Cisco IOS XR Software Release 5.1 Configuration Guide

Cisco ASR 9000 Series Aggregation Services Router Multicast

Configuration Guide, Release 5.3.x

First Published: 2015-01-15

Last Modified: 2015-09-01

Americas Headquarters

Cisco Systems, Inc.

170 West Tasman Drive

San Jose, CA 95134-1706

USA

http://www.cisco.com

Tel: 408 526-4000

800 553-NETS (6387)

Fax: 408 527-0883

THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS,

INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS.

THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH

THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY,

CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.

The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB's public domain version of

NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS" WITH ALL FAULTS.

CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE.

IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT

LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS

HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network

topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional

and coincidental.

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com

go trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any

other company. (1721R)

CONTENTS

Preface xiii

PREFACE

Changes to This Document xiii

Obtaining Documentation and Submitting a Service Request xiii

New and Changed Multicast Features 1

CHAPTER 1

New and Changed Multicast Features 1

Implementing Layer-2 Multicast with IGMP Snooping 3

CHAPTER 2

Prerequisites for IGMP Snooping 3

Restrictions for IGMP Snooping 4

Information About IGMP Snooping 4

IGMP Snooping Overview 4

Description of Basic Functions 4

High Availability Features 5

Bridge Domain Support 5

Multicast Router and Host Ports 5

Multicast Router Discovery and Static Configuration 5

Multicast Traffic Handling within a Bridge Domain with IGMP Snooping Enabled 6

Multichassis Link Aggregation 7

Bidirectional Internet Group Management Protocol Snoop Synchronization for Satellite Dual-Homed

