R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

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Figure 37 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 38 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 38, the following VRRP groups are present:
Host A
Host B
Host C
Router A
Master
Router B
Backup
Router C
Backup
Virtual IP address:
10.1.1.1/24
10.1.1.2/24
10.1.1.3/24
10.1.1.4/24
Network
Host A
Host B
Host C
Router A
Backup
Router B
Backup
Router C
Master
VRRP group 2 VRRP group 3VRRP group 1
Master
Backup
Backup Backup
Master
Backup
Network