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Fat AP and Cloud AP V200R008C00 CLI-based Configuration Guide

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Introduction to VRRP

Introduction to VRRP

This section describes the definition and functions of VRRP.

Definition

The Virtual Router Redundancy Protocol (VRRP) groups multiple routing devices into a virtual router and uses the next hop address in the default route of hosts as the IP address of the virtual router. When the gateway becomes faulty, VRRP selects a new gateway to transmit service traffic to ensure reliable communication.

Purpose

As networks rapidly develop and applications become diversified, various value-added services, such as IPTV and video conferencing are widely used. Demands for network infrastructure reliability are increasing, especially for nonstop service transmission.

Generally, all hosts on the same network segment have the same default route with the gateway address as the next hop address. The hosts use the default route to send packets to the gateway and the gateway forwards the packets to other network segments. When the gateway fails, the hosts with the same default route cannot communicate with external networks. Configuring multiple egress gateways is a common method to improve system reliability. However, route selection between the gateways becomes an issue.

VRRP solves the problem. VRRP virtualizes multiple routing devices into a virtual router without changing the networking, and uses the next hop address in the default route of hosts as the IP address of the virtual router to implement gateway backup. When the gateway becomes faulty, VRRP selects a new gateway to transmit service traffic to ensure reliable communication.

Benefits

On a multicast or broadcast LAN such as an Ethernet network, VRRP provides a highly reliable link when the gateway becomes faulty without modifying host and gateway configurations. VRRP prevents network interruptions when a single link becomes faulty.

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Updated: 2019-01-11

Document ID: EDOC1000176006

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