Huawei NetEngine80E Configuration Manual - Reliability page 126

HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
(ICMP). This method is only available if every host runs a dynamic routing protocol and there
is no problem in proper management, security, or operating systems' support for protocols.
VRRP prevents communication failures in a better way than the preceding two solutions. VRRP
is only configured on routers to implement gateway backup, without any networking changes
or burden on hosts.
VRRP Definition
VRRP is a fault-tolerant protocol defined in RFC 3768. VRRP allows logical devices to work
separately from physical devices, and implements route selection among multiple egress
gateways.
Figure 4-2
and the other is the backup. The two routers form a virtual router and this virtual router obtains
a virtual IP address and a virtual MAC address. Hosts monitor the presence of the virtual
router but not the presence of the master and backup routers. Hosts communicate with devices
on other network segments through the virtual router.
A virtual router consists of a master router and one or more backup routers. Only the master
router forwards packets. If the master router fails, a backup router is elected as the master
router and takes over traffic.
Figure 4-2 Schematic diagram for a VRRP backup group
PCA
Gateway:10.1.1.10
IP Address:10.1.1.3/24
PCA
Gateway:10.1.1.10
IP Address:10.1.1.3/24
On a multicast or broadcast LAN such as an Ethernet network, a logical VRRP gateway ensures
reliability for key links. VRRP is highly reliable and prevents service interruption if a physical
Issue 02 (2014-09-30)
shows a VRRP-enabled network. VRRP is enabled on two routers. One is the master
10.1.1.2/24
SwitchA
10.1.1.1/24
SwitchA
Virture Router
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Virtual IP Address
Master
10.1.1.10
Backup
10.1.1.10
4 VRRP Configuration
Network
Network
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