER 2
Information about Multicast 3
Multicast Distribution Trees 4
Source Trees 4
Shared Trees 5
Bidirectional Shared Trees 6
Multicast Forwarding 7
Cisco NX-OS PIM and PIM6 8
ASM 10
Bidir 11
SSM 11
RPF Routes for Multicast 11
IGMP and MLD 11
IGMP Snooping 11
Interdomain Multicast 12
SSM 12
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MSDP 12
MBGP 12
MRIB and M6RIB 12
MRIB/M6RIB Dynamic Shared Memory Support 13
Virtual Port Channels and Multicast 14
Maximum Transmission Unit Limitation 14
Multicasting with both F Series and M Series Modules in a Chassis 14
General Multicast Restrictions 14
Licensing Requirements for Multicast 15
High-Availability Requirements for Multicast 15
Related Documents 15
Technical Assistance 15
Configuring IGMP 17
CHAPTER 3
Information About IGMP 17
IGMP Versions 17
IGMP Basics 18
Virtualization Support 20
IGMP vPC Incremental Sync 20
Licensing Requirements for IGMP 21
Prerequisites for IGMP 21
Default Settings for IGMP 22
Configuring IGMP Parameters 22
Configuring IGMP Interface Parameters 22
Configuring an IGMP SSM Translation 31
Configuring the Enforce Router Alert Option Check 33
Restarting the IGMP Process 33
Verifying the IGMP Configuration 34
Configuration Examples for IGMP 35
Feature History for IGMP 35
Configuring MLD 37
CHAPTER 4
Information About MLD 37
MLD Versions 37
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Contents

