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1 Introduction

VRRP

Entry-ID: 109798556, V1.0, 09/2021

1 Introduction

1.1 Overview

You have been tasked with ensuring reliability and operational security between

different subnets. To accomplish this task, you need routers between the network

interfaces.

Problem

The router in the network has a technical error. All servers in subnet B are no

longer reachable. Single points of failure which entail the failure of the entire

system must be avoided.

Figure 1-1

Subnet A

Router 1

PC 1

PC 3

PC 2

Server 3

Server 2

Server 1

Subnet B

Solution

To circumvent single points of failure, routers can be set up redundantly. The

underlying principle is the Virtual Router Redundancy Protocol (VRRP). VRRP

belongs to the first-hop redundancy protocols which are used in critical

infrastructure, such as servers, to ensure their availability. The protocol serves to

improve the availability of gateways in local networks by means of redundant

routers.

Figure 1-2