H3C Technologies H3C SR8800 - Manual (Page 56)

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Figure 14 VRRP in master/backup mode
Assume that Router A is the master and therefore can forward packets to external networks, whereas
Router B and Router C are backups and are thus in the state of listening. If Router A fails, Router B and
Router C elect for a new master to forward packets to hosts on the LAN.
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, as shown in
Figure 15 .
Figure 15 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 15 , the following VRRP groups are present: