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IGMPv3

October 2002

[ Page 1 ]

RFC: 3376

Network Working Group B. Cain

Request for Comments: 3376 Cereva Networks

Obsoletes: 2236 S. Deering

Category: Standards Track I. Kouvelas

Cisco Systems

B. Fenner

AT&T Labs - Research

A. Thyagarajan

Ericsson

October 2002

Internet Group Management Protocol, Version 3

Network Dictionary

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ary.html

Network Protocols Map

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Network Security Map

http://www.javvin.com/securitymap.

html

Wireless Communications

Technology Map

http://www.javvin.com/wirelessmap.

html

Network Protocols Hand-

book

http://www.javvin.com/model.html

TCP/IP Quick Guide

http://www.javvin.com/tcpipguide.html

Ethernet Quick Guide

http://www.javvin.com/ethernetguide.

html

Packet Analyzer

http://www.javvin.com/packet.html

DiskShare

http://www.javvin.com/diskshare.html

DiskAccess

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LANsurveyor

http://www.javvin.com/LANsurveyor.

html

CyberGauge

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html

Easy Network Service

Monitor

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IGMPv3

October 2002

[ Page 2 ]

Status of this Memo

This document species an Internet standards track protocol for the Internet community, and requests

discussion and suggestions for improvements. Please refer to the current edition of the "Internet Ofcial

Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this

memo is unlimited.

Abstract

This document species Version 3 of the Internet Group Management Protocol, IGMPv3. IGMP is the pro-

tocol used by IPv4 systems to report their IP multicast group memberships to neighboring multicast routers.

Version 3 of IGMP adds support for "source ltering", that is, the ability for a system to report interest in

receiving packets *only* from specic source addresses, or from *all but* specic source addresses, sent

to a particular multicast address. That information may be used by multicast routing protocols to avoid

delivering multicast packets from specic sources to networks where there are no interested receivers.

This document obsoletes RFC 2236.

Network Dictionary

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ary.html

Network Protocols Map

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Network Security Map

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html

Wireless Communications

Technology Map

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html

Network Protocols Hand-

book

http://www.javvin.com/model.html

TCP/IP Quick Guide

http://www.javvin.com/tcpipguide.html

Ethernet Quick Guide

http://www.javvin.com/ethernetguide.

html

Packet Analyzer

http://www.javvin.com/packet.html

DiskShare

http://www.javvin.com/diskshare.html

DiskAccess

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LANsurveyor

http://www.javvin.com/LANsurveyor.

html

CyberGauge

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html

Easy Network Service

Monitor

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Business Card Scanner

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scanner.html

Color Cards and Picture

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ner.html

Portable Document Scan-

ner

http://www.javvin.com/portablescan-

ner.html

www.javvin.com

www.networkdictionary.

com

Network Dictionary

http://www.javvin.com/networkdiction-

ary.html

Network Protocols Map

http://www.javvin.com/map.html

Network Security Map

http://www.javvin.com/securitymap.

html

Wireless Communications

Technology Map

http://www.javvin.com/wirelessmap.

html

Network Protocols Hand-

book

http://www.javvin.com/model.html

TCP/IP Quick Guide

http://www.javvin.com/tcpipguide.html

Ethernet Quick Guide

http://www.javvin.com/ethernetguide.

html

Packet Analyzer

http://www.javvin.com/packet.html

DiskShare

http://www.javvin.com/diskshare.html

DiskAccess

http://www.javvin.com/diskaccess.html

LANsurveyor

http://www.javvin.com/LANsurveyor.

html

CyberGauge

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html

Easy Network Service

Monitor

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Business Card Scanner

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scanner.html

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IGMPv3

October 2002

[ Page 3 ]

