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Apparatus and method for learning and filtering destination and source addresses in a local area network system

  • US 5,136,580 A
  • Filed: 05/16/1990
  • Issued: 08/04/1992
  • Est. Priority Date: 05/16/1990
  • Status: Expired due to Term
First Claim
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1. An apparatus for transmitting information in packets between at least first and second data communication systems, each of said systems comprising a plurality of nodes, each of said nodes being adapted to receive and transmit packets of information, said packets of information each comprising destination address information, source address information and data, the apparatus comprising:

  • means for receiving a packet from the first of said data communications systems;

    means for capturing destination address information from said received packet;

    means for storing said captured destination address information;

    means for comparing said captured destination address information to previously stored source addresses;

    means for capturing source address information from said received packet; and

    means for storing said captured source address information;

    wherein the comparison of said captured destination address information to previously stored source address information is completed before capturing said source address information from said received packet; and

    said packet received from said first data communications system is transmitted to said second data communications system only if said compared destination address information is not found by said means for comparing said captured destination address information to said previously stored source addresses.

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