High speed cache management unit for use in a bridge/router

DC
  • US 5,978,951 A
  • Filed: 09/11/1997
  • Issued: 11/02/1999
  • Est. Priority Date: 09/11/1997
  • Status: Expired due to Term
First Claim
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1. A method for selecting an output port eligible to be used for transmission of a frame received at a computer network device, wherein said computer network device has at least one input port and a plurality of output ports and said received frame has a source address and a received destination address, said method comprising the steps of:

  • receiving said frame at one of said at least one input port of said computer network device;

    parsing said received destination address from said received frame;

    processing said received destination address with a code generator to generate a coded address;

    comparing said coded address to a value associated with a row within a cache;

    in the event of a match between said coded address and said value associated with said row, comparing said received destination address with a cached destination address associated with a first entry in said row;

    in the event of a match between said received destination address and said cached destination address associated with said first entry, reading a port mask associated with said first entry to identify at least one port from said plurality of output ports which is eligible for transmission of said received frame.

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