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Efficient Access to a Multicast Set via a Shared Distribution Tree

IP.com Disclosure Number: IPCOM000109457D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-24
Document File: 1 page(s) / 69K

Publishing Venue

IBM

Related People

Auerbach, J: AUTHOR [+7]

Abstract

This article presents a mechanism whereby a user can obtain access to a multicast set without having to create its own distribution tree. (Distribution trees are used in a network to send multicast packets to a multicast set.) It also enables efficient access to a multicast set's distribution tree by placing the necessary information in a distinguished node termed the registrar, and allows a multicast set's set leader to control access to its distribution tree.

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Efficient Access to a Multicast Set via a Shared Distribution Tree

      This article presents a mechanism whereby a user can obtain
access to a multicast set without having to create its own
distribution tree.  (Distribution trees are used in a network to send
multicast packets to a multicast set.)  It also enables efficient
access to a  multicast set's distribution tree by placing the
necessary information in a distinguished node termed the registrar,
and allows a multicast set's set leader to control access to its
distribution tree.

      Each node contains a set manager, which  acts on behalf of
users located in that node.  A set leader is a distinguished set
manager that maintains, for a given multicast set, the complete
membership information for that multicast set, and creates a
distribution tree called the default-distribution tree.

      A set manager obtains the default-distribution tree information
from the registrar and, if the tree is enabled, computes a path to
the set leader's node.  Multicast packets may then be sent to that
node, which will forward them on the defaultdistribution tree to the
members of the multicast set.

      A default-distribution tree is particularly useful for
situations in which a user wants to send a simple query to multicast
set (e.g., a query to a  distributed database).  In these situations,
the time and cost of creating a distribution tree for such a query
would make that solution impractical.

     ...