Chapter 1 Vrrp Configuration - Huawei Quidway S6500 Series Operation Manual

Operation Manual - Reliability
Quidway S6500 Series Ethernet Switches

Chapter 1 VRRP Configuration

1.1 VRRP Overview
Virtual Router Redundancy Protocol (VRRP) is a fault-tolerant protocol, which is
evoked as a solution to communication interruption caused by a network failure.
In general, a default route (for example, 10.100.10.1 as shown in the following figure)
is configured for every host on a network, so that the packets destined to some other
network segments from these hosts go through the default route to the Layer 3
Switch1, implementing communication between these hosts and the external network.
If Switch1 fails, all the hosts on this segment taking Switch1 as the next-hop on the
default route are cut off from the external network.
10.100.10.7
Host 1
Figure 1-1 LAN Networking
VRRP, which is designed for LANs with multicast and broadcast capabilities (such as
Ethernet) settles this problem. Figure 1-2 illustrates the implementation principal of
VRRP. VRRP combines a group of LAN switches, including a master and several
backups, into a virtual router, or a backup group.
Network
Switch
10.100.10.1
Ethernet
10.100.10.8
Host 2
Huawei Technologies Proprietary
1-1
Chapter 1 VRRP Configuration
10.100.10.9
Host 3