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Route prefix storing, matching and updating method and device based on names

A matching method and prefix matching technology, applied in the field of computer networks, can solve the problems that cannot meet the requirements of high efficiency and high accuracy of routing addressing, and the matching time cannot be well adapted, so as to reduce the probability of conflicts and achieve high efficiency. Prefix matching, the effect of speeding up the search

Active Publication Date: 2013-12-04
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing routing addressing policy matching scheme can no longer meet the high efficiency and high accuracy requirements of routing addressing in the future network
Existing IP network prefix matching methods cannot adapt well to future content-centric networks in terms of memory and matching time

Method used

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  • Route prefix storing, matching and updating method and device based on names
  • Route prefix storing, matching and updating method and device based on names
  • Route prefix storing, matching and updating method and device based on names

Examples

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Embodiment 1

[0044] Step 11, establishing four Bloom filters, which is a schematic structural diagram of the Bloomfilter provided by the present invention. Each Bloom filter is a bitset of length m, and the bitset is initialized to 0. Calculate the number of layers L of the prefix name, if L is less than or equal to m, directly use the prefix name as the B-prefix, otherwise intercept the first m layers as the B-prefix, and the last few layers as the T-suffix. Assuming there are k hash functions, use k hash functions to calculate B-prefix into k values ​​v1=hash1(B-prefix), v2=hash2(B-prefix),...,vk=hashk(B- prefix), and finally set the values ​​of k positions of the Bloom filter corresponding to v1, v2, ..., vk to 1 to complete the insertion.

[0045] As mentioned above, the Bloom filter will conflict, that is, after calculating the B-prefix hash value of a prefix name, it is found that the k positions corresponding to the Bloom filter are not all zero, that is, some positions are shared ...

Embodiment 2

[0050] Step 13. Calculate the number of layers L of the requested name, intercept the first layer, the first two layers, ..., the first min(L, m) layers of the requested name, and use them as B-prefix_1, B-prefix_2, ..., B- prefix_min(L,m), the corresponding remaining part is used as T-suffix_1, T-suffix_2,..., T-suffix_min(L,m), B-prefix_1, B-prefix_2,..., B-prefix_min(L, m) Search in the corresponding Bloom filter in parallel, and store the search results in the stack s from large to small.

[0051] Such as Figure 5 As shown in , it is a schematic diagram of an initialized Bloom filter provided in this embodiment. In the process of searching for the requested name "www / baidu / cn / news / china / jiangsu / ", for the convenience of expression, m=5, including the following steps:

[0052]Get the first 1 layer "www / ", the first 2 layers "www / baidu / ", the first 3 layers "www / baidu / cn / ", the first 4 layers "www / baidu / cn / news / ", the first 5 layers of the requested name Layer "www / baidu...

Embodiment 3

[0063] Step 16, saving the prefix names whose prefix matches are successful in the list L;

[0064] Step 17. When the number of entries in the list L is equal to X, take out the first layer of all prefix names as B-prefix, count the number of different B-prefixes, and save each B-prefix and its number sum to the map In the table s; then, take out the first two layers of all prefix names as B-prefix, repeat the above steps until the first n layers are taken, and n is the number of layers of the prefix name with the largest number of layers;

[0065] Step 18, define the B-prefix whose number exceeds Y as the B-prefix of the prefix name with relatively high popularity, and delete their records in the corresponding Bloom filter and Trie, and rebuild a new Bloom filter and Trie, inserting the more popular prefix names into a new Bloom filter and Trie.

[0066] Such as Figure 7 As shown, it is a request name B-prefix popularity list provided in this embodiment. In this example, ...

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Abstract

The invention discloses a route prefix storing, matching and updating method and device based on names. The device comprises a Bloom filter unit, a Trie unit and a popularity counting unit. The Bloom filter unit stores the front M layers of name prefixes and performs fast prefix matching on request names arriving at a route; the Trie unit is used for storing the rear n layers of the name prefixes and performing fast suffix inquiry on the request names; The popularity counting unit is used for counting popularity of the request names and correspondingly changing storing structures of Bloom filters and Trie. Bloom filter conflict and low-internal-memory feature, quickness of Trie inquiry, parallel inquiry, counting rule of actual name prefixes, and route updating based on popularity counting are used to solve the route addressing problem based on names in a novel network system, and the requirements of low internal memory consumption, fast matching and large throughput of future networks can be satisfied.

Description

technical field [0001] The invention relates to the technical field of computer networks, in particular to a routing prefix matching method and device. Background technique [0002] With the development of the Internet, people's demand for data content itself is becoming stronger and stronger. In this context, the traditional host-centric network architecture has been difficult to meet the current development of the Internet, which led to the emergence of the next-generation network system CCN (Content-Centric Networking). Different from the traditional IP-based network system, CCN is a brand-new network system centered on content and information. It uses the name of the content required by network users to locate data resources instead of using directional IP addresses. Each data packet header in CCN carries the name of the requested content, and the forwarding table in the router is composed of several content name prefixes. When forwarding, the name of the requested cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/741H04L45/74
CPCY02B60/31Y02D30/50
Inventor 关建峰张宏科许长桥张萌权伟戴彧张朝贵韩冰洁何云航
Owner BEIJING UNIV OF POSTS & TELECOMM
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