Juniper JUNOSE 11.2.X MULTICAST ROUTING Configuration Manual

JunosE™ Software for E Series™ Broadband Services Routers

Multicast Routing Configuration Guide

Release

11.2.x

Published: 2010-06-29

Juniper Networks, Inc. 1194 North Mathilda Avenue Sunnyvale, California 94089 USA 408-745-2000 www.juniper.net

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Juniper Networks assumes no responsibility for any inaccuracies in this document. Juniper Networks reserves the right to change, modify, transfer, or otherwise revise this publication without notice.

Products made or sold by Juniper Networks or components thereof might be covered by one or more of the following patents that are owned by or licensed to Juniper Networks: U.S. Patent Nos. 5,473,599, 5,905,725, 5,909,440, 6,192,051, 6,333,650, 6,359,479, 6,406,312, 6,429,706, 6,459,579, 6,493,347, 6,538,518, 6,538,899, 6,552,918, 6,567,902, 6,578,186, and 6,590,785.

JunosE™ Software for E Series™ Broadband Services Routers Multicast Routing Configuration Guide

Writing: Mark Barnard, Diane Florio, Bruce Gillham, Sarah Lesway-Ball, Brian Wesley Simmons, Fran Singer, Sairam Venugopalan Editing: Benjamin Mann Illustration: Nathaniel Woodward Cover Design: Edmonds Design

Revision History July 2010—FRS JunosE 11.2.x

The information in this document is current as of the date listed in the revision history.

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Juniper Networks hardware and software products are Year 2000 compliant. The Junos OS has no known time-related limitations through the year 2038. However, the NTP application is known to have some difficulty in the year 2036.

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Abbreviated Table of Contents

About the Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix

Part 1 Internet Protocol Version 4

Chapter 1 Configuring IPv4 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Chapter 2 Configuring IGMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Chapter 3 Configuring PIM for IPv4 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Chapter 4 Configuring DVMRP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Part 2 Internet Protocol Version 6

Chapter 5 Configuring IPv6 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Chapter 6 Configuring Multicast Listener Discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Chapter 7 Configuring PIM for IPv6 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Part 3 Index

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

JunosE 11.2.x Multicast Routing Configuration Guide

Table of Contents

About the Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix

E Series and JunosE Documentation and Release Notes . . . . . . . . . . . . . . . . . . . . xix

Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix

E Series and JunosE Text and Syntax Conventions . . . . . . . . . . . . . . . . . . . . . . . . xix

Obtaining Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

Documentation Feedback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

Requesting Technical Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi

Self-Help Online Tools and Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii

Opening a Case with JTAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii

Part 1 Internet Protocol Version 4

Chapter 1 Configuring IPv4 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

IPv4 Multicast Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Reverse-Path Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Multicast Packet Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Platform Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Configuring the Switch Fabric Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Enabling IP Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Defining Static Routes for Reverse-Path Forwarding . . . . . . . . . . . . . . . . . . . . . . . . 7

Displaying Available Routes for Reverse-Path Forwarding . . . . . . . . . . . . . . . . . . . . 7

Enabling and Disabling RPF Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Using Unicast Routes for RPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Defining Permanent IP Multicast Forwarding Entries . . . . . . . . . . . . . . . . . . . . . . . 10

Defining a Multicast Bandwidth Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Using the Autosense Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

How Adaptive Mode Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Multicast Bandwidth Map Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Configuring Multicast QoS Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Multicast OIF Mapping Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Multicast Traffic Receipt Without Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . 16

Activating Multicast QoS Adjustment Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Configuring Hardware Multicast Packet Replication . . . . . . . . . . . . . . . . . . . . . . . . 17

Supported Modules and Encapsulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Relationship with OIF Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Hardware Multicast Packet Replication Considerations . . . . . . . . . . . . . . . . . 21

Configuring Hardware Multicast Packet Replication . . . . . . . . . . . . . . . . . . . . 22

JunosE 11.2.x Multicast Routing Configuration Guide

Monitoring Hardware Multicast Packet Replication . . . . . . . . . . . . . . . . . . . . 24

Port Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

IP and VLAN Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

IGMP Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Blocking and Limiting Multicast Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Blocking Mroutes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Limiting Interface Admission Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Enabling Interface Admission Bandwidth Limitation . . . . . . . . . . . . . . . . 26

OIF Interface Reevaluation Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Creating Mroute Port Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Limiting Port Admission Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Enabling Port Admission Bandwidth Control . . . . . . . . . . . . . . . . . . . . . . 27

OIF Port Reevaluation Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Deleting Multicast Forwarding Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Monitoring IP Multicast Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Support for Multicast Router Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

BGP Multicasting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Investigating Multicast Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Chapter 2 Configuring IGMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

IGMP Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Group Membership Queries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Group Membership Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Leave Group Membership Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Platform Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Configuring Static and Dynamic IGMP Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Enabling IGMP on an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Configuring IGMP Settings for an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Specifying Multicast Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Assigning a Multicast Group to an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Configuring Group Outgoing Interface Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Configuring Access Node Control Protocol for IGMP . . . . . . . . . . . . . . . . . . . . . . . 52

Configuring SSM Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Limiting the Number of Accepted IGMP Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Including and Excluding Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Configuring Explicit Host Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Accepting IGMP Reports from Remote Subnetworks . . . . . . . . . . . . . . . . . . . . . . . 57

Disabling and Removing IGMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Monitoring IGMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

IGMP Proxy Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Configuring IGMP Proxy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Establishing the IGMP Proxy Baseline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Monitoring IGMP Proxy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Table of Contents

Chapter 3 Configuring PIM for IPv4 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

PIM Dense Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Overriding Prunes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Preventing Duplication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

PIM Sparse Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Joining Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

PIM Sparse Mode Bootstrap Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

PIM Sparse-Dense Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

PIM Source-Specific Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Platform Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Enabling PIM on a VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Disabling PIM on a VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Enabling PIM on an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Setting a Priority to Determine the Designated Router . . . . . . . . . . . . . . . . . . . . . 86

Configuring the PIM Join/Prune Message Interval . . . . . . . . . . . . . . . . . . . . . . . . . 87

Configuring an RP Router for PIM Sparse Mode and PIM Sparse-Dense Mode . . 88

Configuring a Static RP Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Configuring an Auto-RP Router for PIM Sparse Mode . . . . . . . . . . . . . . . . . . 88

Configuring an Auto-RP Router for PIM Sparse-Dense Mode . . . . . . . . . . . . 88

Configuring BSR and RP Candidates for PIM Sparse Mode . . . . . . . . . . . . . . . . . . 90

Migrating to BSR from Auto-RP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Switching to an SPT for PIM Sparse Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Creating Multicast VPNs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Creating Multicast VPNs Using the Default MDT . . . . . . . . . . . . . . . . . . . . . . . 92

Multicast VPN Configuration Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Creating Multicast VPNs Using the Data MDT . . . . . . . . . . . . . . . . . . . . . . . . . 96

Data MDT Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Data MDT Receivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Establishing a Data MDT Using ASM or SSM . . . . . . . . . . . . . . . . . . . . . . 97

Configuring the Default MDT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Configuring Data MDTs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Using PIM Sparse Mode Join Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Configuring PIM SSM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Configuring the BFD Protocol for PIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Removing PIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Resetting PIM Counters and Mappings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Monitoring PIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Monitoring PIM Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Monitoring PIM Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Chapter 4 Configuring DVMRP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Identifying Neighbors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Advertising Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Platform Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

JunosE 11.2.x Multicast Routing Configuration Guide

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Enabling DVMRP on a VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Activating DVMRP on an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Configuring DVMRP Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Filtering DVMRP Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Configuring DVMRP Summary Addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Changing the Metric for a Route . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Importing Routes from Other Protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Specifying Routes to Be Advertised . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Preventing Dynamic Route Distribution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Exchanging DVMRP Unicast Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Disabling and Removing DVMRP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Clearing DVMRP Routes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Configuring DVMRP Tunnels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Monitoring DVMRP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Part 2 Internet Protocol Version 6

Chapter 5 Configuring IPv6 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

IPv6 Multicast Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Reverse-Path Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142

Multicast Packet Forwarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Platform Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Configuring the Switching Fabric Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Enabling IPv6 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Defining Static Routes for Reverse-Path Forwarding . . . . . . . . . . . . . . . . . . . . . . 144

