Example for Configuring a VRRP6 Group to Work in Master/Backup Mode

In this example, a VRRP6 group is configured to work in master/backup mode, improving network reliability.

Networking Requirements

Hosts are connected to a network through gateway devices. To improve network reliability, configure a VRRP6 group on the gateway devices.

As shown in Figure 1, the master device forwards traffic in normal circumstances. If the master device fails, the backup device takes over. After the original master device recovers, traffic switches back to it.

Interfaces 1 through 4 in this example represent GE 0/1/0, GE 0/1/8, GE 0/1/16, and GE 0/1/24, respectively.

Figure 1 VRRP6 group working in master/backup mode
Click to enlarge

Configuration Roadmap

The configuration roadmap is as follows:

Assign an IPv6 address to each interface on each device and configure OSPFv3 to ensure network reachability.
Create a VRRP6 group on DeviceA and DeviceB. Configure different priorities for DeviceA and DeviceB to ensure that DeviceA functions as the master device and DeviceB functions as the backup device.

Data Preparation

To complete the configuration, you need the following data:

IPv6 address of each interface on each device (for configuration details, see Configuration Files in this section)
ID of a VRRP6 group: 1; virtual IPv6 address: 2001:db8::100
DeviceA's priority: 120; DeviceB's priority: 100
DeviceA's preemption delay: 20 seconds

Procedure

Configure OSPFv3 on DeviceA, DeviceB, and DeviceC to ensure that they can communicate with each other. For configuration details, see Configuration Files in this section.

Create a VRRP6 group.

# Assign an IPv6 address to GE 0/1/0 on DeviceA. Create VRRP6 group 1 on GE 0/1/0, and set the priority of DeviceA to 120 so that DeviceA functions as the master device.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceA
[*HUAWEI] commit
[~DeviceA] interface gigabitethernet 0/1/0
[~DeviceA-GigabitEthernet0/1/0] undo shutdown
[*DeviceA-GigabitEthernet0/1/0] ipv6 enable
[*DeviceA-GigabitEthernet0/1/0] ipv6 address 2001:db8::1 64
[*DeviceA-GigabitEthernet0/1/0] vrrp6 vrid 1 virtual-ip fe80::1 link-local
[*DeviceA-GigabitEthernet0/1/0] vrrp6 vrid 1 virtual-ip 2001:db8::100
[*DeviceA-GigabitEthernet0/1/0] vrrp6 vrid 1 priority 120
[*DeviceA-GigabitEthernet0/1/0] vrrp6 vrid 1 preempt-mode timer delay 20
[*DeviceA-GigabitEthernet0/1/0] vrrp6 recover-delay 20
[*DeviceA-GigabitEthernet0/1/0] commit
[~DeviceA-GigabitEthernet0/1/0] quit
[~DeviceA] quit

# Assign an IPv6 address to GE 0/1/0 on DeviceB. Create VRRP6 group 1 on GE 0/1/0, and retain the default priority for DeviceB so that DeviceB functions the backup device.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceB
[*HUAWEI] commit
[~DeviceB] interface gigabitethernet 0/1/0
[~DeviceB-GigabitEthernet0/1/0] undo shutdown
[*DeviceB-GigabitEthernet0/1/0] ipv6 enable
[*DeviceB-GigabitEthernet0/1/0] ipv6 address 2001:db8::2 64
[*DeviceB-GigabitEthernet0/1/0] vrrp6 vrid 1 virtual-ip fe80::1 link-local
[*DeviceB-GigabitEthernet0/1/0] vrrp6 vrid 1 virtual-ip 2001:db8::100
[*DeviceB-GigabitEthernet0/1/0] commit
[~DeviceB-GigabitEthernet0/1/0] quit
[~DeviceB] quit

Verify the configuration.

After completing the configurations, ping HostB from HostA. The ping is successful. Run the display vrrp6 verbose command on DeviceA. The command output shows that DeviceA's status is Master.

<DeviceA> display vrrp6 interface gigabitethernet0/1/0 verbose
GigabitEthernet0/1/0 | Virtual Router 1
State           : Master
Virtual IP      : FE80::1
                  2001:DB8::100
Master IP       : 2001:DB8::1
Local IP        : 2001:DB8::1 
PriorityRun     : 120
PriorityConfig  : 120
MasterPriority  : 120
Preempt         : YES   Delay Time : 20s   Remain : --
Hold Multiplier : 4
TimerRun        : 100cs
TimerConfig     : 100cs
Virtual MAC     : 00e0-fc12-7890
Check hop limit : YES
Config Type     : Normal
Create Time       : 2013-07-27 07:37:45
Last Change Time  : 2013-07-27 07:47:38

Run the display vrrp6 verbose command on DeviceB. The command output shows that DeviceB's status is Backup.

