Example: Configuring a single VRRP group

As shown in Figure 54, Switch A and Switch 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 switches.

Switch A operates as the master to forward packets from Host A to Host B. When Switch A fails, Switch B takes over to forward packets for Host A.

	IMPORTANT: By default, interfaces on the device are disabled (in ADM or Administratively Down state). To have an interface operate, you must use the undo shutdown command to enable that interface.

1. Configure Switch A:

   # Configure VLAN 2.

   <SwitchA> system-view
   [SwitchA] vlan 2
   [SwitchA-vlan2] port fortygige 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 VRRP group 1, and set its virtual IPv6 addresses to FE80::10 and 1::10.

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

   # Assign Switch A a higher priority than Switch B in VRRP group 1, so Switch A can become the master.

   [SwitchA-Vlan-interface2] vrrp ipv6 vrid 1 priority 110
   

   # Configure Switch 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.

   [SwitchA-Vlan-interface2] vrrp ipv6 vrid 1 preempt-mode delay 5000
   

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

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

2. Configure Switch B:

   # Configure VLAN 2.

   <SwitchB> system-view
   [SwitchB] vlan 2
   [SwitchB-vlan2] port fortygige 1/0/5
   [SwitchB-vlan2] quit
   [SwitchB] interface vlan-interface 2
   [SwitchB-Vlan-interface2] ipv6 address fe80::2 link-local
   [SwitchB-Vlan-interface2] ipv6 address 1::2 64
   

   # 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 5000 centiseconds.

   [SwitchB-Vlan-interface2] vrrp ipv6 vrid 1 preempt-mode delay 5000
   

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

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

# 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   : 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 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   : 5000
     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:
 Running Mode      : Standard
 Total number of virtual routers : 1
   Interface Vlan-interface2
     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 Switch A fails, Switch B takes over to forward packets from Host A to Host B.

# Recover the link between Host A and Switch A, and 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   : 5000
     Auth Type        : None
     Virtual IP       : FE80::10
                        1::10
     Virtual MAC      : 0000-5e00-0201
     Master IP        : FE80::1

The output shows that after Switch A resumes normal operation, it becomes the master to forward packets from Host A to Host B.