System 7

Restrictions 8

Information About IGMP Snooping Configuration Profiles 8

Creating Profiles 9

Attaching and Detaching Profiles 9

Changing Profiles 9

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

iii

Configuring Access Control 9

Default IGMP Snooping Configuration Settings 11

IGMP Snooping Configuration at the Bridge Domain Level 12

IGMP Minimum Version 12

System IP Address 12

Group Membership Interval, Robustness Variable, and Query Interval 12

Report Suppression (IGMPv2) and Proxy Reporting (IGMPv3) 13

Group Leave Processing 13

Reaction to Topology Change Notifications 14

IGMP Snooping Packet Checks 15

Startup Query Configuration 16

IGMP Snooping Configuration at the Host Port Level 16

Router Guard and Static Mrouter 16

Immediate-Leave 17

Static Groups 17

Internal Querier 17

When to Use an Internal Querier 17

Internal Querier Default Configuration 18

Internal Querier Processing 18

Querier Election for One Active Querier 19

Internal Querier Reaction to TCNs 19

How to Configure IGMP Snooping 19

Creating an IGMP Snooping Profile 20

Where to Go Next 21

Attaching a Profile and Activating IGMP Snooping on a Bridge Domain 21

Detaching a Profile and Deactivating IGMP Snooping on a Bridge Domain 22

Attaching and Detaching Profiles to Ports Under a Bridge 24

Adding Static Mrouter Configuration to a Profile 25

Where to Go Next 26

Adding Router Guard to a Profile 26

Where to Go Next 27

Configuring Immediate-Leave 27

Where to Go Next 28

Configuring Static Groups 28

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

iv

Contents

Where to Go Next 29

Configuring an Internal Querier 30

Where to Go Next 31

Verifying Multicast Forwarding 31

Configuring Group Limits 31

Configuring route-policy 31

Configuring group limit 32

Configuring access-groups 33

Configuration Examples for IGMP Snooping 34

Configuring IGMP Snooping on Physical Interfaces Under a Bridge: Example 34

Configuring IGMP Snooping on VLAN Interfaces Under a Bridge: Example 35

Configuring IGMP Snooping on Ethernet Bundles Under a Bridge: Example 35

Configuring IGMP Snooping on VFIs Under a Bridge: Example 37

Configuring IGMP access-groups 40

Configuring IGMP Snooping over MCLAG: Example 40

Case 1: Downstream MCLAG 40

Case 2 : Upstream MCLAG 46

Additional References 52

Implementing MLD Snooping 55

CHAPTER 3

MLD Snooping 55

Prerequisites for MLD Snooping 56

Restrictions for MLD Snooping 56

Advantages of MLD Snooping 56

High Availability (HA) features for MLD 57

Bridge Domain Support for MLD 57

Multicast Router and Host Ports 57

Multicast Router Discovery for MLD 57

Multicast Traffic Handling for MLD 58

Creating a MLD Snooping Profile 59

Activating MLD Snooping on a Bridge Domain 60

Deactivating MLD Snooping on a Bridge Domain 61

Configuring Static Mrouter Ports (MLD) 62

Configuring Router Guard (MLD) 63

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

v

Contents

Configuring Immediate-leave for MLD 64

Configuring Internal Querier for MLD 65

Configuring Static Groups for MLD 66

Configuring MLD Snooping 67

Configuring MLD Snooping on Ethernet Bundles 68

Implementing Layer-3 Multicast Routing on Cisco IOS XR Software 71

CHAPTER 4

Prerequisites for Implementing Multicast Routing 72

Information About Implementing Multicast Routing 73

Key Protocols and Features Supported in the Cisco IOS XR Software Multicast Routing

Implementation 73

Multicast Routing Functional Overview 74

Multicast Routing Implementation 74

PIM-SM, PIM-SSM, and PIM-BIDIR 75

PIM-SM Operations 75

PIM-SSM Operations 75

PIM-Bidirectional Operations 76

Restrictions for PIM-SM and PIM-SSM, and PIM BIDIR 76

Internet Group Management Protocol 76

IGMP Versions 77

IGMP Routing Example 77

Configuring IGMP Per Interface States Limit 78

Protocol Independent Multicast 79

PIM-Sparse Mode 79

PIM-Source Specific Multicast 80

PIM-Bidirectional Mode 82

Configuring PIM Per Interface States Limit 82

PIM Shared Tree and Source Tree (Shortest Path Tree) 83

Multicast-Intact 85

Designated Routers 85

Rendezvous Points 87

Auto-RP 87

PIM Bootstrap Router 88

Reverse-Path Forwarding 88

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

vi

Contents

Multicast Non-Stop Routing 89

Failure Scenarios in NSR 89

Multicast VPN 90

Multicast VPN Routing and Forwarding 91

Multicast Distribution Tree Tunnels 91

InterAS Support on Multicast VPN 92

IPv6 Connectivity over MVPN 93

BGP Requirements 93

Multitopology Routing 93

Multicast VPN Extranet Routing 94

Information About Extranets 94

Information About the Extranet MVPN Routing Topology 95

RPF Policies in an Extranet 97

Multicast VPN Hub and Spoke Topology 97

Realizing the Hub and Spoke Topology 98

Label Switched Multicast (LSM) Multicast Label Distribution Protocol (mLDP) based Multicast