MLD Basics 38
Vitualization Support 40
Licensing Requirements for MLD 40
Prerequisites for MLD 40
Guidelines and Limitations for MLD 40
Default Settings for MLD 41
Configuring MLD Parameters 42
Configuring MLD Interface Parameters 42
Configuring an MLD SSM Translation 50
Verifying the MLD Configuration 51
Configuration Examples for MLD 51
Related Documents 52
Standards 52
Feature History for MLD 52
Configuring PIM and PIM6 53
CHAPTER 5
Information About PIM and PIM6 53
Hello Messages 54
Join-Prune Messages 55
State Refreshes 55
Rendezvous Points 55
Static RP 56
BSRs 56
Auto-RP 57
Multiple RPs Configured in a PIM Domain 58
PIM RP versus RP Election Process 61
Anycast-RP 69
PIM Register Messages 69
Designated Routers 70
Designated Forwarders 70
ASM Switchover from Shared Tree to Source Tree 70
ECMP Multicast Load Splitting Based on Source Group and Next-Hop Address Overview 71
Administratively Scoped IP Multicast 72
Bidirectional Forwarding Detection for PIM 72
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Virtualization Support 72
Support for Graceful Restart PIM 72
Prerequisites for Graceful Restart PIM 73
Information About Graceful Restart PIM 73
Additional References for Graceful Restart PIM 75
High Availability 75
Licensing Requirements for PIM and PIM6 75
Prerequisites for PIM and PIM6 75
Guidelines and Limitations for PIM and PIM6 76
Default Settings 77
Configuring PIM and PIM6 78
PIM and PIM6 Configuration Tasks 78
Enabling the PIM and PIM6 Features 79
Configuring PIM or PIM6 Sparse Mode Parameters 80
Configuring PIM Sparse Mode Parameters 82
Configuring PIM6 Sparse Mode Parameters 85
IGMP Querier 87
IGMP Querier Overview 87
Enabling IGMP Querier 87
Example: Enabling IGMP Querier 88
Configuring ASM and Bidir 88
Configuring Static RPs 88
Configuring BSRs 90
Configuring Auto-RP 94
Configuring a PIM Anycast-RP Set 97
Configuring Shared Trees Only for ASM 99
Configuring SSM 101
Configuring SSM (PIM) 101
Configuring SSM (PIM6) 102
Configuring RPF Routes for Multicast 102
Disabling Multicast Multipath 103
Enabling ECMP Multicast Load Splitting Based on Source Group and Next-Hop Address 104
Example: Enabling ECMP Multicast Load Splitting Based on Source Group and Next-Hop
Address 105
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Configuring Route Maps to Control RP Information Distribution 106
Configuring Route Maps to Control RP Information Distribution (PIM) 106
Configuring Route Maps to Control RP Information Distribution (PIM6) 107
Configuring Message Filtering 108
Configuring Message Filtering (PIM) 110
Configuring Message Filtering (PIM6) 111
Restarting the PIM and PIM6 Processes 113
Restarting the PIM Process (PIM) 113
Restarting the PIM6 Process 114
Configuring BFD for PIM in VRF Mode 115
Configuring BFD for PIM in Interface Mode 115
Verifying the PIM and PIM6 Configuration 116
Displaying Statistics 117
Displaying PIM and PIM6 Statistics 117
Clearing PIM and PIM6 Statistics 117
Displaying Replication Engine Statistics 118
Replication Engine Statistics Example 118
Configuration Examples for PIM 120
SSM Configuration Example 120
BSR Configuration Example 120
Auto-RP Configuration Example 121
PIM Anycast RP Configuration Example 122
Prefix-Based and Route-Map-Based Configurations 123
Output 124
Related Documents 125
Standards 125
MIBs 125
Feature History for PIM and PIM6 126
Configuring IGMP Snooping 127
CHAPTER 6
Information About IGMP Snooping 127
IGMPv1 and IGMPv2 128
IGMPv3 129
IGMP Snooping Querier 129
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Static Multicast MAC Address 129
IGMP Snooping with VDCs and VRFs 130
IGMP Snooping across VPLS Domains 130
Licensing Requirements for IGMP Snooping 131
Prerequisites for IGMP Snooping 131
Guidelines and Limitations for IGMP Snooping 131
Default Settings for IGMP Snooping 132
Configuring IGMP Snooping Parameters 133
Configuring Global IGMP Snooping Parameters 133
Configuring IGMP Snooping Parameters per VLAN 137
Changing the Lookup Mode 150
Configuring a Static Multicast MAC Address 152
Verifying IGMP Snooping Configuration 153
Displaying IGMP Snooping Statistics 153
Configuration Example for IGMP Snooping 153
Related Documents 154
Standards 155
Feature History for IGMP Snooping in CLI 155
Configuring MSDP 157
CHAPTER 7
Information About MSDP 157
SA Messages and Caching 158
MSDP Peer-RPF Forwarding 159
MSDP Mesh Groups 159
Virtualization Support 159
Licensing Requirements for MSDP 160
Prerequisites for MSDP 160
Default Settings for MSDP 160
Configuring MSDP 161
Enabling the MSDP Feature 161
Configuring MSDP Peers 162
Configuring MSDP Peer Parameters 163
Configuring MSDP Global Parameters 165
Configuring MSDP Mesh Groups 167
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Restarting the MSDP Process 168
Verifying the MSDP Configuration 169
Monitoring MSDP 169
Displaying Statistics 170
Clearing Statistics 170
Configuration Examples for MSDP 170
Related Documents 171
Standards 172
Configuring Multicast Extranet 173
CHAPTER 8
Information About Configuring Multicast Extranet 173
Components of Multicast Extranet 174
Guidelines and Limitations for Configuring Multicast Extranet 175
How to Configure Multicast Extranet 175
Configuring Multicast Extranet 175
Additional References for Configuring Multicast Extranet 177
Feature Information for Configuring Multicast Extranet 177
Configuring MoFRR 179
CHAPTER 9
Configuring MoFRR 179
Information about MoFRR 179
Prerequisites for MoFRR 181
Guidelines and Restrictions for MoFRR 181
Configuring MoFRR 181
Verifying Configuring MoFRR 182
Troubleshooting 183
Feature Information for Configuring MoFRR 183
Enabling Multicast Performance Enhancement on VDCs 185
CHAPTER 10
Information About Multicast Performance Enhancement 185
Licensing Requirements for Multicast Performance Enhancement 185
Guidelines and Limitations for Enhanced Multicast Performance 186
Enabling Multicast Performance Enhancement 186
Related Documents for Multicast Performance Enhancement 187
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Feature History for Multicast Performance Enhancement 187
Configuring Multicast Interoperation with N7K-F132-15 Modules 189
CHAPTER 11
Information About Multicast Interoperation 189
Multicast Interoperation with N7K-F132-15 and M-Series Modules 189
Virtualization Support 190
High Availability 190
Licensing Requirements for Multicast Interoperation 190
Prerequisites for Multicast Interoperation 191
Guidelines and Limitations 191
Configuring Layer 3 Multicast Using a Mixed Chassis 191
Verifying the Multicast Configuration 193
Feature History for Multicast Interoperation 193
IETF RFCs for IP Multicast 195
APPENDIX A
IETF RFCs for IP Multicast 195
Configuration Limits for Cisco NX-OS Multicast 197
APPENDIX B
Configuration Limits 197
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Contents

