Example for Associating a VRRP Group with a VRRP-disabled Interface

In this example, a VRRP group is associated with a VRRP-disabled interface. If the interface fails, a master/backup switchover is performed.

Networking Requirements

The master device cannot detect changes in the status of interfaces that are not in a VRRP group. If a VRRP-disabled interface connected to a network fails, the master device cannot detect the fault and still forwards user packets through the failed interface, which results in service interruptions. To prevent this issue, associate the VRRP group with the VRRP-disabled interface. If the interface goes Down, the VRRP group detects the fault, reduces the priority of the master device, and sends VRRP Advertisement packets to elect a new master device.

On the network shown in Figure 1, Host A is connected to Host B by using a default gateway. A VRRP group is configured on Device A and Device B. Device A is the master device, and Device B is the backup device. Host A sends traffic to Host B along the path Host A -> Device A -> Device C -> Host B. If the link between Device A and Device C fails, traffic from Host A to Host B is discarded. To prevent the issue, associate the VRRP group with the interfaces connecting Device A to Device C and connecting Device B to Device C.

Interfaces 1 through 3 in this example represent GE 0/1/0, GE 0/1/8, and GE 0/1/16, respectively.

Figure 1 Associating a VRRP group with interfaces

Precautions

The IP address of GE 0/1/0 on Device A and IP address of GE 0/1/0 on Device B must be on the same network segment.

Configuration Roadmap

The configuration roadmap is as follows:

Configure VRRP group 1 on GE 0/1/0 of Device A, and set a high VRRP priority for Device A so that Device A functions as the master device.
Configure VRRP group 1 on GE 0/1/0 of Device B, and retain the default VRRP priority for Device B so that Device B functions as the backup device.
Associate VRRP group 1 on Device A with GE 0/1/8 connected to Device C.

Data Preparation

To complete the configuration, you need the following data:

Virtual IP address and ID of a VRRP group
Priority of each device in a VRRP group

Procedure

Assign an IP address to each interface on Device A, Device B, and Device C. Configure OSPF to ensure that these routers can communicate with each other.

# Configure Device A.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceA
[*HUAWEI] commit
[~DeviceA] interface gigabitethernet 0/1/0
[~DeviceA-GigabitEthernet0/1/0] undo shutdown
[*DeviceA-GigabitEthernet0/1/0] ip address 10.1.1.1 24
[*DeviceA-GigabitEthernet0/1/0] quit
[*DeviceA] interface gigabitethernet 0/1/8
[*DeviceA-GigabitEthernet0/1/8] undo shutdown
[*DeviceA-GigabitEthernet0/1/8] ip address 192.168.1.1 24
[*DeviceA-GigabitEthernet0/1/8] quit
[*DeviceA] ospf 1
[*DeviceA-ospf-1] area 0
[*DeviceA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[*DeviceA-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
[*DeviceA-ospf-1-area-0.0.0.0] commit
[~DeviceA-ospf-1-area-0.0.0.0] quit
[~DeviceA-ospf-1] quit

# Configure Device B.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceB
[*HUAWEI] commit
[~DeviceB] interface gigabitethernet 0/1/0
[~DeviceB-GigabitEthernet0/1/0] undo shutdown
[*DeviceB-GigabitEthernet0/1/0] ip address 10.1.1.2 24
[*DeviceB-GigabitEthernet0/1/0] quit
[*DeviceB] interface gigabitethernet 0/1/8
[*DeviceB-GigabitEthernet0/1/8] undo shutdown
[*DeviceB-GigabitEthernet0/1/8] ip address 192.168.2.1 24
[*DeviceB-GigabitEthernet0/1/8] quit
[*DeviceB] ospf 1
[*DeviceB-ospf-1] area 0
[*DeviceB-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255
[*DeviceB-ospf-1-area-0.0.0.0] network 192.168.2.0 0.0.0.255
[*DeviceB-ospf-1-area-0.0.0.0] commit
[~DeviceB-ospf-1-area-0.0.0.0] quit
[~DeviceB-ospf-1] quit

# Configure Device C.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceC
[*HUAWEI] commit
[~DeviceC] interface gigabitethernet 0/1/0
[~DeviceC-GigabitEthernet0/1/0] undo shutdown
[*DeviceC-GigabitEthernet0/1/0] ip address 192.168.1.2 24
[*DeviceC-GigabitEthernet0/1/0] quit
[*DeviceC] interface gigabitethernet 0/1/8
[*DeviceC-GigabitEthernet0/1/8] undo shutdown
[*DeviceC-GigabitEthernet0/1/8] ip address 192.168.2.2 24
[*DeviceC-GigabitEthernet0/1/8] quit
[*DeviceC] interface gigabitethernet 0/1/16
[*DeviceC-GigabitEthernet0/1/16] undo shutdown
[*DeviceC-GigabitEthernet0/1/16] ip address 172.16.1.1 24
[*DeviceC-GigabitEthernet0/1/16] quit
[*DeviceC] ospf 1
[*DeviceC-ospf-1] area 0
[*DeviceC-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255
[*DeviceC-ospf-1-area-0.0.0.0] network 192.168.2.0 0.0.0.255
[*DeviceC-ospf-1-area-0.0.0.0] network 172.16.1.0 0.0.0.255
[*DeviceC-ospf-1-area-0.0.0.0] commit
[~DeviceC-ospf-1-area-0.0.0.0] quit
[~DeviceC-ospf-1] quit

Configure a VRRP group.

# Configure VRRP group 1 on Device A, and set the VRRP priority of Device A to 120 so that Device A functions as the master device.

