Performing a multi-stage lookup to classify packets

Some embodiments provide a method for a forwarding element that forwards packets. The method receives a packet. The method performs a first stage lookup of a hash table for a first hash of a first set of header fields and un-wildcards bits of a wildcard mask that corresponds to the first set of head...

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Bibliographic Details
Main Authors Jackson Ethan J, Rajahalme Jarno
Format Patent
LanguageEnglish
Published 06.06.2017
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:Some embodiments provide a method for a forwarding element that forwards packets. The method receives a packet. The method performs a first stage lookup of a hash table for a first hash of a first set of header fields and un-wildcards bits of a wildcard mask that corresponds to the first set of header fields. If a matching hash is found in the first stage lookup, the method performs a second stage lookup of the hash table for a second hash of a second set of header fields and un-wildcards bits of the wildcard mask that corresponds to the second set of header fields. The method identifies a matching rule for the packet. The method generates a flow based on the matching rule and the wildcard mask, wherein the flow is used to process each other packets that match each bit which is un-wildcarded.
Bibliography:Application Number: US201414487060