Method And Systems To Reduce Filter Engine Rules For Network Packet Forwarding Systems
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United States of America Patent
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Issued Date -
Feb 16, 2017
app pub date -
Aug 12, 2015
filing date -
Aug 12, 2015
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Abstract
Methods and systems to reduce filter engine rules for network packet forwarding systems are disclosed. In part, the disclosed embodiments process packet filters to identify certain properties which, if present, allow for techniques to be applied to avoid generating rules that do not contribute to the real-time operation of the packet forwarding system. For example, generation of filter engine rules for user-defined filters involving overlapping and mutually exclusive filter conditions are streamlined within a packet forwarding system by removing filter expressions that are not useful, such as unnecessary expressions and redundant expressions. By identifying and removing such not useful expressions, the disclosed embodiments reduce the time required to generate filter engine forwarding rules, reduce the resulting space required to store the these rules, and potentially allow increases in the numbers and complexities of packet filters applied to network packets to be forwarded by a packet forwarding system.
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