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Switch based network architecture for IP multicast and integrated services

  • US 6,671,276 B1
  • Filed: 11/18/1997
  • Issued: 12/30/2003
  • Est. Priority Date: 11/18/1997
  • Status: Expired due to Term
First Claim
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1. A method for mapping quality of service based internetworking protocol (IP) multicast in a network architecture, said IP multicast supporting at least one multicast group, said network architecture comprising an asynchronous transfer mode (ATM) cloud including a plurality of logical IP subnets, a plurality of multicast switches and a plurality of local ATM hosts, said multicast switches communicating using ATM protocols, wherein one of said plurality of multicast switches is located in each of said logical IP subnets and at least one of said local ATM hosts is located in each of said logical IP subnets, said method comprising the steps of:

  • forming an intra logical IP subnet control tree in each of said logical IP subnets for communication between said multicast switches and said ATM hosts;

    forming an inter logical IP subnet control tree for providing shortcut routing for inter logical IP subnet multicast traffic; and

    for each of said at least one multicast group, forming a best effort point to point data virtual circuit between one of said ATM hosts sending multicast data and one of said multicast switches located in one of said logical IP subnets in which said one of said ATM hosts sending multicast data is disposed;

    forming a best effort intra logical IP subnet data tree in each of said logical IP subnets;

    forming a best effort inter logical IP subnet data tree, wherein said best effort inter logical IP subnet data tree may be concatenated with said best effort intra logical IP subnet data trees, thereby forming shortcuts through said multicast switches for routing inter logical IP subnet multicast traffic;

    upgrading at least one branch of at least one of said best effort intra logical IP subnet data trees in said logical IP subnets to be a quality of service intra logical IP subnet data tree for transmitting multicast data;

    upgrading said best effort inter logical IP subnet data tree to a quality of service inter logical IP subnet data tree for transmitting multicast data;

    concatenating said quality of service intra logical IP subnet data trees with said quality of service inter logical IP subnet data tree and any remaining of said best effort intra logical IP subnet data trees, thereby forming a quality of service based multicast tree.

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