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A method for processing, searching, adding and deleting routing prefixes

A deletion method and prefix technology, applied in the field of network communication, can solve the problems of memory consumption and low cost, and achieve the effect of avoiding backtracking operations

Active Publication Date: 2015-09-09
IPLOOK NETWORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the existing technical problems of high-speed search and update, low memory consumption, and low cost in the existing routing table implementation method, the present invention provides a processing method for routing prefixes, including searching, adding, and deleting. wait for operation

Method used

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  • A method for processing, searching, adding and deleting routing prefixes
  • A method for processing, searching, adding and deleting routing prefixes
  • A method for processing, searching, adding and deleting routing prefixes

Examples

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example

[0158] Example: Implementing an IPV4 routing table based on a 256-branch Trie tree

[0159] 1. In the example, a multi-branch Trie tree with an equal step size of 8 (that is, 256) is used to realize the rapid update and search of the IPV4 routing table prefix.

[0160] 2. The data structure adopts the above-mentioned Table 1-Table 3.

[0161] 3. Add process:

[0162] According to the implementation method of adding a routing prefix above, take adding the following routing entry as an example:

[0163] route entry prefix

routing table entry index

192.168.1.1 / 0 is 0.0.0.0

N0

192.168.1.1 / 1 is 128.0.0.0

N1

……

……

192.168.1.1 / 10 is 192.128.0.0

Na

192.168.1.1 / 11 is 192.160.0.0

Nb

……

……

192.168.1.1 / 24 is 192.168.1.0

N18

……

……

192.168.1.1 / 31 is 192.168.1.0

N1f

192.168.1.1 / 32 is 192.168.1.1

N20

[0164] Table 4

[0165] The added routing table memory map i...

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Abstract

The invention provides a route prefix processing, lookup, adding and deleting method. A multi-way Trie tree is utilized to artfully design a Trie node data structure, and the technical problems that the traditional routing table realization method can not satisfy the quick route lookup requirement, the memory access times are reduced, the cost of construction is high and the use efficiency is low can be solved by a prefix list item storage data structure and algorithm, a high-speed longest route prefix lookup method, a quick route prefix increasing method and a quick route prefix deleting method. The route prefix processing, lookup, adding and deleting method has the advantages of high lookup speed, high update speed and good use benefit.

Description

technical field [0001] The invention belongs to the technical field of network communication, and in particular relates to a method for processing, searching, adding and deleting routing prefixes. Background technique [0002] With the rapid development of the Internet, core routers and network devices with routing and forwarding functions have an interface bandwidth of 10G or even 40G or more, and the capacity of IPV4FIB entries is also on the order of one million entries, which requires the routing table to support large capacity and the search speed is very fast; The addition and deletion operations of the routing table are also very frequent. In the worst case, the internal routing changes can occur hundreds of times per second. In order to adapt to the rapid dynamic changes of the routing table items and ensure the correctness of the search, this requires that the routing table should also have a good refresh speed. [0003] Route lookup, since CIDR (Classless Inter-Do...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/745H04L45/748
Inventor 王辉
Owner IPLOOK NETWORKS CO LTD