Single VRRP group configuration example

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.

1. 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
   

2. 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
   

# 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.