Table of Contents

1. Introduction ...................................................................................................6

2. The Service Interface for Requesting IP Multicast Reception ......................6

3. Multicast Reception State Maintained by Systems .......................................7

3.1. Socket State ...........................................................................................7

3.2. Interface State ........................................................................................7

4. Message Formats ..........................................................................................9

4.1. Membership Query Message .................................................................9

4.1.1. Max Resp Code ..................................................................................9

4.1.2. Checksum .........................................................................................

4.1.3. Group Address ..................................................................................

4.1.4. Resv (Reserved) ...............................................................................10

4.1.5. S Flag (Suppress Router-Side Processing) .......................................10

4.1.6. QRV (Querier's Robustness Variable) ..............................................10

4.1.7. QQIC (Querier's Query Interval Code) ............................................10

4.1.8. Number of Sources (N) ....................................................................11

4.1.9. Source Address [i] ............................................................................11

4.1.10. Additional Data ..............................................................................11

4.1.11. Query Variants ................................................................................11

4.1.12. IP Destination Addresses for Queries .............................................11

4.2. Version 3 Membership Report Message .............................................11

4.2.1. Reserved ...........................................................................................12

4.2.2. Checksum .........................................................................................12

4.2.3. Number of Group Records (M) ........................................................12

4.2.4. Group Record ...................................................................................12

4.2.5. Record Type .....................................................................................13

4.2.6. Aux Data Len ...................................................................................13

4.2.7. Number of Sources (N) ....................................................................13

4.2.8. Multicast Address .............................................................................13

4.2.9. Source Address [i] ............................................................................13

4.2.10. Auxiliary Data ................................................................................13

4.2.11. Additional Data ..............................................................................13

4.2.12. Group Record Types .......................................................................13

4.2.13. IP Source Addresses for Reports ....................................................14

4.2.14. IP Destination Addresses for Reports .............................................

4.2.15. Notation for Group Records ...........................................................

4.2.16. Membership Report Size ................................................................15

5. Description of the Protocol for Group Members ........................................15

5.1. Action on Change of Interface State ...................................................16

5.2. Action on Reception of a Query ..........................................................17

6. Description of the Protocol for Multicast Routers ......................................18

6.1. Conditions for IGMP Queries .............................................................19

6.2. IGMP State Maintained by Multicast Routers ....................................19

6.2.1. Denition of Router Filter-Mode .....................................................19

Network Dictionary

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ary.html

Network Protocols Map

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Network Security Map

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Wireless Communications

Technology Map

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html

Network Protocols Hand-

book

http://www.javvin.com/model.html

TCP/IP Quick Guide

http://www.javvin.com/tcpipguide.html

Ethernet Quick Guide

http://www.javvin.com/ethernetguide.

html

Packet Analyzer

http://www.javvin.com/packet.html

DiskShare

http://www.javvin.com/diskshare.html

DiskAccess

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LANsurveyor

http://www.javvin.com/LANsurveyor.

html

CyberGauge

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html

Easy Network Service

Monitor

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IGMPv3

October 2002

[ Page 4 ]

6.2.2. Denition of Group Timers ..............................................................20

6.2.3. Denition of Source Timers .............................................................20

6.3. IGMPv3 Source-Specic Forwarding Rules .......................................21

6.4. Action on Reception of Reports ..........................................................21

6.4.1. Reception of Current-State Records .................................................21

6.4.2. Reception of Filter-Mode-Change and Source-List-Change Records

.....................................................................................................................22