Displaying Available Routes for Reverse-Path Forwarding . . . . . . . . . . . . . . . . . . 145

Enabling and Disabling RPF Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Using Unicast Routes for RPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

Defining Permanent IPv6 Multicast Forwarding Entries . . . . . . . . . . . . . . . . . . . . 147

Defining a Multicast Bandwidth Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Using the Auto-Sense Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

How Adaptive Mode Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Multicast Bandwidth Map Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Configuring Multicast QoS Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Multicast OIF Mapping Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Multicast Traffic Receipt Without Forwarding . . . . . . . . . . . . . . . . . . . . . . . . 153

Activating Multicast QoS Adjustment Functions . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Configuring Hardware Multicast Packet Replication . . . . . . . . . . . . . . . . . . . . . . . 154

Supported Modules and Encapsulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Relationship with OIF Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Hardware Multicast Packet Replication Considerations . . . . . . . . . . . . . . . . 158

Configuring Hardware Multicast Packet Replication . . . . . . . . . . . . . . . . . . . 159

Monitoring Optimized Multicast Packet Replication . . . . . . . . . . . . . . . . . . . . 161

Port Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

IP and VLAN Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Table of Contents

MLD Statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Blocking and Limiting Multicast Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Blocking Mroutes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Limiting Interface Admission Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Enabling Interface Admission Bandwidth Limitation . . . . . . . . . . . . . . . 162

OIF Interface Reevaluation Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Creating Mroute Port Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Limiting Port Admission Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Enabling Port Admission Bandwidth Control . . . . . . . . . . . . . . . . . . . . . 164

OIF Port Reevaluation Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Deleting Multicast Forwarding Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Monitoring IPv6 Multicast Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

BGP Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Chapter 6 Configuring Multicast Listener Discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Multicast Listener Queries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Multicast Listener Reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Multicast Listener Done Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Platform Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Configuring Static and Dynamic MLD Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Enabling MLD on an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Configuring MLD Settings for an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Specifying Multicast Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Assigning a Multicast Group to an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

Configuring Group Outgoing Interface Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . 184

Configuring SSM Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Limiting the Number of Accepted MLD Groups . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Including and Excluding Traffic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Configuring Explicit Host Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

Disabling and Removing MLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Monitoring MLD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

MLD Proxy Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Configuring MLD Proxy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Setting the MLD Proxy Baseline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Monitoring MLD Proxy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

Chapter 7 Configuring PIM for IPv6 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

PIM Sparse Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

Joining Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

PIM Sparse Mode Bootstrap Router . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

PIM Source-Specific Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

Platform Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

Enabling and Disabling PIM on a VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

JunosE 11.2.x Multicast Routing Configuration Guide

Enabling PIM on an Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212

Setting a Priority to Determine the Designated Router . . . . . . . . . . . . . . . . . . . . . 212

Configuring the PIM Join/Prune Message Interval . . . . . . . . . . . . . . . . . . . . . . . . . 213

Configuring an RP Router for PIM Sparse Mode . . . . . . . . . . . . . . . . . . . . . . . . . . 213

Configuring BSR and RP Candidates for PIM Sparse Mode . . . . . . . . . . . . . . . . . 214

Switching to an SPT for PIM Sparse Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

Configuring PIM Sparse Mode Remote Neighbors . . . . . . . . . . . . . . . . . . . . . . . . 216

Using PIM Sparse Mode Join Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

Configuring PIM SSM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219

Configuring the BFD Protocol for PIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

Removing PIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

Resetting PIM Counters and Mappings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

Monitoring PIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

Monitoring PIM Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

Monitoring PIM Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

Part 3 Index

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

List of Figures

Part 1 Internet Protocol Version 4

Chapter 1 Configuring IPv4 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Figure 1: Example of Adaptive IPv4 Multicast Bandwidth Detection . . . . . . . . . . . . 12

Figure 2: Multicast OIF Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 3: Multicast Traffic Receipt Without Forwarding . . . . . . . . . . . . . . . . . . . . . . 17

Figure 4: Packet Flow Without Hardware Multicast Packet Replication . . . . . . . . . 18

Figure 5: Packet Flow with Hardware Multicast Packet Replication . . . . . . . . . . . . 19

Chapter 2 Configuring IGMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Figure 6: Static and Dynamic IGMP Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Figure 7: Upstream and Downstream Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Chapter 3 Configuring PIM for IPv4 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Figure 8: Source-Rooted Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Figure 9: PIM Dense Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Figure 10: Detecting Duplication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Figure 11: PIM Sparse Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Figure 12: Shared Tree Versus SPT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Figure 13: Multicast VPNs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Part 2 Internet Protocol Version 6

Chapter 5 Configuring IPv6 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Figure 14: Example of Adaptive IPv6 Multicast Bandwidth Detection . . . . . . . . . 149

Figure 15: Multicast OIF Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Figure 16: Multicast Traffic Receipt Without Forwarding . . . . . . . . . . . . . . . . . . . . 153

Figure 17: Packet Flow Without Hardware Multicast Packet Replication . . . . . . . 155

Figure 18: Packet Flow with Optimized Multicast Packet Replication . . . . . . . . . 156

Chapter 6 Configuring Multicast Listener Discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Figure 19: Static and Dynamic MLD Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Figure 20: Upstream and Downstream Interfaces . . . . . . . . . . . . . . . . . . . . . . . . 201

Chapter 7 Configuring PIM for IPv6 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Figure 21: Source-Rooted Tree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

Figure 22: Network on Which to Configure PIM SSM . . . . . . . . . . . . . . . . . . . . . . . 219

JunosE 11.2.x Multicast Routing Configuration Guide

List of Tables

About the Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix

Table 1: Notice Icons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx

Table 2: Text and Syntax Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx

Part 1 Internet Protocol Version 4

Chapter 1 Configuring IPv4 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Table 3: Function of Multicast Protocols on a Router . . . . . . . . . . . . . . . . . . . . . . . . 4

Table 4: Adaptive Mode Algorithm Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Chapter 2 Configuring IGMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Table 5: IGMP Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Chapter 4 Configuring DVMRP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Table 6: Sample Routing Table for a DVMRP Router . . . . . . . . . . . . . . . . . . . . . . . 123

Table 7: Sample DVMRP (S,G) Pair Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Part 2 Internet Protocol Version 6

Chapter 5 Configuring IPv6 Multicast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Table 8: Function of Multicast Protocols on a Router . . . . . . . . . . . . . . . . . . . . . . 142

Table 9: Adaptive Mode Algorithm Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

Chapter 6 Configuring Multicast Listener Discovery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Table 10: Static MLD Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

JunosE 11.2.x Multicast Routing Configuration Guide

About the Documentation

•

E Series and JunosE Documentation and Release Notes on page xix

•

Audience on page xix

•

E Series and JunosE Text and Syntax Conventions on page xix

•

Obtaining Documentation on page xxi

•

Documentation Feedback on page xxi

•

Requesting Technical Support on page xxi

E Series and JunosE Documentation and Release Notes

For a list of related JunosE documentation, see

http://www.juniper.net/techpubs/software/index.html .

If the information in the latest release notes differs from the information in the documentation, follow the JunosE Release Notes.

To obtain the most current version of all Juniper Networks®technical documentation,

see the product documentation page on the Juniper Networks website at

http://www.juniper.net/techpubs/.

Audience

This guide is intended for experienced system and network specialists working with Juniper Networks E SeriesBroadband Services Routers in an Internet access environment.

E Series and JunosE Text and Syntax Conventions

Table 1 on page xx defines notice icons used in this documentation.

JunosE 11.2.x Multicast Routing Configuration Guide

Table 1: Notice Icons

Table 2 on page xx defines text and syntax conventions that we use throughout the E Series and JunosE documentation.

DescriptionMeaningIcon

Indicates important features or instructions.Informational note

Indicates a situation that might result in loss of data or hardware damage.Caution

Alerts you to the risk of personal injury or death.Warning

Alerts you to the risk of personal injury from a laser.Laser warning

Table 2: Text and Syntax Conventions

Representscommandsand keywordsin text.Bold text like this

Fixed-width text like this

Italic text like this

Plus sign (+) linking key names

Syntax Conventions in the Command Reference Guide

Representsinformationas displayedon your terminal’s screen.

