RFC 2236 - Internet Group Management Protocol, Version 2

Network Working Group
Request for Comments: 2236
Updates: 1112
Category: Standards Track
W. Fenner
Xerox PARC
November 1997

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 [email protected] and/or the author(s).

Contents

• 1. Definitions
• 2. Introduction
• 3. Protocol Description
• 4. Compatibility with IGMPv1 Routers
• 5. Compatibility with IGMPv1 Hosts
• 6. Host State Diagram
• 7. Router State Diagram
• 8. List of timers and default values
• 9. Message destinations
• 10. Security Considerations
• 11. Acknowledgments
• 12. References
• 13. Appendix I - Changes from IGMPv1
• 14. Author's Address
• 15. Full Copyright Statement