[~DeviceA] interface gigabitethernet 0/1/0
[~DeviceA-GigabitEthernet0/1/0] vrrp vrid 1 virtual-ip 10.1.1.111
[*DeviceA-GigabitEthernet0/1/0] vrrp vrid 1 priority 120
[*DeviceA-GigabitEthernet0/1/0] commit
[~DeviceA-GigabitEthernet0/1/0] quit

# Configure VRRP group 1 on Device B, and retain the default VRRP priority for Device B so that Device B functions as the backup device.

[~DeviceB] interface gigabitethernet 0/1/0
[~DeviceB-GigabitEthernet0/1/0] vrrp vrid 1 virtual-ip 10.1.1.111
[*DeviceB-GigabitEthernet0/1/0] commit
[~DeviceB-GigabitEthernet0/1/0] quit

Associate the VRRP group with an interface.

# Configure Device A.

[~DeviceA] interface gigabitethernet 0/1/0
[~DeviceA-GigabitEthernet0/1/0] vrrp vrid 1 track interface gigabitethernet 0/1/8 reduced 30
[*DeviceA-GigabitEthernet0/1/0] commit
[~DeviceA-GigabitEthernet0/1/0] quit

Verify the configuration.

After completing the configurations, run the display vrrp command on Device A and Device B to view information about the interface tracked by the VRRP group and its status. The following example uses the command output on Device A.

[~DeviceA] display vrrp
GigabitEthernet0/1/0 | Virtual Router 1
State             : Master
Virtual IP        : 10.1.1.111
Master IP         : 10.1.1.1
Local IP          : 10.1.1.1
PriorityRun       : 120
PriorityConfig    : 120
MasterPriority    : 120
Preempt           : YES                     Delay Time : 0s
Hold Multiplier   : 4
TimerRun          : 1s
TimerConfig       : 1s
Auth Type         : NONE
Virtual MAC       : 00e0-fc12-7890
Check TTL         : YES
Config Type       : normal-vrrp
Backup-forward    : disabled
Track IF          : GigabitEthernet0/1/8            Priority Reduced :30
IF State          : UP
Create Time          : 2011-12-29 05:41:23
Last Change Time     : 2011-12-29 05:41:33

Run the shutdown command on GE 0/1/8 of Device A to simulate a link fault.

[~DeviceA] interface gigabitethernet 0/1/8
[~DeviceA-GigabitEthernet0/1/8] shutdown
[*DeviceA-GigabitEthernet0/1/8] commit
[~DeviceA-GigabitEthernet0/1/8] quit

Run the display vrrp command on Device A. The command output shows that the VRRP status of Device A has become Backup.

[~DeviceA] display vrrp
GigabitEthernet0/1/0 | Virtual Router 1
State             : Backup
Virtual IP        : 10.1.1.111
Master IP         : 10.1.1.2
Local IP          : 10.1.1.1
PriorityRun       : 90
PriorityConfig    : 120
MasterPriority    : 100
Preempt           : YES                Delay Time : 0s
Hold Multiplier   : 4
TimerRun          : 1s
TimerConfig       : 1s
Auth Type         : NONE
Virtual MAC       : 00e0-fc12-7890
Check TTL         : YES
Config Type       : normal-vrrp
Backup-forward    : disabled
Track IF          : GigabitEthernet0/1/8            Priority Reduced :30
IF State          : DOWN
Create Time          : 2011-12-29 05:41:23
Last Change Time     : 2011-12-29 05:41:33

Run the display vrrp command on Device B. The command output shows that the VRRP status of Device B has become Master.

[~DeviceB] display vrrp
GigabitEthernet0/1/0 | Virtual Router 1
State             : Master
Virtual IP        : 10.1.1.111
Master IP         : 10.1.1.2
Local IP          : 10.1.1.2
PriorityRun       : 100
PriorityConfig    : 100
MasterPriority    : 100
Preempt           : YES                     Delay Time : 0s
Hold Multiplier   : 4
TimerRun          : 1s
TimerConfig       : 1s
Auth Type         : NONE
Virtual MAC       : 00e0-fc12-7890
Check TTL         : YES
Config Type       : normal-vrrp
Backup-forward    : disabled
Create Time          : 2011-12-29 05:41:23
Last Change Time     : 2011-12-29 05:41:33

Configuration Files

Device A configuration file

# 
sysname DeviceA
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 10.1.1.1 255.255.255.0
 vrrp vrid 1 virtual-ip 10.1.1.111
 vrrp vrid 1 priority 120
 vrrp vrid 1 track interface gigabitethernet 0/1/8 reduced 30
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 192.168.1.1 255.255.255.0
#
ospf 1
 area 0.0.0.0
  network 10.1.1.0 0.0.0.255
  network 192.168.1.0 0.0.0.255
#
return

Device B configuration file

# 
sysname DeviceB
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 10.1.1.2 255.255.255.0
 vrrp vrid 1 virtual-ip 10.1.1.111
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 192.168.2.1 255.255.255.0
#
ospf 1
 area 0.0.0.0
  network 10.1.1.0 0.0.0.255
  network 192.168.2.0 0.0.0.255
#
return

Device C configuration file

# 
sysname DeviceC
#
interface GigabitEthernet0/1/0
 undo shutdown
 ip address 192.168.1.2 255.255.255.0
#
interface GigabitEthernet0/1/8
 undo shutdown
 ip address 192.168.2.2 255.255.255.0
#
interface GigabitEthernet0/1/16
 undo shutdown
 ip address 172.16.1.1 255.255.255.0
#
ospf 1
 area 0.0.0.0
  network 192.168.1.0 0.0.0.255
  network 192.168.2.0 0.0.0.255
  network 172.16.1.0 0.0.0.255
#
return