•

Emphasizes words.

•

Identifies variables.

•

Identifies chapter, appendix, and book names.

keys simultaneously.

ExamplesDescriptionConvention

•

Issue the clock source command.

•

Specify the keyword exp-msg.

host1(config)#traffic class low-loss1Represents text that the user must type.Bold text like this

host1#show ip ospf 2

Routing Process OSPF 2 with Router ID 5.5.0.250 Router is an Area Border Router (ABR)

•

There are two levels of access: user and privileged.

•

clusterId, ipAddress.

•

Appendix A, System Specifications

Press Ctrl + b.Indicates that you must press two or more

terminal lengthRepresents keywords.Plain text like this

mask, accessListNameRepresents variables.Italic text like this

Table 2: Text and Syntax Conventions (continued)

About the Documentation

ExamplesDescriptionConvention

| (pipe symbol)

or variable to the left or to the right of this symbol. (The keyword or variable can be either optional or required.)

[ ]* (brackets and asterisk)

that can be entered more than once.

Represent required keywords or variables.{ } (braces)

Obtaining Documentation

To obtain the most current version of all Juniper Networks technical documentation, see the Technical Documentation page on the Juniper Networks Web site at

http://www.juniper.net/.

To download complete sets of technical documentation to create your own documentation CD-ROMs or DVD-ROMs, see the Portable Libraries page at

http://www.juniper.net/techpubs/resources/index.html

diagnostic | lineRepresents a choice to select one keyword

[ internal | external ]Represent optional keywords or variables.[ ] (brackets)

[ level1 | level2 | l1 ]*Represent optional keywords or variables

{ permit | deny } { in | out }

{ clusterId | ipAddress }

Copies of the Management Information Bases (MIBs) for a particular software release are available for download in the software image bundle from the Juniper Networks Web site athttp://www.juniper.net/.

Documentation Feedback

We encourage you to provide feedback, comments, and suggestions so that we can improve the documentation to better meet your needs. Send your comments to

techpubs-comments@juniper.net, or fill out the documentation feedback form at

https://www.juniper.net/cgi-bin/docbugreport/. If you are using e-mail, be sure to include

the following information with your comments:

•

Document or topic name

•

URL or page number

•

Software release version

Requesting Technical Support

Technical productsupport isavailable through theJuniper NetworksTechnical Assistance Center (JTAC). If you are a customer with an active J-Care or JNASC support contract,

JunosE 11.2.x Multicast Routing Configuration Guide

or are covered under warranty, and need post-sales technical support, you can access our tools and resources online or open a case with JTAC.

•

JTAC policies—For a complete understanding of our JTAC procedures and policies, review the JTAC User Guide located at

http://www.juniper.net/us/en/local/pdf/resource-guides/7100059-en.pdf .

•

Product warranties—For product warranty information, visit

http://www.juniper.net/support/warranty/ .

•

JTAC hours of operation—The JTAC centers have resources available 24 hours a day, 7 days a week, 365 days a year.

Self-Help Online Tools and Resources

For quick and easy problem resolution, Juniper Networks has designed an online self-service portal called the Customer Support Center (CSC) that provides you with the following features:

•

Find CSC offerings: http://www.juniper.net/customers/support/

•

Search for known bugs: http://www2.juniper.net/kb/

•

Find product documentation: http://www.juniper.net/techpubs/

•

Find solutions and answer questions using our Knowledge Base: http://kb.juniper.net/

•

Download the latest versions of software and review release notes:

http://www.juniper.net/customers/csc/software/

•

Search technical bulletins for relevant hardware and software notifications:

https://www.juniper.net/alerts/

•

Join and participate in the Juniper Networks Community Forum:

http://www.juniper.net/company/communities/

•

Open a case online in the CSC Case Management tool: http://www.juniper.net/cm/

To verifyservice entitlement by product serialnumber, use our Serial Number Entitlement (SNE) Tool: https://tools.juniper.net/SerialNumberEntitlementSearch/

Opening a Case with JTAC

You can open a case with JTAC on the Web or by telephone.

