Method for realizing longest prifix address route search using sectioned compressed list

A longest prefix and routing technology, applied in the field of data communication, can solve the problems of complex longest prefix matching search, increased processor burden, and affecting router performance, etc.

Active Publication Date: 2008-03-12
INST OF COMPUTING TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0003] Due to the complexity of the longest prefix matching search, the burden on the processor is greatly increased; coupled with the continuous improvement of the network's requirements for router forwarding speed, route search has become one of the main bottlenecks affecting router performance

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  • Method for realizing longest prifix address route search using sectioned compressed list
  • Method for realizing longest prifix address route search using sectioned compressed list
  • Method for realizing longest prifix address route search using sectioned compressed list

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Embodiment Construction

[0063] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0064] In the 64K segment table and the compression offset table, each field is initialized to all 1 values, which means invalid (except for the entry width field of the compression offset table). When searching, if the segment routing index field value in the 64K segment table is all 1, it indicates an invalid route; the compression offset table pointer field value in the 64K segment table is all 1, indicating that there is no compression offset table in this segment; If the value of an entry in the table is all 1s, it means that the corresponding next-hop route index value is a segment route index, and formula 4 is not used for calculation.

[0065] During specific implementation, firstly, the bit width of the routing r...

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Abstract

This invention relates to a method for realizing the longest prefix address route look up which sets up two stages of route information lists: a 64 segment list and a compressed offset list, among which, the route index value in the offset list is compressed to the difference between the said index value and the primary route index for storing route look-up information. When looking up, high 16 order of the being looked-up target IPV4 address is used as the index value to position the item in 64k segment list and judge if the compressed offset list pointer is invalid, if so, the route index is the next jump route index value corresponding to IPV 4 address, if not, the pointer value, primary value and width corresponding to compressed offset list are got to get the next jump route index value of IPV4by accessing offset list items with the low 16 order of the IPV4.

Description

technical field [0001] The invention relates to the technical field of data communication. In particular, a method for realizing routing lookup of IPv4 longest prefix address by using segmentation and compression technology. The method can be used in routers, layer-3 switches, access servers and other devices in the IPv4 Internet that need to search for IPv4 address routing. Background technique [0002] Route lookup is one of the basic functions of routers, Layer 3 switches and other devices. The IP address is composed of <network identifier, host identifier>, and the forwarding of IP packets is performed according to the network identifier. In the early days, IP addresses were fixed at 8, 16, and 24 bits according to the length of the network identifier, corresponding to class A, B, and C addresses respectively. Classless Inter-Domain Routing (CIDR) allows address aggregation of any length, so that the network identification length of the IP address is no longer l...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/54H04L12/28G06F17/30H04L45/748
Inventor 徐宇锋李华伟宫曙光刘彤
Owner INST OF COMPUTING TECH CHINESE ACAD OF SCI
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