VPN (mVPN) Support 99

Benefits of LSM MLDP based MVPN 99

Configuring MLDP MVPN 99

P2MP and MP2MP Label Switched Paths 100

Packet Flow in mLDP-based Multicast VPN 100

Realizing a mLDP-based Multicast VPN 100

Characteristics of mLDP Profiles 101

Summary of Supported MVPN Profiles 108

LSP-switch for P2MP-TE 109

Configuration Process for MLDP MVPN (Intranet) 109

MLDP Loop-Free Alternative Fast Reroute 111

Advantages of LFA FRR 113

MLDP LFA FRR - Features 113

Limitations of LFA FRR 114

MLDP LFA FRR - Working 114

MLDP LFA FRR - Behavior 115

Configurations to Enable LFA FRR 117

Multipoint Label Distribution Protocol Route Policy Map 134

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

vii

Contents

Configuring mLDP User Interface (Opaque Types) Using the Routing Policy 136

Configuring mLDP FEC at the Root Node 145

Configuring the mLDP User Interface to Filter Label Mappings 146

Configuring the mLDP User Interface for Feature Filtering 147

Limitations of Route Policy Map 152

Next-Generation Multicast VPN 152

Supported Features 153

PE-PE Ingress Replication 156

MVPN over GRE 156

Native Multicast 157

GRE Limitations 158

Signaling and RPF on GRE Tunnels 158

PIM Registration 159

Auto-RP 159

Multicast IRB 159

Supported bridge port types 159

Restrictions 159

Multicast IRB 159

Multicast support for PW-HE interfaces 160

Multicast Source Discovery Protocol 160

VRF-aware MSDP 160

Multicast Nonstop Forwarding 161

Multicast Configuration Submodes 161

Multicast-Routing Configuration Submode 161

PIM Configuration Submode 162

IGMP Configuration Submode 162

MLD Configuration Submode 162

MSDP Configuration Submode 162

Understanding Interface Configuration Inheritance 162

Understanding Interface Configuration Inheritance Disablement 163

Understanding Enabling and Disabling Interfaces 164

Multicast Routing Information Base 164

Multicast Forwarding Information Base 164

MSDP MD5 Password Authentication 164

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

viii

Contents

Overriding VRFs in IGMP Interfaces 165

VRF support for MLD 166

How to Implement Multicast Routing 166

Configuring PIM-SM and PIM-SSM 166

Configuring PIM-SSM for Use in a Legacy Multicast Deployment 167

Restrictions for PIM-SSM Mapping 168

Configuring a Set of Access Control Lists for Static SSM Mapping 168

Configuring a Set of Sources for SSM Mapping 169

Configuring the DNS-based SSM Mapping 170

Configuring a Static RP and Allowing Backward Compatibility 171

Configuring Auto-RP to Automate Group-to-RP Mappings 172

Configuring the Bootstrap Router 174

Calculating Rates per Route 176

Configuring Multicast Nonstop Forwarding 178

Configuring Multicast VPN 180

Prerequisites for Multicast VPN 181

Restrictions for Multicast VPN for Multicast Routing 181

Enabling a VPN for Multicast Routing 181

Specifying the PIM VRF Instance 184

Specifying the IGMP VRF Instance 185

Configuring the MDT Source per VRF 185

Configuring Label Switched Multicast 187

Verification of LSM mLDP based MVPN Configuration 192

Configuring Multitopology Routing 195

Restrictions for Configuring Multitopology Routing 196

Information About Multitopology Routing 196

Configuring an RPF Topology in PIM 196

Configuring MVPN Extranet Routing 198

Prerequisites for MVPN Extranet Routing 198

Restrictions for MVPN Extranet Routing 198

Configuring VPN Route Targets 199

Interconnecting PIM-SM Domains with MSDP 200

Controlling Source Information on MSDP Peer Routers 203

Configuring MSDP MD5 Password Authentication 205

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

ix

Contents

Configuring VRF for MSDP 206

Multicast only fast reroute (MoFRR) 207

Operating Modes of MoFRR 207

Restrictions 207

Non-ECMP MoFRR 207

Implementing Non-ECMP MoFRR 208

Configuring MoFRR 208

RIB-based MoFRR 208

Flow-based MoFRR 209

Configuring Head PE Router (for MoFRR) 210

Configuring Tail PE Router (for MoFRR) 211

Enabling multicast on PW-HE interfaces 213

Static join 214

Configuring Route Policy for Static RPF 215

Point-to-Multipoint Traffic Engineering Label-Switched Multicast 217

Point to Multipoint LSP(P2MP) 217

Multicast Routing Protocol support for P2MP 217

Enabling Multicast Forwarding Over Tunnel Interface (at Ingress Node) 217

P2MP configurations at egress node and bud node 218

Configuring Static Reverse Path Forwarding (RPF) 218

Configuring Core Tree Protocol 219

Configuring IGMP VRF Override 220

Specifying VRF definition 220

Enabling Multicast Routing on default and non-default VRFs 221

Configuring an Interface for a Non-default VRF Instance 222

Configuring route-policy 223

Associating a route policy to PIM configuration for the VRF receiving IGMP reports 223