•

Use the Case Management tool in the CSC at http://www.juniper.net/cm/ .

•

Call 1-888-314-JTAC (1-888-314-5822 toll-free in the USA, Canada, and Mexico).

For international or direct-dial options in countries without toll-free numbers, see

http://www.juniper.net/support/requesting-support.html .

PART 1

Internet Protocol Version 4

•

Configuring IPv4 Multicast on page 3

•

Configuring IGMP on page 41

•

Configuring PIM for IPv4 Multicast on page 77

•

Configuring DVMRP on page 121

JunosE 11.2.x Multicast Routing Configuration Guide

CHAPTER 1

Configuring IPv4 Multicast

IPv4 multicast enables a device to send packets to a group of hosts rather than to a list of individual hosts. This chapter describes how to configure IP multicast on the E Series router; it contains the following sections:

•

IPv4 Multicast Overview on page 3

•

Platform Considerations on page 5

•

References on page 6

•

Before You Begin on page 6

•

Configuring the Switch Fabric Bandwidth on page 6

•

Enabling IP Multicast on page 6

•

Defining Static Routes for Reverse-Path Forwarding on page 7

•

Displaying Available Routes for Reverse-Path Forwarding on page 7

•

Enabling and Disabling RPF Checks on page 9

•

Using Unicast Routes for RPF on page 9

•

Defining Permanent IP Multicast Forwarding Entries on page 10

•

Defining a Multicast Bandwidth Map on page 10

•

Configuring Multicast QoS Adjustment on page 15

•

Activating Multicast QoS Adjustment Functions on page 17

•

Configuring Hardware Multicast Packet Replication on page 17

•

Blocking and Limiting Multicast Traffic on page 25

•

Deleting Multicast Forwarding Entries on page 29

•

Monitoring IP Multicast Settings on page 29

•

BGP Multicasting on page 39

•

Investigating Multicast Routes on page 39

IPv4 Multicast Overview

IPv4 defines three types of addresses: unicast, broadcast, and multicast. Each type of address enables a device to send datagrams to selected recipients:

•

A unicast address enables a device to send a datagram to a single recipient.

JunosE 11.2.x Multicast Routing Configuration Guide

•

A broadcastaddress enables adevice to senda datagram to allhosts ona subnetwork.

•

A multicast address enables a device to send a datagram to a specified set of hosts, known as a multicast group, in different subnetworks.

Multicast IP packets contain a class D address in the Destination Address fields of their headers. Aclass D address is the IP address of a multicast group. See “Configuring IGMP” on page 41 and JunosE IP, IPv6, and IGP Configuration Guide, for information about class D addresses.

IP multicast improves network efficiency by enabling a host to transmit a datagram to a targeted group of receivers. For example, for a host to send a large video clip to a group of selected recipientswouldbe time-consumingto unicast the datagram to each recipient individually. If the host broadcasts the video clip throughout the network, network resources are not available for other tasks. The host uses only the resources it needs when multicasting the datagram.

Routers use multicast routing algorithms to determine the best route and transmit multicast datagrams throughout the network. E Series routers support a number of IP multicast protocols on virtual routers (VRs). Each VR handles the interoperability of IP multicast protocols automatically. To start multicast operation on a VR, you access the context for that VR and configure the desired protocols on the selected interfaces. Table 3 on page 4 describes the function of each protocol that the router supports.

Table 3: Function of Multicast Protocols on a Router

ProtocolIndependent Multicast Protocol (PIM)

Distance Vector Multicast Routing Protocol (DVMRP)

BGP Multicasting Protocol

The router supports up to 16,384 multicast forwarding entries (multicast routes) at any time.

Reverse-Path Forwarding

IP multicasting uses reverse path forwarding (RPF) to verify that a router receives a multicast packet on the correct incoming interface. The RPF algorithm enables a router to accept a multicast datagram only on the interface from which the router sends a unicast datagram to the source of the multicast datagram.

When the router receives a multicast datagram from a source for a group, the router verifies that the packet was received on the correct RPF interface. If the packet was not

FunctionProtocol

Discovers hosts that belong to multicast group.Internet Group Membership Protocol (IGMP)

Discovers other multicast routers to receive multicast packets.

