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Method and device for updating arp entry

An ARP table entry and update method technology, applied in the field of ARP table entry update method and device, can solve problems such as packet loss of packets, reduce equipment forwarding performance, etc., and achieve the effect of ensuring normal communication

Active Publication Date: 2019-11-12
HANGZHOU DPTECH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when it is learned that a certain network device in the ARP entry changes (for example, the state of the interface of the network device changes from Down to Up), if the ARP entry is not updated in time and accurately, the data packet will be forwarded later. When , there will be packet loss and other situations, which will reduce the forwarding performance of the device.

Method used

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  • Method and device for updating arp entry
  • Method and device for updating arp entry
  • Method and device for updating arp entry

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Embodiment Construction

[0022] In order to make the purpose, technical solution and advantages of the present application clearer, the solution of the present application will be further described in detail below with reference to the accompanying drawings.

[0023] figure 1 It is a schematic diagram of a networking environment where the method for updating an ARP entry provided by the embodiment of the present invention is applied. It includes multiple network devices (for example, device A and device B), and each network device has multiple ports, for example, device A includes ports Port1 and Port2. Port1 can communicate with Port3, and Port2 can communicate with Port4. In this application scenario, Port3 and Port4 of device B use different network cards, have the same IP address, and have priority. For example, the priority of Port3 is higher than that of Port4. Device B can use Port3 with higher priority. Communicate with external devices.

[0024] In the prior art, when both Port1 and Port2 ...

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Abstract

The present invention provides a method and device for updating an ARP entry, wherein the method includes: when the state of a port of the network device changes, acquiring the Vlan ID of the port whose state changes; The ARP information corresponding to the VlanID; generate an ARP request message according to the ARP information, and broadcast it; if a response message is received, the ARP entry is performed according to the port receiving the response message on the network device renew. The invention can timely update the ARP entries saved by the network equipment, thereby ensuring the normal communication between the equipment.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an ARP (Address Resolution Protocol, Address Resolution Protocol) entry update method and device. Background technique [0002] As the services carried by the network become increasingly complex, the neighbors of network devices change more frequently, and the flexible update of ARP entries has become a new premise to ensure the normal processing of network services. [0003] In the prior art, after a network device receives an ARP message, an application program of the network device analyzes the received ARP message to perform ARP learning and correspondingly updates an ARP entry. For subsequent received data packets, if the information corresponding to the destination IP address is found in the ARP entry, and it is determined that ARP learning has been performed, the data packets will be encapsulated according to certain rules, and then sent from the correspondi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/12H04L12/751H04L45/02
CPCH04L45/02H04L61/103
Inventor 刘成乾
Owner HANGZHOU DPTECH TECH