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Figure 31 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 32.
Figure 32
Load sharing of VRRP
A router can be in multiple VRRP groups and have a different priority in each group.
As shown in Figure 32, the followin
g 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.
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