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公开(公告)号：CA2094410A1
公开(公告)日：1993-12-19
申请号：CA2094410
申请日：1993-04-20
Applicant: IBM
Inventor： AUERBACH JOSHUA S , DRAKE JOHN E JR , GOPAL PRABANDHAM M , HERVATIC ELIZABETH A , KAPLAN MARC A , KUTTEN SHAY , PETERS MARCIA L , WARD MICHAEL J
Abstract: A multinode, multicast communications network has a distributed control for the creation, administration and operational mode selection operative in each of the nodes of the network. Each node is provided with a Set Manager for controlling either creation of, administration or access to a set of users to whom a multicast is to be directed. The Set Manager maintains a record of the local membership of all users associated with the node in which the Set Manager resides. A given Set Manager for each designated set of users is assigned the task of being the Set Leader to maintain membership information about the entire set of users in the multicast group. One of the Set Managers in the communications network is designated to be the Registrar which maintains a list of all the Set Leaders in the network. The Registrar insures that there is one and only one Set Leader for each set of users, answers inquiries about the membership of the sets and directs inquiries to appropriate Set Leaders if necessary. All of the set creation, administration and control functions can therefore be carried out by any node of the system and provision is made to assume the function at a new node when failure or partition in the network occurs.
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公开(公告)号：CA2100539A1
公开(公告)日：1994-05-20
申请号：CA2100539
申请日：1993-07-14
Applicant: IBM
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公开(公告)号：CA2094409A1
公开(公告)日：1993-12-19
申请号：CA2094409
申请日：1993-04-20
Applicant: IBM
Inventor： AUERBACH JOSHUA S , CHOW CHEE-SENG , DRAKE JOHN E JR , GOPAL PRABANDHAM M , HERVATIC ELIZABETH A , KAPLAN MARC A , PETERS MARCIA L , WARD MICHAEL J
Abstract: In a multicast network communication system, administration of the communication path making up the multicast tree itself has been separated from control and administration of the network. Creation of a multicast distribution tree and control over the membership thereof, is separately controlled independently from the creation and use of the tree transmission path used to communicate among the members of a multicast set. Transmission distribution trees are set up when a transmission request is received and the properties of the transmission path that is required are known. Transmission paths are created and controlled by all nodes in the communications system, each node having necessary control code and processors for responding to requests from set members to transmit a message to groups of users by creating and activating the necessary tree communication path distribution linkages. A distribution tree is created by the Tree Leader by generating a tree address using a random number generator. A tree address correlator is generated utilizing network and node identifiers unique for the network, and a list of subnodes or users connected for each member of the multicast tree set is generated. Using this information, a tree distribution path is computed to cover all of the subnodes required and a tree set up request message is sent by the Tree Leader along a computed path to each involved subnode. Each subnode returns a message indicating whether the tree address is already in use or is available for use. Successfully negotiated tree addresses are marked at the path link initiation and termination points at each node through the network.
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公开(公告)号：CA2094405A1
公开(公告)日：1993-12-19
申请号：CA2094405
申请日：1993-04-20
Applicant: IBM
Inventor： SIDON ISRAEL , DAVENPORT DAVID W , DERBY JEFFREY H , DUDLEY JOHN G , GOPAL INDER S , JANNIELLO JAMES P , KAPLAN MARC A , KOPERDA FRANK R , KUTTEN SHAY , POTTER KENNETH H JR
Abstract: A packet communications system provides for point-to-point packet routing and broadcast 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 broadcast 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 broadcast subset. A second portion of the routing field contains the broadcast subset identifier which can then be used to deliver the packet to all of the members of the broadcast subset. Provision is made to backtrack deliver the packet to the last node identified before the broadcast subset if that last node is itself a member of the subset.
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