6.5. Switching Router Filter-Modes ...........................................................23

6.6. Action on Reception of Queries ..........................................................23

6.6.1. Timer Updates ..................................................................................23

6.6.2. Querier Election ...............................................................................24

6.6.3. Building and Sending Specic Queries ............................................24

6.6.3.1. Building and Sending Group Specic Queries .............................24

6.6.3.2. Building and Sending Group and Source Specic Queries ..........24

7. Interoperation With Older Versions of IGMP .............................................24

7.1. Query Version Distinctions .................................................................24

7.2. Group Member Behavior ....................................................................25

7.2.1. In the Presence of Older Version Queriers .......................................25

7.2.2. In the Presence of Older Version Group Members ..........................25

7.3. Multicast Router Behavior ..................................................................26

7.3.1. In the Presence of Older Version Queriers .......................................26

7.3.2. In the Presence of Older Version Group Members ..........................26

8. List of Timers, Counters and Their Default Values ....................................27

8.1. Robustness Variable ............................................................................27

8.2. Query Interval .....................................................................................27

8.3. Query Response Interval .....................................................................27

8.4. Group Membership Interval ................................................................27

8.5. Other Querier Present Interval ............................................................28

8.6. Startup Query Interval .........................................................................28

8.7. Startup Query Count ...........................................................................28

8.8. Last Member Query Interval ...............................................................28

8.9. Last Member Query Count ..................................................................28

8.10. Last Member Query Time .................................................................28

8.11. Unsolicited Report Interval ...............................................................28

8.12. Older Version Querier Present Timeout ............................................28

8.13. Older Host Present Interval ...............................................................29

8.14. Conguring Timers ...........................................................................29

8.14.1. Robustness Variable .......................................................................29

8.14.2. Query Interval ................................................................................29

8.14.3. Max Response Time .......................................................................29

9. Security Considerations ..............................................................................29

9.1. Query Message ....................................................................................30

9.2. Current-State Report messages ...........................................................30

9.3. State-Change Report Messages ...........................................................30

9.4. IPSEC Usage .......................................................................................31

10. IANA Considerations ................................................................................31

Network Dictionary

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ary.html

Network Protocols Map

http://www.javvin.com/map.html

Network Security Map

http://www.javvin.com/securitymap.

html

Wireless Communications

Technology Map

http://www.javvin.com/wirelessmap.

html

Network Protocols Hand-

book

http://www.javvin.com/model.html

TCP/IP Quick Guide

http://www.javvin.com/tcpipguide.html

Ethernet Quick Guide

http://www.javvin.com/ethernetguide.

html

Packet Analyzer

http://www.javvin.com/packet.html

DiskShare

http://www.javvin.com/diskshare.html

DiskAccess

http://www.javvin.com/diskaccess.html

LANsurveyor

http://www.javvin.com/LANsurveyor.

html

CyberGauge

http://www.javvin.com/CyberGauge.

html

Easy Network Service

Monitor

http://www.javvin.com/easy.html

Business Card Scanner

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scanner.html

Color Cards and Picture

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ner.html

Portable Document Scan-

ner

http://www.javvin.com/portablescan-

ner.html

www.javvin.com

www.networkdictionary.

com

Network Dictionary

http://www.javvin.com/networkdiction-

ary.html

Network Protocols Map

http://www.javvin.com/map.html

Network Security Map

http://www.javvin.com/securitymap.

html

Wireless Communications

Technology Map

http://www.javvin.com/wirelessmap.

html

Network Protocols Hand-

book

http://www.javvin.com/model.html

TCP/IP Quick Guide

http://www.javvin.com/tcpipguide.html

Ethernet Quick Guide

http://www.javvin.com/ethernetguide.

html

Packet Analyzer

http://www.javvin.com/packet.html

DiskShare

http://www.javvin.com/diskshare.html

DiskAccess

http://www.javvin.com/diskaccess.html

LANsurveyor

http://www.javvin.com/LANsurveyor.

html

CyberGauge

http://www.javvin.com/CyberGauge.

html

Easy Network Service

Monitor

http://www.javvin.com/easy.html

Business Card Scanner

http://www.javvin.com/businesscard-

scanner.html

Color Cards and Picture

Scanner

http://www.javvin.com/colorcardscan-

ner.html

Portable Document Scan-

ner

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ner.html

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www.networkdictionary.

com

IGMPv3

October 2002

[ Page 5 ]

11. Acknowledgments .....................................................................................31

12. Normative References ...............................................................................31

13. Informative References .............................................................................32

Appendix A. Design Rationale .......................................................................32

A.1 The Need for State-Change Messages ................................................32

A.2 Host Suppression .................................................................................32

A.3 Switching Router Filter Modes from EXCLUDE to INCLUDE ........32

Appendix B. Summary of Changes from IGMPv2 ....................................33

Authors' Addresses ...........................................................................................33

Full Copyright Statement ................................................................................34

Acknowledgement ..........................................................................................34

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