Chapter 1 Vrrp Configuration; Introduction To Vrrp - H3C S9500 Series Operation Manual

Operation Manual – Reliability
H3C S9500 Series Routing Switches

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.
10.100.10.7
Host 1
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.
Network
Switch
10.100.10.1
Ethernet
10.100.10.8
Host 2
1-1
Chapter 1 VRRP Configuration
10.100.10.9
Host 3