Configuration Examples for Implementing Multicast Routing on Software 224

DNS-based SSM Mapping: Example 224

Calculating Rates per Route: Example 225

Preventing Auto-RP Messages from Being Forwarded on Software: Example 226

Inheritance in MSDP on Software: Example 226

MSDP-VRF: Example 227

MoFRR Provider Edge Configuration: Example 228

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

x

Contents

Configuring Route Policy for Static RPF: Example 228

Configuring IPv4 Multicast VPN: Example 228

Configuring MVPN to Advertise Routes Between the CE and the PE Using OSPF: Example 228

Configuring MVPN to Advertise Routes Between the CE and the PE Using BGP: Example 233

Configuration Examples for MVPN Profiles 238

Configuration Examples for Inband mLDP Profiles 238

Configuration Examples for P2MP-TE profiles 239

Configuration examples for Partitioned mLDP profiles 242

Configuration Examples for Rosen-mGRE profiles 244

Configuration Examples for Rosen mLDP profiles 246

Configuration Examples for multicast support on PW-HE 249

Configuring MVPN Extranet Routing: Example 250

Configuring the Source MVRF on the Receiver PE Router: Example 250

Configuring the Receiver MVRF on the Source PE Router: Example 253

Configuring Multicast Hub and Spoke Topology: Example 255

Hub and Spoke Non-Turnaround Configuration: Example 256

Hub and Spoke with Turnaround: Example 265

Configuring LSM based MLDP: Examples 273

Additional References 284

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

xi

Contents

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

xii

Contents

Preface

From Release 6.1.2 onwards, Cisco introduces support for the 64-bit Linux-based IOS XR operating system.

Extensive feature parity is maintained between the 32-bit and 64-bit environments. Unless explicitly marked

otherwise, the contents of this document are applicable for both the environments. For more details on Cisco

IOS XR 64 bit, refer to the Release Notes for Cisco ASR 9000 Series Routers, Release 6.1.2 document.

The preface contains these sections:

•Changes to This Document, on page xiii

•Obtaining Documentation and Submitting a Service Request, on page xiii

Changes to This Document

This table lists the technical changes made to this document since it was first printed.

SummaryDate

Initial release of this document for 5.3.0 release.January 2015

Documentation updates for the 5.3.2 release.September 2015

Obtaining Documentation and Submitting a Service Request

For information on obtaining documentation, using the Cisco Bug Search Tool (BST), submitting a service

request, and gathering additional information, see What's New in Cisco Product Documentation.

To receive new and revised Cisco technical content directly to your desktop, you can subscribe to the What's

New in Cisco Product Documentation RSS feed. RSS feeds are a free service.

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

xiii

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

xiv

Preface

Obtaining Documentation and Submitting a Service Request

CHAPTER 1

New and Changed Multicast Features

This chapter lists all the features that have been added or modified in this guide. The table also contains

references to these feature documentation sections.

•New and Changed Multicast Features, on page 1

New and Changed Multicast Features

This table summarizes the new and changed information for Multicast Configuration Guide and provide

information on where they are documented.

Table 1: New and Changed Multicast Feature Information

Where DocumentedChanged in ReleaseDescriptionFeature

Configuring PIM Per

Interface States Limit, on

page 82

Configuring IGMP Per

Interface States Limit, on

page 78

Release 5.3.0This feature was

introduced.

Multicast CAC

MLDP Loop-Free

Alternative Fast Reroute,

on page 111

Release 5.3.2This feature was

introduced.

MLDP LFA FRR

Native Multicast, on page

157

Release 5.3.2IPv6 support was

introduced on Multicast

over Point-to-Point GRE

tunnels feature.

IPv6 Multicast over

Point-to-Point GRE

tunnels

DNS-based SSM

Mapping, on page 80

Release 5.3.2This feature was

introduced.

DNS-based SSM

Mapping

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

1

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

2

New and Changed Multicast Features

CHAPTER 2

Implementing Layer-2 Multicast with IGMP

Snooping

Internet Group Management Protocol (IGMP) snooping restricts multicast flows at Layer 2 to only those

segments with at least one interested receiver. This module describes how to implement IGMP snooping on

Cisco ASR 9000 Series Routers.

Feature History for IGMP Snooping

ModificationRelease

This feature was introduced.Release 3.7.2

Support was added for the following features:

• IGMP snooping group limits and access groups.