Preface
This preface describes the audience, organization, and conventions of the Book Title. It also provides
information on how to obtain related documentation.
This chapter includes the following topics:
Audience
This publication is for experienced network administrators who configure and maintain Cisco NX-OS on
Cisco Nexus 7000 Series Platform switches.
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.
• The Guidelines and Limitations section contains general guidelines and limitations that are applicable
to all the features, and the feature-specific guidelines and limitations that are applicable only to the
corresponding feature.
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]
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
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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DescriptionConvention
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
Related Documentation
Documentation for Cisco Nexus 7000 Series Switches is available at:
• Configuration Guides
http://www.cisco.com/c/en/us/support/switches/nexus-7000-series-switches/
products-installation-and-configuration-guides-list.html
• Command Reference Guides
http://www.cisco.com/c/en/us/support/switches/nexus-7000-series-switches/
products-command-reference-list.html
• Release Notes
http://www.cisco.com/c/en/us/support/switches/nexus-7000-series-switches/products-release-notes-list.html
• Install and Upgrade Guides
http://www.cisco.com/c/en/us/support/switches/nexus-7000-series-switches/
products-installation-guides-list.html
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
xii
Preface
Related Documentation

• Licensing Guide
http://www.cisco.com/c/en/us/support/switches/nexus-7000-series-switches/
products-licensing-information-listing.html
Documentation for Cisco Nexus 7000 Series Switches and Cisco Nexus 2000 Series Fabric Extenders is
available at the following URL:
http://www.cisco.com/c/en/us/support/switches/nexus-2000-series-fabric-extenders/
products-installation-and-configuration-guides-list.html
Documentation Feedback
To provide technical feedback on this document, or to report an error or omission, please send your comments
to [email protected]. We appreciate your feedback.
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Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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Preface
Documentation Feedback

Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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Preface
Communications, Services, and Additional Information

CHAPTER 1
New and Changed Information
This chapter describes new and changed features.
•New and Changed Information, on page 1
New and Changed Information
The table below summarizes the new and changed features for this document and shows the releases in which
each feature is supported. Your software release might not support all the features in this document. For the
latest caveats and feature information, see the Bug Search Tool at https://tools.cisco.com/bugsearch/ and the
release notes for your software release.
Table 1: New and Changed Information for Multicast Routing
Where DocumentedChanged in ReleaseDescriptionFeature
Configuring MoFRR, on
page 179
8.2(1)Introduced this feature.Configuring MoFRR
Configuring Multicast
Extranet, on page 173
8.2(1)Introduced this feature.Configuring Multicast
Extranet
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Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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New and Changed Information
New and Changed Information

