A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Explicit Multicast (Xcast) Basic Specification
Author(s) : R. Boivie, et al.
Filename : draft-ooms-xcast-basic-spec-08.txt
Pages : 33
Date : 2005-7-22
Multicast has become increasingly important with the emergence of
network-based applications such as IP telephony and video
conferencing. The Internet community has done a significant amount of
work on IP multicast over the last decade [1075, 2201, 2236, DEER,
DEE2, FARI, HOLB, MBONE, PERL].
However, while traditional multicast schemes are scalable in the
sense that they can support very large multicast groups, there are
scalability issues when a network needs to support a very large
number of distinct multicast groups.
This document describes a new scheme for multicast - named Explicit
Multi-unicast (Xcast) - that complements the existing schemes.
Whereas the existing schemes can support a limited number of very
large multicast sessions, Xcast can support a very large number of
small multicast sessions. This is achieved by explicitly encoding
the list of destinations in the data packets, instead of using a
multicast address.
The co-operation of Xcast - a data plane mechanism - with existing
control planes is described and scenarios for gradual deployment are
investigated. Encodings for both IPv4 and IPv6 are proposed.
This document discusses concepts and optional ideas in several areas
and does not provide a complete technical specification at this
point. However, significant experience has been obtained in
implementation, in interoperability testing and in operational
experiments. The details of these experiments will be discussed in a
forthcoming informational RFC [BCP-2004].
This draft combines with previous drafts: [BOIV], [IMAI], [OOMS].
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ooms-xcast-basic-spec-08.txt
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