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Configuration Guide - Reliability

S2720, S5700, and S6720 V200R013C00

This document describes the configurations of Reliability, including BFD Configuration, VRRP Configuration, DLDP Configuration, Smart Link and Monitor Link Configuration, MAC Swap Loopback Configuration, EFM Configuration, CFM Configuration, Y.1731 Configuration.
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Overview of VRRP

Overview of VRRP


VRRP groups multiple routing devices into a virtual router and uses the virtual router'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 more diversified, various value-added services (VASs) such as Internet Protocol television (IPTV) and video conferencing have become increasingly widespread. However, to ensure these services are not affected by network disconnections, users require a more reliable network infrastructure.

Generally, all hosts on one network segment are configured with the same default route, which has the gateway address as the next hop address. The hosts use the default route to send packets to the gateway, which forwards the packets to other network segments. When the gateway fails, all hosts on this network segment 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 by virtualizing 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, ensuring services are uninterrupted when the gateway fails without modifying host and gateway configurations.

Updated: 2019-04-04

Document ID: EDOC1100065682

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