H3C Technologies H3C MSR 50 - Manual (Page 68)

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Figure 22 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 LAN.
2. Load sharing
More than one VRRP group can be created on an interface of a router to allow the router to be the
master of one VRRP group but a backup of another at the same time.
In load sharing mode, multiple routers provide services simultaneously. This mode requires two or
more VRRP groups, each of which comprises a master and one or more backups. The masters of
the VRRP groups are assumed by different routers.
Figure 23 VRRP in load sharing mode
A router can be in multiple VRRP groups and hold a different priority in a different group.
As shown in
Figure 23 , the following VRRP groups are present: