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Method and device used for synchronous ARP (Address Resolution Protocol) list item of virtual router redundancy protocol backup set

A technology of ARP entry and redundancy protocol, which is applied in the direction of digital transmission system, electrical components, transmission system, etc., and can solve problems such as dependence

Active Publication Date: 2013-03-27
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] It can be seen that when the existing technology realizes the synchronization of ARP entries of the VRRP backup group, it must rely on the improvement of the VRRP notification message, or must rely on the support of the network management system

Method used

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  • Method and device used for synchronous ARP (Address Resolution Protocol) list item of virtual router redundancy protocol backup set
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  • Method and device used for synchronous ARP (Address Resolution Protocol) list item of virtual router redundancy protocol backup set

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Embodiment Construction

[0039]In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0040] In this embodiment, the member device in the Master state in the VRRP backup group is referred to as the Master member device for short, and the member device in the Backup state in the VRRP backup group is referred to as the Backup member device for short.

[0041] When the Master member device needs to synchronize the ARP entry of any local host to the Backup member device, it first imitates the ARP packet as the local host, and sends the ARP packet of the local host contained in the ARP entry to be synchronized. The information is encapsulated in the ARP header of the fake ARP message, and then the fake ARP message is sent.

[0042] Correspondingly, after the backup member device receives the fake ARP message, it will think that the fake ARP me...

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Abstract

The invention discloses a method and a device used for synchronous ARP (Address Resolution Protocol) list item of a virtual router redundancy protocol backup set. In the invention, a Master member device is capable of imitating a local host to realize ARP spoofing for a Backup member device, and the Backup member device is promoted to carry out ARP learning through the ARP spoofing of the Backup member device, so that the Backup member device and the Master member device can establish ARP list item synchronously. Therefore, while the ARP list item is realized synchronously, the improvement of announce message for virtual router redundancy protocol is not required, and dependence on the support of network management is not required.

Description

technical field [0001] The present invention relates to VRRP (Virtual Router Redundancy Protocol, Virtual Router Redundancy Protocol) technology, in particular to a method and device for synchronizing ARP (Address Resolution Protocol, Address Resolution Protocol) entries in a VRRP backup group. Background technique [0002] A VRRP backup group consists of multiple member devices that can act as gateways. Correspondingly, each local host in a Layer 2 network (such as a LAN) only needs to regard the VRRP backup group as a virtual routing device and The routing device is configured as the default gateway. [0003] Among them, only one member device in the VRRP backup group will be in the Master (main) state, while the rest of the member devices in the VRRP backup group will be in the Backup (standby) state. [0004] The packet forwarding of the VRRP backup group between the local host and the Layer 3 network is undertaken by the member devices in the Master state; It is also ...

Claims

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Application Information

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IPC IPC(8): H04L12/713H04L12/757H04L29/12H04L45/586
Inventor 韩冰张建周黄哲
Owner NEW H3C TECH CO LTD
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