H3C S5500-EI series Operation Manual page 1320

Operation Manual – VRRP
H3C S5500-EI Series Ethernet Switches
only one standby group, in which each switch holds different priorities and the one with
the highest priority becomes the master, as shown in
Figure 1-5 VRRP in master/backup mode
At the beginning, Switch A is the master and therefore can forward packets to external
networks, while Switch B and Switch C are backups and are thus in the state of
listening. If Switch A fails, Switch B and Switch C will elect for the new master. The new
master takes over the forwarding task to provide services to hosts on the LAN.
II. Load balancing
You can create more than one standby group on an interface of a switch, allowing the
switch to be the master of one standby group but a backup of another at the same time.
In load balancing mode, multiple switches provide services at the same time. This
mode requires two or more standby groups, each of which includes a master and one
or more backups. The masters of the standby groups can be assumed by different
switches, as shown in Figure 1-6.
1-8
Chapter 1 VRRP Configuration
Figure 1-5.