3Com Switch 4800G 24-Port Configuration Manual page 1097

If Switch A operates normally, packets sent from Host A to Host B are
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forwarded by Switch A; if Switch A fails, packets sent from Host A to Host B are
forwarded by Switch B.
Network diagram
Figure 327 Network diagram for single VRRP standby group configuration
Gateway:
FE80::10
Host A
Configuration procedure
1 Configure Switch A
# Configure VLAN 2.
<SwitchA> system-view
[SwitchA] ipv6
[SwitchA] vlan 2
[SwitchA-vlan2] port GigabitEthernet 1/0/5
[SwitchA-vlan2] quit
[SwitchA] interface vlan-interface 2
[SwitchA-Vlan-interface2] ipv6 address fe80::1 link-local
[SwitchA-Vlan-interface2] ipv6 address 1::1 64
# Create a standby group 1 and set its virtual IP address to FE80::10.
[SwitchA-Vlan-interface2] vrrp ipv6 vrid 1 virtual-ip fe80::10 link-
local
# Set the priority of Switch A in standby group 1 to 110.
[SwitchA-Vlan-interface2] vrrp ipv6 vrid 1 priority 110
# Set Switch A to work in preemption mode.
[SwitchA-Vlan-interface2] vrrp ipv6 vrid 1 preempt-mode
# Enable Switch A to send RA messages.
[SwitchA-Vlan-interface2] undo ipv6 nd ra halt
2 Configure Switch B
IPv6-Based VRRP Configuration Examples
Virtual IPv6 address:
FE80::10
Vlan-int2
FE80::1
Switch A
Internet
Vlan -int2
FE80 ::2
Switch B
1097
Host B