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IP routing search method and device

A technology of IP routing and routing, which is applied in digital transmission systems, electrical components, transmission systems, etc., and can solve problems such as large routing table entries

Active Publication Date: 2017-01-11
NEW H3C TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In addition, because the network device needs to support multiple VPN instances, each VPN instance needs to maintain an independent routing table. When the network device supports more VPN instances, the overall routing table entries of the network device will be very large.

Method used

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  • IP routing search method and device

Examples

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Embodiment Construction

[0039] Tree Bitmap (tree bitmap) is a classic routing lookup algorithm based on Multibit Trie (multibit dictionary tree), which is applied to CRS series high-end routers. In order to gain an in-depth understanding of Tree Bitmap, first introduce Unibit Trie (unit dictionary tree) and Multibit Trie.

[0040] image 3 An example diagram for Unibit Trie, such as image 3 As shown, there are 9 IPv4 prefixes P1-P9 distributed. Among them, the highest prefix node P1 of the Unibit Trie represents the prefix *, after that, the prefix Q1 represented by the left branch of the lower level of P1 is 0*, the prefix P2 represented by the right branch of the lower level of P1 is 1*, and the lower level of Q1 The prefix P3 represented by the left branch of the first level is 00*, the prefix Q2 represented by the left branch of the next level of P2 is 01*, the prefix Q3 represented by the right branch of the next level of P2 is 11*, and so on; That is to say, for any node P in the Unibit Tri...

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Abstract

The invention provides an IP routing search method and device. The method comprises the steps of establishing a multibit trie for routing distribution of an IP prefix in each VPN (Virtual Private Network), and dividing each multibit trie into multiple levels; establishing an input key for each level according to a VPN identifier and all bits of an IP address before each level when routing search is carried out on an IP address in one VPN, calculating the input key for each level by employing a Hash function of each level, and carrying out routing search by employing a data structure information pointer of a sub _Trie node corresponding to the longest Hash hit result. According to the method and the device, the IP routing search efficiency is improved.

Description

technical field [0001] The present application relates to the technical field of routing lookup, in particular to an IP routing lookup method and device. Background technique [0002] Communication between networks requires data transmission and forwarding, so one of the main functions of network equipment is to perform efficient data forwarding, and its function in the basic data plane of the Internet protocol is routing lookup, that is, according to the routing table. Prefix information, for each incoming data packet determines its next hop and outgoing port. Due to the wildcards in the routing table and the LPM (Longest Prefix Matching, longest prefix matching) problem of CIDR (Classless Inter-Domain Routing, based on Classless Inter-Domain Routing), routing lookup becomes very complicated. In addition to high performance, the LPM-based routing lookup algorithm also needs to meet the following requirements: [0003] 1. IPv4 and IPv6 dual stack [0004] Most existing al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/741H04L45/748H04L45/74H04L45/741
CPCH04L45/74H04L45/745H04L12/4641H04L45/741H04L45/7453H04L45/748
Inventor 任凯葛长忠安绍亮
Owner NEW H3C TECH CO LTD
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