A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Limited Core Fix (LCF) Multicast
Author(s) : L. Flynn, et al.
Filename : draft-flynn-rtgwg-lcf-00.txt
Pages : 10
Date : 2005-8-22
This Internet Draft describes the Limited Core Fix (LCF) multicast t
protocol for IP multicast routing. Since the existing multicast
protocols rely on RFC 1112 as their foundation, multicast is
characterized by a host join attribute not involving knowledge by the
source. Evolving uses of multicast may be seen to require joins on a
more qualified basis and may require knowledge of such joins by the
source. An example, is IP wireless multicast in which the source
(i.e., service provider) will want to charge for specific channels
(in the TV sense) and limit transmission to those hosts paying for
the service. Other qualifications may be needed in providing high
quality broadband service. Other examples for which a qualification-
based multicast could be developed include bandwidth needs, jitter or
latency requirements, or restrictions on who gets particular
transmissions. In order to accommodate these requirements, or a
dynamic group membership for collaboration activities. The
qualification-based multicast described in LCF uses a depth-first-
search technique to find new routes to a multicast source when
needed, an attribute that minimizes transmission bandwidth to update
the tree and utilizes tables significantly smaller than those of
normal multicast. The draft discusses the notion of qualification-
based multicast as a generalization of Quality-of-Service (QoS)
routing for multicast. LCF can be used to build multicast trees in a
sparse-mode fashion and implements receiver-initiated multicast
repair for damaged multicast trees.
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