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Address filter unit for carrying out address filter processing among plurality of networks and method thereof

  • US 5,210,748 A
  • Filed: 02/04/1991
  • Issued: 05/11/1993
  • Est. Priority Date: 02/09/1990
  • Status: Expired due to Fees
First Claim
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1. An address filter unit for carrying out an address filter processing between a plurality of networks by using address information extracted from an incoming information frame and registered in an entry table, said address filter unit comprising:

  • timers corresponding to each registration of address information;

    timer updating means for sequentially and intermittently advancing each timer value;

    starting means for starting said timer updating means at a predetermined cycle Δ

    T, wherein said timer updating means intermittently advances each timer value at a time interval Δ

    t, where Δ

    t is less than or equal to Δ

    T divided by a maximum registration number in the entry table; and

    means for deleting the registration from said entry table of address information corresponding to said timers when its corresponding timer value becomes equal to or greater than a predetermined value.

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