Merging filter rules to reduce forwarding path lookup cycles

Details Merging filter rules to reduce forwarding path lookup cycles Merging filter rules to reduce forwarding path lookup cycles

2007-08-10

2011-11-22

Zand, Kambiz (Department: 2434)

Information security

Access control or authentication

Network

Reexamination Certificate

active

08065721

ABSTRACT:
The invention is directed to techniques for managing filter rules applied to network traffic at a network device. A network device merges multiple filter rules associated with separate filter matching modules to reduce lookup cycles in a forwarding path of the network device. The network device may thus simultaneously apply multiple filter rules in a reduced number of clock cycles. A network device comprises an interface that receives packets from a network, a filter memory that stores a plurality of filters, and a plurality of filter matching modules that apply the filters to packets in a forwarding path of the network device. A filter control module merges two or more filters each associated with a different one of the filter matching modules into a single merged filter, and stores the merged filter to the filter memory. The network device applies the merged filter to packets in the forwarding path.

REFERENCES:
patent: 6631419 (2003-10-01), Greene
patent: 7054930 (2006-05-01), Cheriton
patent: 2007/0039044 (2007-02-01), Moonen

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