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CLI-based Configuration Guide - Reliability

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document provides guidance for configuring reliability services, including interface backup, BFD, VRRP, and EFM.
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Overview of VRRP

Overview of VRRP

This section describes the definition and functions of the Virtual Router Redundancy Protocol (VRRP).


VRRP groups multiple routing devices into a virtual router and uses the virtual gateway device's IP address as the default gateway address. When the gateway fails, VRRP selects a new gateway to transmit service traffic to ensure reliable communication.


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

Generally, all hosts on the same network segment are configured with 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, hosts with the same default route cannot communicate with external networks. A common method to improve network reliability is to configure multiple egress gateways. However, route selection between the gateways becomes an issue.

VRRP resolves this issue. VRRP virtualizes multiple routing devices into a virtual router without changing the networking. The virtual router IP address is configured as the default gateway address. When the gateway fails, VRRP selects a new gateway to transmit service traffic to ensure reliable communication.


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

Updated: 2019-08-12

Document ID: EDOC1100034076

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