3com DUA1750-2BAA01 Manual De Usuario

3Com Switch 8800 Configuration Guide 

Chapter 41  VRRP Configuration

 

41-1 

Virtual Router Redundancy Protocol (VRRP) is a fault-tolerant protocol. In general, a 

default route (for example, 10.100.10.1 as shown in the following internetworking 

diagram) will be configured for every host on a network, so that the packets destined to 

some other network segment from the host will go through the default route to the Layer 

3 Switch, implementing communication between the host and the external network. If 

Switch is down, all the hosts on this segment taking Switch as the next-hop on the 

default route will be disconnected from the external network. 

Ethernet

Switch

Host  1

Host  2

Host  3

10.100.10.7

10.100.10.8

10.100.10.9

10.100.10.1

Network

 

Figure 41-1 Network diagram for LAN  

VRRP, designed for LANs with multicast and broadcast capabilities (such as Ethernet) 

settles the above problem. The diagram below is taken as an example to explain the 

implementation principal of VRRP. VRRP combines a group of LAN switches (including 

a Master and several Backups) into a virtual router.