Virtual egress packet classification at ingress

  • US 6,763,394 B2
  • Filed: 08/22/2001
  • Issued: 07/13/2004
  • Est. Priority Date: 08/22/2001
  • Status: Active Grant
First Claim
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1. In a network packet router having one or more ingress and egress ports, a system implemented at an ingress port for egress pass/drop determination for packets, comprising:

  • a rule set comprising a first lookup table including header combinations and values for which a pass/drop decision may be applied, the set including an egress port identity for each header combination and value set;

    a second lookup table for accomplishing ingress rule determinations without egress port numbers; and

    a mechanism noting pertinent headers of a specific incoming packet, and an egress port to which the packet is to be sent, comparing, in the fast and second lookup tables, the headers with rules in the rule set, and returning a determination of a rule to be applied.

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