Release 3.9.2

Support was added for the following features:

• Multicast redundancy using Multi-Chassis Link Aggregation

(MC-LAG).

Release 4.0.0

•Prerequisites for IGMP Snooping, on page 3

•Restrictions for IGMP Snooping, on page 4

•Information About IGMP Snooping, on page 4

•How to Configure IGMP Snooping, on page 19

•Configuration Examples for IGMP Snooping, on page 34

•Additional References, on page 52

Prerequisites for IGMP Snooping

The following prerequisites must be satisfied before implementing IGMP snooping:

• The network must be configured with a Layer 2 VPN (L2VPN).

• You must be in a user group associated with a task group that includes the proper task IDs. The command

reference guides include the task IDs required for each command. If you suspect user group assignment

is preventing you from using a command, contact your AAA administrator for assistance.

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

3

To use this command, you must be in a user group associated with a task group that includes appropriate

task IDs. If the user group assignment is preventing you from using a command, contact your AAA

administrator for assistance.

Restrictions for IGMP Snooping

• IGMP snooping is supported only under L2VPN bridge domains.

• Explicit host tracking (an IGMPv3 snooping feature) is not supported.

• IPv6 Multicast Listener Discovery (MLD) snooping is not supported.

• IGMPv1 is not supported.

Information About IGMP Snooping

IGMP Snooping Overview

Description of Basic Functions

IGMP snooping provides a way to constrain multicast traffic at Layer 2. By snooping the IGMP membership

reports sent by hosts in the bridge domain, the IGMP snooping application can set up Layer 2 multicast

forwarding tables to deliver traffic only to ports with at least one interested member, significantly reducing

the volume of multicast traffic.

Configured at Layer 3, IGMP provides a means for hosts in an IPv4 multicast network to indicate which

multicast traffic they are interested in and for routers to control and limit the flow of multicast traffic in the

network at Layer 3.

IGMP snooping uses the information in IGMP membership report messages to build corresponding information

in the forwarding tables to restrict IP multicast traffic at Layer 2. The forwarding table entries are in the form

<Route, OIF List>, where:

• Route is a <*, G> route or <S, G> route.

• OIF List comprises all bridge ports that have sent IGMP membership reports for the specified route plus

all multicast router (mrouter) ports in the bridge domain.

Implemented in a multicast network, IGMP snooping has the following attributes:

• In its basic form, it reduces bandwidth consumption by reducing multicast traffic that would otherwise

flood an entire VPLS bridge domain.

• With the use of some optional configurations, it provides security between bridge domains by filtering

the IGMP reports received from hosts on one bridge port and preventing leakage towards the hosts on

other bridge ports.

• Using optional configurations, reduces the traffic impact on upstream IP multicast routers by suppressing

IGMP membership reports (IGMPv2) or by acting as an IGMP proxy reporter (IGMPv3) to the upstream

IP multicast router.

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

4

Implementing Layer-2 Multicast with IGMP Snooping

Restrictions for IGMP Snooping

High Availability Features

All high availability features apply to the IGMP snooping processes with no additional configuration beyond

enabling IGMP snooping. The following high availability features are supported:

• Process restarts

• RP Failover

• Stateful Switch-Over (SSO)

• Non-Stop Forwarding (NSF)—Forwarding continues unaffected while the control plane is restored

following a process restart or route processor (RP) failover.

• Line card online insertion and removal (OIR)

Bridge Domain Support

IGMP snooping operates at the bridge domain level. When IGMP snooping is enabled on a bridge domain,

the snooping functionality applies to all ports under the bridge domain, including:

• Physical ports under the bridge domain.

•Ethernet flow points (EFPs)—An EFP can be a VLAN, VLAN range, list of VLANs, or an entire interface

port.

• Pseudowires (PWs) in VPLS bridge domains.

•Ethernet bundles—Ethernet bundles include IEEE 802.3ad link bundles and Cisco EtherChannel bundles.

From the perspective of the IGMP snooping application, an Ethernet bundle is just another EFP. The

forwarding application in the Cisco ASR 9000 Series Routers randomly nominates a single port from

the bundle to carry the multicast traffic.

