RFC4045 - Extensions to Support Efficient Carrying of Multicast Traffic in Layer-2 Tunneling Protocol (L2TP)

[RFC1661] Simpson, W., "The Point-to-Point Protocol (PPP)", STD 51,
RFC 1661, July 1994.

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.

[RFC2236] Fenner, W., "Internet Group Management Protocol, Version
2", RFC 2236, November 1997.

[RFC2661] Townsley, W., Valencia, A., Rubens, A., Pall, G., Zorn, G.,
and B. Palter, "Layer Two Tunneling Protocol "L2TP"", RFC
2661, August 1999.

[RFC2710] Deering, S., Fenner, W., and B. Haberman, "Multicast
Listener Discovery (MLD) for IPv6", RFC 2710, October 1999.

[RFC3376] Cain, B., Deering, S., Kouvelas, I., Fenner, B., and A.
Thyagarajan, "Internet Group Management Protocol, Version
3", RFC 3376, October 2002.

[RFC3438] Townsley, W., "Layer Two Tunneling Protocol (L2TP) Internet
Assigned Numbers Authority (IANA) Considerations Update",
BCP 68, RFC 3438, December 2002.

[RFC3590] Haberman, B., "Source Address Selection for the Multicast
Listener Discovery (MLD) Protocol", RFC 3590, September
2003.

[RFC3810] Vida, R. and L. Costa, "Multicast Listener Discovery
Version 2 (MLDv2) for IPv6", RFC 3810, June 2004.

11.2. Informative References

[PROXY] Fenner, B., He, H., Haberman, B., Sandick, H., "IGMP/MLD-
based Multicast Forwarding ("IGMP/MLD Proxying")", Work in
Progress.

12. Acknowledgements

Thanks to Christian Jacquenet for all the corrections done on this
document and his precious advice, to Pierre Levis for his
contribution about IGMP, to Francis Houllier for PPP considerations,
and to Xavier Vinet for his input about thresholds. Many thanks to
W. Mark Townsley, Isidor Kouvelas, and Brian Haberman for their
highly valuable input on protocol definition.

Appendix A. Examples of Group States Determination

*Example 1:

All users are managed in the same control connection.

Users {1, 2, 3} subscribe to (Group G1, EXCLUDE {})
Users {3, 4, 5} subscribe to (Group G2, EXCLUDE {})

Group states for this L2TP tunnel will be:

(G1, EXCLUDE, {})
(G2, EXCLUDE, {})

Therefore, two replication contexts will be created:

-RC1:
(*, G1) packets, Multicast Session MS1, OSL = 1, 2, 3
-RC2:
(*, G2) packets, Multicast Session MS2, OSL = 3, 4, 5

*Example 2:

All users are managed in the same control connection.

Users {1, 2, 3} subscribe to (Group G1, INCLUDE {S1})

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