Name: draft-boudani-gxcast-02
Title: GXcast: Generalized Explicit Multicast Routing Protocol
State: Active
Authors: Ali Boudani
Group: Individual Submissions (none)
Date: 2004-10-11
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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