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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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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 virtual gateway device's IP address as the default gateway address. 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 conference services are widely deployed. 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. A common method to improve network reliability is to configure multiple egress gateways. 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. The virtual router IP address is configured as the default gateway address. 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 the Ethernet, 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: 2019-08-09

Document ID: EDOC1000041694

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