Patent Document ID: 9848068
Application ID: 13863733

Base Claim:
1. A method for providing a parser by a network node that includes a table defining a plurality of rules and a plurality of match fields required for extraction from an incoming data packet header in order to apply each of the respective rules, the method comprising: determining at least one occurrence in the table of a first match field that requires extraction; and determining a parser for use in accordance with the at least one determined occurrence of the first match field, the first match field corresponding to a field in the incoming data packet header, wherein the parser, when in use, is configured to extract only match fields for which an occurrence is determined.

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Claim 19:
19. The method of claim 1 , further comprising, responsive to the determination of the at least one occurrence of the first match field, using the determined parser to read the first match field from the incoming data packet.