Example for Configuring VRRP6 Association

In this example, a VRRP6 group is associated with a VRRP6-disabled interface or a BFD session. If the interface or the link monitored by BFD goes Down, a master/backup VRRP6 switchover is performed.

Networking Requirements

Hosts are connected to a network through gateway devices. To improve network reliability, configure a VRRP6 group on the gateway devices. To further improve network reliability and implement a rapid master/backup VRRP6 switchover, configure VRRP6 association.

On the network shown in Figure 1, the master router forwards traffic in normal circumstances. If the BFD-monitored active link on the master router or a VRRP6-disabled interface fails, associate the VRRP6 group with the BFD session or VRRP6-disabled interface to implement a rapid master/backup VRRP6 switchover. After the master router recovers, traffic is switched back.

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 association

Configuration Roadmap

The configuration roadmap is as follows:

  1. Assign an IPv6 address to each interface on each device and configure OSPFv3 to ensure network reachability.

  2. Create a VRRP6 group on gateway routers and configure different priorities for the routers to determine the master or backup role.

  3. Configure a BFD session on DeviceA and DeviceB to monitor the link DeviceA -> DeviceD -> DeviceB.

  4. Associate the VRRP6 group with the BFD session on DeviceB (backup). If the BFD session goes Down, the VRRP6 group immediately performs a master/backup VRRP6 switchover.

  5. Associate the VRRP6 group with a VRRP6-disabled interface on DeviceA. If the VRRP6-disabled interface goes Down, the VRRP6 group immediately performs a master/backup VRRP6 switchover.

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

  • Local and remote discriminators of BFD sessions

  • Priority by which DeviceB increases if the BFD session goes Down: 40
  • Priority by which DeviceA decreases if the VRRP6-disabled interface goes Down: 40

  • DeviceA's preemption delay: 20 seconds

Procedure

  1. 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.
  2. 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] quit
[*DeviceA] commit

    # 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] quit
[*DeviceB] commit

  3. Configure basic BFD functions.

    # Configure a BFD session on DeviceA.

    [~DeviceA] bfd
[~DeviceA-bfd] quit
[~DeviceA] bfd atob bind peer-ipv6 2001:db8::2 interface gigabitethernet 0/1/0
[*DeviceA-bfd-session-atob] discriminator local 1
[*DeviceA-bfd-session-atob] discriminator remote 2
[*DeviceA-bfd-session-atob] min-rx-interval 50
[*DeviceA-bfd-session-atob] min-tx-interval 50 
[*DeviceA-bfd-session-atob] commit
[~DeviceA-bfd-session-atob] quit

    # Configure a BFD session on DeviceB.

    [~DeviceB] bfd
[~DeviceB-bfd] quit
[~DeviceB] bfd btoa bind peer-ipv6 2001:db8::1 interface gigabitethernet 0/1/0
[*DeviceB-bfd-session-btoa] discriminator local 2
[*DeviceB-bfd-session-btoa] discriminator remote 1
[*DeviceB-bfd-session-btoa] min-rx-interval 50
[*DeviceB-bfd-session-btoa] min-tx-interval 50
[*DeviceB-bfd-session-btoa] commit
[~DeviceB-bfd-session-btoa] quit

    After completing the configurations, run the display bfd session all command on DeviceA or DeviceB. The command output shows that the BFD session is Up. The following example uses the command output on DeviceA.

    [~DeviceA] display bfd session all
S: Static session
D: Dynamic session
IP: IP session
IF: Single-hop session
PEER: Multi-hop session
AUTO: Automatically negotiated session
(w): State in WTR 
(*): State is invalid
Total UP/DOWN Session Number : 1/0
--------------------------------------------------------------------------------
Local Remote PeerIpAddr      State     Type        InterfaceName
--------------------------------------------------------------------------------
1     2      2001:DB8::2     Up        S_IP_IF     GigabitEthernet0/1/0
--------------------------------------------------------------------------------

  4. Configure VRRP6 association.

    # Associate the VRRP6 group with the VRRP6-disabled interface on DeviceA.

    [~DeviceA] interface gigabitethernet 0/1/0
[*DeviceA-GigabitEthernet0/1/0] vrrp6 vrid 1 track interface gigabitethernet 0/1/8 reduced 40
[*DeviceA-GigabitEthernet0/1/0] quit
[*DeviceA] commit

    # Associate the VRRP6 group with the BFD session on DeviceB.

    [~DeviceB] interface gigabitethernet 0/1/0
[*DeviceB-GigabitEthernet0/1/0] vrrp6 vrid 1 track bfd-session 2 increased 40
[*DeviceB-GigabitEthernet0/1/0] quit
[*DeviceB] commit

  5. 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 and GE 0/1/8 has been associated.

    [*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
Track IF          : GigabitEthernet0/1/8             Priority Reduced : 40
IF State          : UP
Create Time       : 2013-07-27 17:33:00
Last Change Time  : 2013-07-27 17:33:04

    Run the display vrrp6 verbose command on DeviceB. The command output shows that DeviceB's status is Backup and the BFD session has been associated.

    [*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
Track BFD         : btoa                 Priority Increased : 40
BFD-Session State : UP
Create Time       : 2013-07-27 17:33:00
Last Change Time  : 2013-07-27 17:33:04

    Run the shutdown command on DeviceA's GE 0/1/8 to simulate a DeviceA fault.

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

    [*DeviceA] 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::2
Local IP        : 2001:DB8::1 
PriorityRun     : 80
PriorityConfig  : 120
MasterPriority  : 100
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
Track IF          : GigabitEthernet0/1/8             Priority Reduced : 40
IF State          : DOWN
Create Time       : 2013-07-27 17:33:00
Last Change Time  : 2013-07-27 17:35:14

    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
Track BFD         : btoa                 Priority Increased : 40
BFD-Session State : UP
Create Time       : 2013-07-27 17:33:00
Last Change Time  : 2013-07-27 17:33:04

    Run the undo shutdown command on DeviceA's GE 0/1/8. After GE 0/1/8 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
Track IF          : GigabitEthernet0/1/8             Priority Reduced : 40
IF State          : UP
Create Time       : 2013-07-27 17:33:00
Last Change Time  : 2013-07-27 17:40:04

Configuration Files

  • DeviceA configuration file

    #
 sysname DeviceA
#
 bfd
#
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
 vrrp6 vrid 1 track interface gigabitethernet 0/1/8 reduced 40
 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
#
bfd atob bind peer-ipv6 2001:DB8::2 interface gigabitethernet 0/1/0
 discriminator local 1
 discriminator remote 2
 min-tx-interval 50
 min-rx-interval 50
 commit
#
return

  • DeviceB configuration file

    #
 sysname DeviceB
#
bfd
#
 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
 vrrp6 vrid 1 track bfd-session session-name btoa increased 40
 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
#
bfd btoa bind peer-ipv6 2001:DB8::1 interface gigabitethernet 0/1/0
 discriminator local 2
 discriminator remote 1
 min-tx-interval 50
 min-rx-interval 50
 commit
#
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
 commit
#
return
Parent Topic: Configuration Examples for VRRP6
Copyright © Huawei Technologies Co., Ltd.
Copyright © Huawei Technologies Co., Ltd.
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