Operation Manual – Reliability
H3C S9500 Series Routing Switches
Chapter 1 VRRP Configuration
1-1
Chapter 1 VRRP Configuration
1.1 Introduction to VRRP
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 1-1
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.
