I-D ACTION:draft-boudani-gxcast-00.txt

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	Title		: GXcast: Generalized Explicit Multicast Routing 
                          Protocol
	Author(s)	: A. Boudani et al.
	Filename	: draft-boudani-gxcast-00.txt
	Pages		: 7
	Date		: 2003-6-23
	
Recently several multicast mechanisms were proposed that scale better
with the number of multicast groups than traditional multicast does.
These proposals are known as small group multicast (SGM) or explicit
multicast (Xcast). Explicit multicast protocols, such as the Xcast 
protocol, encode the list of group members in the Xcast header of 
every packet. If the number of members in a group increases, routers
may need to fragment an Xcast packet. Fragmented packets may not be 
identified as Xcast packets by routers. In this paper, we show that 
the Xcast protocol does not support the IP fragmentation and we show
also that avoiding fragmentation induces hard-coded limits inside the
protocol itself in terms of group size. First, we describe the Xcast
protocol, the Xcast+ protocol (which is an extension of Xcast) and we
compare these two protocols with traditional multicast protocols.We
propose then a generalized version of the Xcast protocol, called
GXcast, intended to permit the Xcast packets fragmentation and to
support the increasing in the number of members in a multicast
group.

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