An Efficient Range Matching Method for Zero Range Expansion Based on bf_tcam
A matching method and range technology, applied in the field of high-efficiency range matching based on BF_TCAM to achieve zero range expansion, can solve the problems of high power consumption and low storage utilization, and achieve the goal of reducing power consumption, improving update performance, and reducing circuit resource overhead. Effect
Inactive Publication Date: 2018-07-06
刘航天 +1
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[0005] The technical problem to be solved by the present invention is to provide a high-efficiency range matching algorithm based on Bloom filter algorithm and TCAM to realize zero range expansion, so as to solve the problems of low storage utilization and high power consumption in the range matching method based on TCAM. Efficiency is reflected in: efficient storage, high-speed search and low power consumption
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[0035] Bloom filter algorithm introduction: Bloom Filter is a random data structure with high space efficiency. It uses bit arrays to succinctly represent a set, and can determine whether an element belongs to the set. The Bloom Filter contains an m-bit array, and each bit is set to 0 in the initial state. In order to express a set S={s1, s2,...,sn} containing n elements, Bloom Filter uses k mutually independent hash functions hash_i (i=1,2...,k) to separate each element in the set Maps into the range {1,...,m}. For any element x, the position hash_i(x) of the i-th hash function mapping will be set to 1 (1≤i≤k), such as figure 1 shown.
[0036] When judging whether s belongs to a set, apply the hash function k times to s, if all the positions of hash_i(s) are 1 (1≤i≤k), then s hits this set with a high probability, otherwise it can be determined s does not belong to this set. Such as figure 2 As shown, it can be determined that y1 is not an element in the set, and it is...
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The invention provides a BF_TCAM (Bloom Filter-Ternary Content Addressable Memory)-based high-efficiency range matching method for realizing zero range expansion. The method is used for solving the problems of low storage utilization ratio and high power consumption of existing TCAM-based range matching methods and is mainly applied to the port range matching in packet classification, the storage access address examining in storage protection and the like. The high efficiency of the method provided by the invention is embodied in the aspects of high-efficiency storage, high-speed lookup and low power consumption. The method is characterized in that the range matching process is segmented into the two steps of prefix matching and characteristic interval comparison by utilizing a SMLCP (Segmented Match on Longest Common Prefix) algorithm to ensure that the TCAM technique is conveniently used and the storage utilization ratio of the TCAM is up to 100%; a BF_TCAM module is designed according to the SMLCP algorithm, the range is classified according to the prefix length, keywords are filtered and irrelevant items are shielded from participating in the comparison by using a bloom filter, so that the power consumption is reduced by a large margin; and the circuit critical path length is reduced by using a pipeline technique, so that the lookup operation is completed in one clock period.
Description
technical field [0001] The invention relates to an efficient range matching method based on Bloom filter algorithm and TCAM (Ternary Content Addressable Memory, three-state content addressable memory) to realize zero range expansion, mainly used to solve port range matching in message classification and memory access in storage protection Address review, etc., to achieve access control, security filtering, bandwidth control and other functions, widely used in firewalls, routers, switches, distributed storage networks, trusted computing security platforms and other equipment. These applications have high requirements on search performance, and high-speed range matching is the technical support for their realization. Background technique [0002] At present, the industry generally uses TCAM to realize high-speed look-up tables. Unlike ordinary memory, which uses addresses to find content, TCAM locates addresses through content. It compares the input keyword with all table ent...
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IPC IPC(8): H04L12/743
CPCH04L45/7453Y02D30/50
Inventor 刘航天方开莎
Owner 刘航天