Routes multicast datagrams within autonomous systems.

Routes multicast datagrams between autonomous systems.

received on the correct interface, the router discards the packet. Only packets received on the correct RPF interface are considered for forwarding to downstream receivers.

When operating in sparse-mode, the routers perform an RPF lookup to identify the upstream router from which to request the data and then send join messages for the multicast stream only to that router.

When operating in dense-mode, routers that have multiple paths to the source of the multicast stream initially receive the same stream on more than one interface. In this case, the routers perform an RPF lookup to identify multicast data streams that are not arriving on the best path and send prune messages to terminate these flows.

The RPF lookup need not always be towards the source of the multicast stream. The lookup is done towards the source only when the router is using a source-rooted tree to receive the multicast stream. If the router uses a shared tree instead, the RPF lookup is toward a rendezvous point and not toward the source of the multicast stream.

Multicast Packet Forwarding

Multicast packet forwarding is based on the source (S) of the multicast packet and the destination multicast group address (G). Foreach (S,G) pair, the router accepts multicast packetson an incoming interface(IIF), whichsatisfies the RPF check (RPF-IIF). The router drops packets received on IIFs other than the RPF-IIF and notifies the routing protocols that a packet was received on the wrong interface.

Chapter 1: Configuring IPv4 Multicast

The router forwards packets receivedon theRPF-IIF to alist of outgoing interfaces (OIFs). The list of OIFs is determined by the exchange of routing information and local group membership information. The router maintains mappings of (S,G, IIF) to {OIF1, OIF2…} in the multicast routing table.

You can enable two or more multicast protocols on an IIF. However, only one protocol can forward packets on that IIF. The protocol that forwards packets on an IIF owns that IIF.A multicast protocol that owns anIIF also owns the (S,G) entry in the multicast routing table.

Platform Considerations

For information about modules that support IP multicasting on the ERX7xx models, ERX14xx models, and the Juniper Networks ERX310 Broadband Services Router:

•

See ERX Module Guide, Table 1, Module Combinations for detailed module specifications.

•

See ERX Module Guide, Appendix A, Module Protocol Support for information about the modules that support IP multicasting.

For information about modules that support IP multicasting on the Juniper Networks E120 and E320 Broadband Services Routers:

•

See E120 and E320 Module Guide, Table 1, Modules and IOAs for detailed module specifications.

•

See E120 and E320 Module Guide, Appendix A, IOA Protocol Support for information about the modules that support IP multicasting.

JunosE 11.2.x Multicast Routing Configuration Guide

References

For more information about IP multicast, see the following resources:

•

A “traceroute” Facility for IPMulticast—draft-ietf-idmr-traceroute-ipm-07.txt(January 2001 expiration)

•

RFC 2858—Multiprotocol Extensions for BGP-4 (June 2000)

•

RFC 2932—IPv4 Multicast Routing MIB (October 2000)

•

RFC 3292—General Switch Management Protocol (GSMP) V3 (June 2002)

NOTE: IETF drafts are valid for only 6 months from the date of issuance. They must be

considered as works in progress. Refer to the IETF Web site at http://www.ietf.org for the latest drafts.

Before You Begin

You can configure multicasting on IPv4 and IPv6 interfaces.

For information about configuring IP and IPv6 interfaces, see JunosE IP, IPv6, and IGP Configuration Guide.

For information about configuring multicast on IPv6 interfaces, see “Configuring IPv6 Multicast” on page 141.

Configuring the Switch Fabric Bandwidth

By default, the switch fabric for the Juniper Networks ERX1440, ERX310, E120, and E320 Broadband Services Routers uses a bandwidth weighting ratio of 15:2 for multicast-to-unicast weighted round robin(WRR). In the absence of strict-prioritytraffic, and when both unicast and multicast traffic compete for switch fabric bandwidth, the switch fabric allocates15/17ths of the available bandwidth to multicasttraffic and 2/17ths of the available bandwidth to unicast traffic.

You can use the fabric weights command to change the ratio for multicast-to-unicast traffic on the router switch fabric. For more information about the fabric weights command, see JunosE System Basics Configuration Guide.

