H3C Technologies H3C S12500-X Series Switches - Manual (Page 50)

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Figure 14 VRRP in master/backup mode
Assume that Router A is acting as the master to forward packets to external networks, and Router B and
Router C are backups in listening state. When Router A fails, Router B and Router C elect a new master
to forward packets for hosts on the subnet.
Load sharing
A router can join multiple VRRP groups and has different priorities in different VRRP groups, and it can act
as the master in one VRRP group and a backup in another.
In load sharing mode, multiple VRRP groups provide gateway services. This mode requires at least two
VRRP groups, and each group has one master and multiple backups. The master roles in the VRRP groups
are assumed by different routers, as shown in
Figure 15 .
Figure 15 Load sharing of VRRP
A router can be in multiple VRRP groups and have a different priority in each group.
As shown in
Figure 15 , the following VRRP groups are present: