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Preemption, Authentication method – H3C Technologies H3C S12500-X Series Switches User Manual

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# Create VRRP group 1 and set its virtual IPv6 addresses to FE80::10 and 1::10.

[SwitchB-Vlan-interface2] vrrp ipv6 vrid 1 virtual-ip fe80::10 link-local

[SwitchB-Vlan-interface2] vrrp ipv6 vrid 1 virtual-ip 1::10

# Configure Switch B to operate in preemptive mode, and set the preemption delay to 5 seconds.

[SwitchB-Vlan-interface2] vrrp ipv6 vrid 1 preempt-mode delay 5

# Enable Switch B to send RA messages, so Host A can learn the default gateway address.

[SwitchB-Vlan-interface2] undo ipv6 nd ra halt

3.

Verify the configuration:
# Ping Host B from Host A. (Details not shown.)
# Display detailed information about VRRP group 1 on Switch A.

[SwitchA-Vlan-interface2] display vrrp ipv6 verbose

IPv6 Virtual Router Information:

Running Mode : Standard

Total number of virtual routers : 1

Interface Vlan-interface2

VRID : 1 Adver Timer : 100

Admin Status : Up State : Master

Config Pri : 110 Running Pri : 110

Preempt Mode : Yes Delay Time : 5

Auth Type : None

Virtual IP : FE80::10

1::10

Virtual MAC : 0000-5e00-0201

Master IP : FE80::1

# Display detailed information about VRRP group 1 on Switch B.

[SwitchB-Vlan-interface2] display vrrp ipv6 verbose

IPv6 Virtual Router Information:

Running Mode : Standard

Total number of virtual routers : 1

Interface Vlan-interface2

VRID : 1 Adver Timer : 100

Admin Status : Up State : Backup

Config Pri : 100 Running Pri : 100

Preempt Mode : Yes Delay Time : 5

Become Master : 403ms left

Auth Type : None

Virtual IP : FE80::10

1::10

Master IP : FE80::1

The output shows that Switch A is operating as the master in VRRP group 1 to forward packets from

Host A to Host B.
# Disconnect the link between Host A and Switch A, and verify that Host A can still ping Host B.
(Details not shown.)
# Display detailed information about VRRP group 1 on Switch B.

[SwitchB-Vlan-interface2] display vrrp ipv6 verbose

IPv6 Virtual Router Information: