Multiplex communications – Wide area network – Packet switching
Patent
1992-06-18
1994-05-03
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 941, H04J 326, H04L 1256
Patent
active
053094336
ABSTRACT:
A packet communications system provides for point-to-point packet routing and multicast packet routing to limited subsets of nodes in the network, using a routing field in the packet header which is processed according to two different protocols. A third protocol is provided in which a packet can be multicast to the limited subset even when launched from a node which is not a member of the subset. The routing field includes a first portion which contains the route labels necessary to deliver the packet to the multicast subset. A second portion of the routing field contains the multicast subset identifier which can then be used to deliver the packet to all of the members of the multicast subset. Provision is made to backtrack deliver the packet to the last node identified before the multicast subset if that last node is itself a member of the subset.
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Cidon Israel
Davenport David W.
Derby Jeffrey H.
Dudley John G.
Gopal Inder S.
International Business Machines Corp.
Marcelo Melvin
Olms Douglas W.
Woods Gerald R.
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