Single VRRP group configuration example
Network requirements
As shown in Figure 26, Router A and Router B form a VRRP group. They use the virtual IP addresses 1::10/64 and FE80::10 to provide gateway service for the subnet where Host A resides.
Host A learns 1::10/64 as its default gateway from RA messages sent by the routers.
Router A operates as the master to forward packets from Host A to Host B. When Router A fails, Router B takes over to forward packets for Host A.
Figure 26: Network diagram
Configuration procedure
Configure Router A:
# Specify an IPv6 address for Router A.
<RouterA> system-view [RouterA] interface gigabitethernet 1/0/1 [RouterA-GigabitEthernet1/0/1] ipv6 address fe80::1 link-local [RouterA-GigabitEthernet1/0/1] ipv6 address 1::1 64
# Create VRRP group 1, and set its virtual IPv6 addresses to FE80::10 and 1::10.
[RouterA-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 virtual-ip fe80::10 link-local [RouterA-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 virtual-ip 1::10
# Assign Router A a higher priority than Router B in VRRP group 1, so Router A can become the master.
[RouterA-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 priority 110
# Configure Router A to operate in preemptive mode, so it can become the master whenever it operates correctly. Set the preemption delay to 5000 centiseconds to avoid frequent status switchover.
[RouterA-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 preempt-mode delay 5000
# Enable Router A to send RA messages, so Host A can learn the default gateway address.
[RouterA-GigabitEthernet1/0/1] undo ipv6 nd ra halt
Configure Router B:
# Specify an IPv6 address for Router B.
<RouterB> system-view [RouterB] interface gigabitethernet 1/0/1 [RouterB-GigabitEthernet1/0/1] ipv6 address fe80::2 link-local [RouterB-GigabitEthernet1/0/1] ipv6 address 1::2 64
# Create VRRP group 1, and set its virtual IPv6 addresses to FE80::10 and 1::10.
[RouterB-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 virtual-ip fe80::10 link-local [RouterB-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 virtual-ip 1::10
# Configure Router B to operate in preemptive mode, and set the preemption delay to 5000 centiseconds.
[RouterB-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 preempt-mode delay 5000
# Enable Router B to send RA messages, so Host A can learn the default gateway address.
[RouterB-GigabitEthernet1/0/1] undo ipv6 nd ra halt
Verifying the configuration
# Ping Host B from Host A. (Details not shown.)
# Display detailed information about VRRP group 1 on Router A.
[RouterA-GigabitEthernet1/0/1] display vrrp ipv6 verbose IPv6 Virtual Router Information: Running Mode : Standard Total number of virtual routers : 1 Interface GigabitEthernet1/0/1 VRID : 1 Adver Timer : 100 Admin Status : Up State : Master Config Pri : 110 Running Pri : 110 Preempt Mode : Yes Delay Time : 5000 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 Router B.
[RouterB-GigabitEthernet1/0/1] display vrrp ipv6 verbose IPv6 Virtual Router Information: Running Mode : Standard Total number of virtual routers : 1 Interface GigabitEthernet1/0/1 VRID : 1 Adver Timer : 100 Admin Status : Up State : Backup Config Pri : 100 Running Pri : 100 Preempt Mode : Yes Delay Time : 5000 Become Master : 411ms left Auth Type : None Virtual IP : FE80::10 1::10 Master IP : FE80::1
The output shows that Router 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 Router A, and verify that Host A can still ping Host B. (Details not shown.)
# Display detailed information about VRRP group 1 on Router B.
[RouterB-GigabitEthernet1/0/1] display vrrp ipv6 verbose IPv6 Virtual Router Information: Running Mode : Standard Total number of virtual routers : 1 Interface GigabitEthernet1/0/1 VRID : 1 Adver Timer : 100 Admin Status : Up State : Master Config Pri : 100 Running Pri : 100 Preempt Mode : Yes Delay Time : 5000 Auth Type : None Virtual IP : FE80::10 1::10 Virtual MAC : 0000-5e00-0201 Master IP : FE80::2
The output shows that when Router A fails, Router B takes over to forward packets from Host A to Host B.
# Recover the link between Host A and Router A, and display detailed information about VRRP group 1 on Router A.
[RouterA-GigabitEthernet1/0/1] display vrrp ipv6 verbose IPv6 Virtual Router Information: Running Mode : Standard Total number of virtual routers : 1 Interface GigabitEthernet1/0/1 VRID : 1 Adver Timer : 100 Admin Status : Up State : Master Config Pri : 110 Running Pri : 110 Preempt Mode : Yes Delay Time : 5000 Auth Type : None Virtual IP : FE80::10 1::10 Virtual MAC : 0000-5e00-0201 Master IP : FE80::1
The output shows that after Router A resumes normal operation, it becomes the master to forward packets from Host A to Host B.