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Internet Group Management Protocol, Version 2 (RFC2236)

IP.com Disclosure Number: IPCOM000002795D
Original Publication Date: 1997-Nov-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 18 page(s) / 47K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. Fenner: AUTHOR

Abstract

This memo documents IGMPv2, used by IP hosts to report their multicast group memberships to routers. It updates STD 5, RFC 1112.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 6% of the total text.

Network Working Group W. Fenner

Request for Comments: 2236 Xerox PARC

Updates: 1112 November 1997

Category: Standards Track

Internet Group Management Protocol, Version 2

Status of this Memo

This document specifies 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

Official Protocol Standards" (STD 1) for the standardization state

and status of this protocol. Distribution of this memo is unlimited.

Copyright Notice

Copyright (C) The Internet Society (1997). All Rights Reserved.

Abstract

This memo documents IGMPv2, used by IP hosts to report their

multicast group memberships to routers. It updates STD 5, RFC 1112.

IGMPv2 allows group membership termination to be quickly reported to

the routing protocol, which is important for high-bandwidth multicast

groups and/or subnets with highly volatile group membership.

This document is a product of the Inter-Domain Multicast Routing

working group within the Internet Engineering Task Force. Comments

are solicited and should be addressed to the working group's mailing

list at idmr@cs.ucl.ac.uk and/or the author(s).

1. Definitions

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

document are to be interpreted as described in RFC 2119 [RFC 2119].

2. Introduction

The Internet Group Management Protocol (IGMP) is used by IP hosts to

report their multicast group memberships to any immediately-

neighboring multicast routers. This memo describes only the use of

IGMP between hosts and routers to determine group membership.

Routers that are members of multicast groups are expected to behave

as hosts as well as routers, and may even respond to their own

queries. IGMP may also be used between routers, but such use is not

specified here.

Like ICMP, IGMP is a integral part of IP. It is required to be

implemented by all hosts wishing to receive IP multicasts. IGMP

messages are encapsulated in IP datagrams, with an IP protocol number

of 2. All IGMP messages described in this document are sent with IP

TTL 1, and contain the IP Router Alert option [RFC 2113] in their IP

header. All IGMP messages of concern to hosts have the following

format:

0 1 2 3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Type | Max Resp Time | Checksum |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

| Group Address |

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

2.1. T...