CHAPTER 2
Overview
This chapter describes the multicast features of Cisco NX-OS.
•Information About Multicast, on page 3
•General Multicast Restrictions, on page 14
•Licensing Requirements for Multicast, on page 15
•High-Availability Requirements for Multicast, on page 15
•Related Documents, on page 15
•Technical Assistance, on page 15
Information About Multicast
IP multicast is a method of forwarding the same set of IP packets to a number of hosts within a network. You
can use multicast in both IPv4 and IPv6 networks to provide efficient delivery of data to multiple destinations.
Beginning with Cisco NX-OS Release 5.2(1) for the Nexus 7000 Series devices, you can configure
Protocol-Independent Multicast v4 (PIMv4) to run over generic routing encapsulation (GRE) tunnels including
outgoing interfaces (OIF). In prior Cisco NX-OS releases, tunnel interfaces do not support PIM.
Note
Beginning with Cisco NX-OS Release 7.3(0)DX(1), multicast generic routing encapsulation (mGRE) tunnels
is supported on M3 Series modules.
Note
Multicast involves both a method of delivery and discovery of senders and receivers of multicast data, which
is transmitted on IP multicast addresses called groups. A multicast address that includes a group and source
IP address is often referred to as a channel. The Internet Assigned Number Authority (IANA) has assigned
224.0.0.0 through 239.255.255.255 as IPv4 multicast addresses. For more information, see
http://www.iana.org/assignments/multicast-addresses.
IPv6 multicast addresses begin with 0xFF. The IPv6 addressing architecture is defined by RFC 4291. For
more information about the IANA reserved addresses, see
http://www.iana.org/assignments/ipv6-multicast-addresses.
Cisco Nexus 7000 Series NX-OS Multicast Routing Configuration Guide
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For a complete list of RFCs related to multicast, see Appendix A, “IETF RFCs for IP Multicast.”
Note
The routers in the network listen for receivers to advertise their interest in receiving multicast data from
selected groups. The routers then replicate and forward the data from sources to the interested receivers.
Multicast data for a group is transmitted only to those LAN segments with receivers that requested it.
This figure shows one source transmitting multicast data that is delivered to two receivers. In the figure,
because the center host is on a LAN segment where no receiver requested multicast data, no data is delivered
to that receiver.
Figure 1: Multicast Traffic from One Source to Two Receivers
Multicast Distribution Trees
A multicast distribution tree represents the path that multicast data takes between the routers that connect
sources and receivers. The multicast software builds different types of trees to support different multicast
methods.
Source Trees
A source tree represents the shortest path that the multicast traffic takes through the network from the sources
that transmit to a particular multicast group to receivers that requested traffic from that same group. Because
of the shortest path characteristic of a source tree, this tree is often referred to as a shortest path tree (SPT).
This figure shows a source tree for group 224.1.1.1 that begins at host A and connects to hosts B and C.
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Overview
Multicast Distribution Trees

Figure 2: Source Tree
The notation (S, G) represents the multicast traffic from source S on group G. The SPT in this figure is written
(192.0.2.1, 224.1.1.1). Multiple sources can be transmitting on the same group.
Shared Trees
A shared tree represents the shared distribution path that the multicast traffic takes through the network from
a shared root or rendezvous point (RP) to each receiver. (The RP creates an SPT to each source.) A shared
tree is also called an RP tree (RPT). The figure below shows a shared tree for group 224.1.1.1 with the RP at
router D. Source hosts A and D send their data to router D, the RP, which then forwards the traffic to receiver
hosts B and C.
The notation (*, G) represents the multicast traffic from any source on group G. The shared tree in this figure
is written (*, 224.2.2.2).
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Overview
Shared Trees

Figure 3: Shared Tree
Bidirectional Shared Trees
A bidirectional shared tree represents the shared distribution path that the multicast traffic takes through the
network from a shared root, or rendezvous point (RP), to each receiver. Multicast data is forwarded to receivers
encountered on the way to the RP. The advantage of the bidirectional shared tree is shown in the figure below.
Multicast traffic flows directly from host A to host B through routers B and C. In a shared tree, the data from
source host A is first sent to the RP (router D) and then forwarded to router B for delivery to host B.
The notation (*, G) represents the multicast traffic from any source on group G. The bidirectional tree in the
figure below is written (*, 224.2.2.2).
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Overview
Bidirectional Shared Trees