Large-scale character string high-speed searching method based on TCAM

Abstract

The invention discloses a large-scale character string high-speed searching method based on a TCAM, and belongs to the field of network infrastructures. The method comprises the steps of constructionand query, during construction, a large-scale character string set is utilized to construct a tree structure, then a distinction position of two or multiple character strings is utilized to extract distinction position lists, the values corresponding to distinction positions on all assigned node paths in the tree structure according to the sequence of the distinction position lists, compression stings are constructed to serve as TCAM storage items, the divided subtree or leaf information is stored in a DRAM, and the SRAM is utilized to store the corresponding relation of the TCAM items and a DRAM address; during query, the distinction position lists are utilized to extract query character strings to generate query keywords of the TCAM, high-speed lookup features of the TCAM are utilized tolocate a subset or matching information stored in the DRAM, and high-speed matching of a large scale of character strings is achieved. By means of the large-scale character string high-speed searching method based on the TCAM, the matching speed of name prefixes is increased, and a large scale of varchar can be well disposed.

Description

technical field [0001] The present invention relates to a large-scale character string high-speed search method based on TCAM, in particular to a method for extracting bit values ​​or bit strings from a tree structure to construct a compressed bit string as a TCAM storage entry, and utilizing the characteristics of TCAM parallel search to realize The invention relates to high-speed matching of large-scale character strings, which belongs to the technical field of network infrastructure. Background technique [0002] String search algorithms are widely used in various fields of network infrastructure, and the speed of search algorithms often determines the level of network performance. Among them, the character string search plays a crucial role in the data packet forwarding process. When the router forwards the data packet, it needs to use the destination address (in the IP network) or the data name (in the information center network) to query the forwarding information base...

AI Technical Summary

Problems solved by technology

TCAM can access all entries in the table in parallel and return the query results within one clock cycle. The query speed is extremely fast, but its storage space is limited. Currently, the largest TCAM memory is only 80Mb

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