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Method and device for expanding address resolution protocol table

A technology of address resolution protocol and extension method, applied in the field of network routing, can solve the problems that the capacity of the ARP table stored in the switching chip cannot be satisfied and the cost of the chip is high.

Inactive Publication Date: 2016-02-10
ZTE CORP
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increasing number of access users, the capacity of the switch chip to store the ARP table cannot meet this demand
The existing method is generally to replace the switching chip with a larger ARP table capacity, but this method is limited by two conditions: first, whether the chip manufacturer can provide such a product in time, and second, the cost of the chip will be high

Method used

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  • Method and device for expanding address resolution protocol table
  • Method and device for expanding address resolution protocol table
  • Method and device for expanding address resolution protocol table

Examples

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Embodiment Construction

[0024] The switch chip generally has a host routing table and a subnet routing table. The host routing table is used to store the IP address and next-hop index of the ARP table, and the subnet routing table is used to store the subnet IP address prefix and the next-hop index. The host routing table generally uses a hash algorithm, and the subnet routing table generally uses a ternary content addressable memory (TCAM, TernaryContentAddressableMemory) because it needs to match the longest route first. TCAM has the advantages of fast search speed and simple operation, but at the same time It also has obvious disadvantages: high cost, high power consumption and complex routing updates. Although the host routing table in the switch chip is relatively large, it uses the hash algorithm, which is prone to conflicts; although the subnet routing table is relatively small, it can be searched accurately. According to the characteristics of these two tables, a method and device for extendi...

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Abstract

The invention discloses a method for expanding an address resolution protocol (ARP) table. The method comprises the steps that: a CPU obtains the ARP table, and sets an IP address of the ARP table in a mainframe routing table of a switch chip; and in the case of hash (hash) conflict of the mainframe routing table, the IP address of the ARP table suffering the hash conflict is set in a subnet routing table of the switch chip. The invention further discloses a device for expanding the address resolution protocol table.

Description

technical field [0001] The invention relates to network routing technology, in particular to an address resolution protocol (ARP) table extension method and device. Background technique [0002] With the rapid development of the metropolitan area network, the bandwidth of access and aggregation network equipment is increasing, and operators require more and more users to be connected to one equipment. Access mode In addition to layer 2 (L2) access, there is also layer 3 (L3) access. For L3 access mode, access devices such as DSLAM, PON, MAN switches, etc., need to use switching chips for data aggregation and L3 forwarding. Due to the increasing number of access users, the capacity of the switching chip to store the ARP table cannot meet this demand. The existing method is generally to replace the switch chip with a larger ARP table capacity, but this method is limited by two conditions: first, whether the chip manufacturer can provide such a product in time, and second, th...

Claims

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Application Information

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IPC IPC(8): H04L12/743H04L29/12
CPCH04L61/00
Inventor 焦赵云
Owner ZTE CORP
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