Enabling IP Multicast

In thisimplementation,IP multicast works on virtual routers (VRs).By default,IP multicast is disabled on a VR. To enable IP multicast on a VR, access the context for a VR, and then issue the ip multicast-routing command.

ip multicast-routing

• Use to enable IP multicast routing on the VR.

• By default, IP multicast is disabled on the VR. In the disabled state, all multicast

protocols are disabled, and the VR forwards no multicast packets.

• Example

host1(config)#ip multicast-routing

• Use the no version to disable IP multicast routing on the VR (the default).

• See ip multicast-routing.

Defining Static Routes for Reverse-Path Forwarding

Use the ip rpf-route command to define reverse-path forwarding (RPF) to verify that a router receives a multicast packet on the correct incoming interface.

ip rpf-route

• Use to customize static routes that the router may use for RPF.

Chapter 1: Configuring IPv4 Multicast

• Specify the IP address and subnet mask of the destination network.

• Specify eithera next-hop IPaddressor aninterfacetype and specifier, such as atm 3/0.

For details about interface types and specifiers, see Interface Types and Specifiers in JunosE Command Reference Guide.

• Optionally, specify the distance (number of hops) to the next-hop address.

• Optionally, specify a route's tag number to identify a particular route in the routing

table.

• Example

host1(config)#ip rpf-route 11.1.0.0 255.255.0.0 atm4/1.1 56 tag 25093

• Use the no version to remove the static route.

• See ip rpf-route.

Displaying Available Routes for Reverse-Path Forwarding

Use the show ip rpf-route command to display all available routes, only the routes to a particular destination, orroutes associatedwith a specific unicast protocol that therouter can use for Reverse-Path Forwarding (RPF).

show ip rpf-route

• Use to display routes that the router can use for RPF.

• Specify the IP address and the network mask toview routes to a particular destination.

• Specify a unicast routing protocol to view routes associated with that protocol.

• Field descriptions

JunosE 11.2.x Multicast Routing Configuration Guide

• Prefix—Value of the logical AND of the IP address of the destination network and

the subnet address

• Length—Length of the subnet mask in bits

• Type—Protocol type for the interface

• Connect—Subnet directly connected to the interface

• Static—Static route

• protocol-name—Route learned through the named protocol

• Next Hop—IP address of the next hop for this route

• Dist—Distance configured for this route

• Met—Learned or configured cost associated with this route

• Intf—Type of interface and interface specifier for the next hop. For details about

interfacetypes and specifiers,seeInterface Types andSpecifiersin JunosECommand Reference Guide.

• Example 1

host1#show ip rpf-route Protocol/Route type codes: I1- ISIS level 1, I2- ISIS level2, I- route type intra, IA- route type inter, E- route type external, i- metric type internal, e- metric type external, O- OSPF, E1- external type 1, E2- external type2, N1- NSSA external type1, N2- NSSA external type2 L- MPLS label, V- VR/VRF, *- indirect next-hop

Prefix/Length Type Next Hop Dist/Met Intf

------------- ---- -------- -------- ------

10.10.0.112/32 Static 192.168.1.1 1/1 fastEthernet0/0

10.1.1.0/24 Connect 10.1.1.1 0/1 atm3/0.100

25.25.25.25/32 Connect 25.25.25.25 0/1 loopback0

• Example 2

host1#show ip rpf-route static Protocol/Route type codes: I1- ISIS level 1, I2- ISIS level2, I- route type intra, IA- route type inter, E- route type external, i- metric type internal, e- metric type external, O- OSPF, E1- external type 1, E2- external type2, N1- NSSA external type1, N2- NSSA external type2 L- MPLS label, V- VR/VRF, *- indirect next-hop

Prefix/Length Type Next Hop Dist/Met Intf

------------- ---- -------- -------- --------------

10.10.0.112/32 Static 192.168.1.1 1/1 fastEthernet0/0

• See show ip rpf-route.

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Juniper JUNOSE 11.2.X MULTICAST ROUTING Configuration Manual

Specifications and Main Features

Frequently Asked Questions

User Manual