Huawei Quidway S6500 Series - Chapter 1 VRRP Configuration

Operation Manual - Reliability
Quidway S6500 Series Ethernet Switches Chapter 1 VRRP Configuration
Huawei Technologies Proprietary
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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.
Ethernet
Switch
Host 1Host 2Host 3
10.100.10.7 10.100.10.8 10.100.10.9
10.100.10.1
Network
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.