Multicast Router and Host Ports

IGMP snooping classifies each port (for example, EFPs, PWs, physical ports, or EFP bundles) as one of the

following:

• Multicast router ports (mrouter ports)—These are ports to which a multicast-enabled router is connected.

Mrouter ports are usually dynamically discovered, but may also be statically configured. Multicast traffic

is always forwarded to all mrouter ports, except when an mrouter port is the ingress port.

• Host ports—Any port that is not an mrouter port is a host port.

Multicast Router Discovery and Static Configuration

IGMP snooping discovers mrouter ports dynamically. You can also explicitly configure a port as an mrouter

port.

• Discovery—IGMP snooping identifies upstream mrouter ports in the bridge domain by snooping IGMP

query messages and Protocol Independent Multicast Version 2 (PIMv2) hello messages. Snooping PIMv2

hello messages identifies IGMP nonqueriers in the bridge domain.

• Static configuration—You can statically configure a port as an mrouter port with the mrouter command

in a profile attached to the port. Static configuration can help in situations when incompatibilities with

non-Cisco equipment prevent dynamic discovery.

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

5

Implementing Layer-2 Multicast with IGMP Snooping

High Availability Features

The router-guard command prevents a port from becoming a dynamically discovered mrouter port by filtering

out multicast router messages, including IGMP queries and PIM messages. You can configure a port with the

router-guard command and then configure it as a static mrouter. See the Router Guard and Static Mrouter,

on page 16 for more information about configuring router-guard and mrouter commands on the same port.

Multicast Traffic Handling within a Bridge Domain with IGMP Snooping Enabled

The following tables describe traffic handling behaviors by IGMP snooping mrouter and host ports. Table 2:

Multicast Traffic Handling for an IGMPv2 Querier, on page 6 describes traffic handling for an IGMPv2

querier. Table 3: Multicast Traffic Handling for an IGMPv3 Querier, on page 6 applies to an IGMPv3

querier.

By default, IGMP snooping supports IGMPv2 and IGMPv3. The version of the IGMP querier discovered in

the bridge domain determines the operational version of the snooping processes. If you change the default,

configuring IGMP snooping to support a minimum version of IGMPv3, IGMP snooping ignores any IGMPv2

queriers.

Table 2: Multicast Traffic Handling for an IGMPv2 Querier

Received on Host PortsReceived on MRouter PortsTraffic Type

Forwards to all mrouter ports and to

host ports that indicate interest.

Forwards to all mrouter ports and to host

ports that indicate interest.

IP multicast source

traffic

—Forwards to all ports.IGMP general queries

DroppedForwards to all other mrouter ports.IGMP group-specific

queries

Examines (snoops) the reports.

• If report suppression is enabled,

forwards first join for a new group

or first join following a general

query for an existing group.

• If report suppression is disabled,

forwards on all mrouter ports.

Examines (snoops) the reports.

• If report suppression is enabled,

forwards first join for a new group or

first join following a general query

for an existing group.

• If report suppression is disabled,

forwards on all mrouter ports.

IGMPv2 joins

IgnoresIgnoresIGMPv3 reports

Invokes last member query processing.Invokes last member query processing.IGMPv2 leaves

Table 3: Multicast Traffic Handling for an IGMPv3 Querier

Received on Host PortsReceived on MRouter PortsTraffic Type

Forwards to all mrouter ports and to

host ports that indicate interest.

Forwards to all mrouter ports and to host

ports that indicate interest.

IP multicast source

traffic

—Forwards to all ports.IGMP general queries

—If received on the querier port floods on all

ports.

IGMP group-specific

queries

Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 5.3.x

6

Implementing Layer-2 Multicast with IGMP Snooping

Multicast Traffic Handling within a Bridge Domain with IGMP Snooping Enabled

Page is loading ...

Cisco IOS XR Software Release 5.1 , IOS XR Software Release 4.3 , IOS XR Software Release 5.0 , IOS XR Software Release 5.2 , IOS XR Software Release 5.3 , IOS XR Software Release 6.5 Configuration Guide

Related papers

Other documents