Vrrp Load Balancing Mode; Overview - H3C S9500E Series Configuration Manual

Load sharing
You can create more than one VRRP group on an interface of a router, and allow the router to be
the master of one VRRP group and a backup of another at the same time.
In load sharing mode, multiple routers provide services at the same time. This mode requires two
or more VRRP groups, each of which includes a master and one or more backups. The masters of
the VRRP groups are assumed by different routers, as shown in Figure 27.
Figure 27 VRRP in load sharing mode
Host A
Host B
Host C
A router can be in multiple VRRP groups and hold a different priority in different group.
In Figure 27, three VRRP groups are present:
•
VRRP group 1: Router A is the master; Router B and Router C are the backups.
•
VRRP group 2: Router B is the master; Router A and Router C are the backups.
•
VRRP group 3: Router C is the master; Router A and Router B are the backups.
For load sharing among Router A, Router B, and Router C, hosts on the LAN need to be
configured to use VRRP group 1, 2, and 3 as the default gateways respectively. When
configuring VRRP priorities, make sure that each router holds such a priority in each VRRP group
that it will take the expected role in the group.

VRRP load balancing mode

Overview

When VRRP works in the standard protocol mode, only the master can forward packets and the
backups are in the state of listening. Although you can create multiple VRRP groups to implement
VRRP group 1 VRRP group 2
Master Backup
Backup Master
Backup Backup
VRRP group 3
Router A
Backup
Router B
Backup
Network
Router C
Master
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