Vrrp Overview; Chapter 1 Vrrp Configuration - Huawei Quidway S3900 Series Operation Manual

Operation Manual – VRRP
Quidway S3900 Series Ethernet Switches-Release 1510

Chapter 1 VRRP Configuration

Note:
The S3900-EI series switches support the VRRP feature, but not the S3900-SI series.

1.1 VRRP Overview

Virtual router redundancy protocol (VRRP) is a fault-tolerant protocol.
As shown in Figure 1-1, in general,
A default route (for example, the next hop address of the default route is
10.100.10.1, as shown in the following figure) is configured for every host on a
network.
The packets destined to the external network segments and sourced from these
hosts go through the default routes to the Layer 3 Switch, implementing
communication between these hosts and the external network.
If Switch fails, all the hosts on this segment taking Switch as the next-hop through
the default routes are cut off from the external network.
10.100.10.7
Host 1
Figure 1-1 LAN Networking
VRRP, designed for LANs with multicast and broadcast capabilities (such as Ethernet),
settles the problem caused by switch failures.
VRRP combines a group of LAN switches, including a master switch and several
backup switches, 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