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IP multicast communication system

  • US 20050111474A1
  • Filed: 12/30/2004
  • Published: 05/26/2005
  • Est. Priority Date: 10/31/2002
  • Status: Abandoned Application
First Claim
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1. An IP multicast communication system, comprising:

  • a layer-2 switch accommodating a plurality of recipients capable of dynamically joining or not joining a multicast group;

    a layer-3 switch, for a subnetwork, receiving IP multicast data sent from a sender through an IP network and distributing, through the layer-2 switch subordinate to the layer-3 switch, the received IP multicast data to a plurality of authorized recipients joining the multicast group; and

    a controller collectively managing recipient management information for authentication of the recipients obtained according to an Internet Group Management Protocol IGMP;

    wherein the layer-3 switch checking the recipients for authentication on the basis of recipient management information for the own subnetwork that is contained in the recipient management information collectively managed by the controller, and the layer-2 switch ceasing transfer of the IP multicast data to a recipient that is judged by the layer-3 switch as having made unauthorized access.

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