<DeviceB> display vrrp6 interface gigabitethernet0/1/0 verbose
GigabitEthernet0/1/0 | Virtual Router 1
State           : Backup
Virtual IP      : FE80::1
                  2001:DB8::100
Master IP       : 2001:DB8::1
Local IP        : 2001:DB8::2
PriorityRun     : 100
PriorityConfig  : 100
MasterPriority  : 120
Preempt         : YES   Delay Time : 0s   Remain : --
Hold Multiplier : 4
TimerRun        : 100cs
TimerConfig     : 100cs
Virtual MAC     : 00e0-fc12-7890
Check hop limit : YES
Config Type     : Normal
Create Time       : 2013-07-27 07:50:28
Last Change Time  : 2013-07-27 07:58:13

Run the shutdown command on DeviceA's GE 0/1/0 to simulate a DeviceA fault.

Run the display vrrp6 verbose command on DeviceA. The command output shows that DeviceA's status is Initialize.

<DeviceA> display vrrp6 interface gigabitethernet0/1/0 verbose
GigabitEthernet0/1/0 | Virtual Router 1
State           : Initialize
Virtual IP      : FE80::1
                  2001:DB8::100
Master IP       : ::
Local IP        : 2001:DB8::1 
PriorityRun     : 120
PriorityConfig  : 120
MasterPriority  : 0
Preempt         : YES   Delay Time : 20s   Remain : --
Hold Multiplier : 4
TimerRun        : 100cs
TimerConfig     : 100cs
Virtual MAC     : 00e0-fc12-7890
Check hop limit : YES
Config Type     : Normal
Create Time       : 2013-07-27 07:37:45
Last Change Time  : 2013-07-27 07:59:38

Run the display vrrp6 verbose command on DeviceB. The command output shows that DeviceB's status is Master.

<DeviceB> display vrrp6 interface gigabitethernet0/1/0 verbose
GigabitEthernet0/1/0 | Virtual Router 1
State           : Master
Virtual IP      : FE80::1
                  2001:DB8::100
Master IP       : 2001:DB8::2
Local IP        : 2001:DB8::2
PriorityRun     : 100
PriorityConfig  : 100
MasterPriority  : 100
Preempt         : YES   Delay Time : 0s   Remain : --
Hold Multiplier : 4
TimerRun        : 100cs
TimerConfig     : 100cs
Virtual MAC     : 00e0-fc12-7890
Check hop limit : YES
Config Type     : Normal
Create Time       : 2013-07-27 07:50:28
Last Change Time  : 2013-07-27 07:59:38

Run the undo shutdown command on DeviceA's GE 0/1/0. After GE 0/1/0 goes up, wait 20s and run the display vrrp6 verbose command on DeviceA. The command output shows that DeviceA's status is Master.

<DeviceA> display vrrp6 interface gigabitethernet0/1/0 verbose
GigabitEthernet0/1/0 | Virtual Router 1
State           : Master
Virtual IP      : FE80::1
                  2001:DB8::100
Master IP       : 2001:DB8::1
Local IP        : 2001:DB8::1
PriorityRun     : 120
PriorityConfig  : 120
MasterPriority  : 120
Preempt         : YES   Delay Time : 20s   Remain : --
Hold Multiplier : 4
TimerRun        : 100cs
TimerConfig     : 100cs
Virtual MAC     : 00e0-fc12-7890
Check hop limit : YES
Config Type     : Normal
Create Time       : 2013-07-27 07:37:45
Last Change Time  : 2013-07-27 08:04:47

Configuration Files

DeviceA configuration file

#
 sysname DeviceA
#
ospfv3 1
 router-id 1.1.1.1
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:DB8::1/64
 vrrp6 vrid 1 virtual-ip fe80::1 link-local
 vrrp6 vrid 1 virtual-ip 2001:DB8::100
 vrrp6 vrid 1 priority 120
 vrrp6 vrid 1 preempt-mode timer delay 20
 vrrp6 recover-delay 20
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:DB8:1::1/64
 ospfv3 1 area 0.0.0.0
#
return

DeviceB configuration file

#
 sysname DeviceB
#
ospfv3 1
 router-id 2.2.2.2
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:DB8::2/64
 vrrp6 vrid 1 virtual-ip fe80::1 link-local
 vrrp6 vrid 1 virtual-ip 2001:DB8::100
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:DB8:2::1/64
 ospfv3 1 area 0.0.0.0
#
return

DeviceC configuration file

#
 sysname DeviceC
#
ospfv3 1
 router-id 3.3.3.3
#
interface GigabitEthernet0/1/16
 undo shutdown
 ipv6 enable
 ipv6 address 2001:DB8:3::2/64
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:DB8:1::2/64
 ospfv3 1 area 0.0.0.0
#
interface GigabitEthernet0/1/24
 undo shutdown
 ipv6 enable
 ipv6 address 2001:DB8:2::2/64
 ospfv3 1 area 0.0.0.0
#
return