VRRP load balancing configuration example
Network requirements
As shown in Figure 28, Router A, Router B, and Router C form a load balanced VRRP group and use the virtual IPv6 addresses FE80::10 and 1::10 to provide gateway service for the subnet 1::/64.
Hosts on subnet 1::/64 learn 1::10 as their default gateway from RA messages sent by the routers.
Configure VFs on Router A, Router B, or Router C to monitor their respective GigabitEthernet 1/0/2. When the interface on any of them fails, the weights of the VFs on the problematic router decrease so another AVF can take over.
Figure 28: Network diagram
Configuration procedure
Configure Router A:
# Configure VRRP to operate in load balancing mode.
<RouterA> system-view [RouterA] vrrp ipv6 mode load-balance
# Create VRRP group 1, and set its virtual IPv6 addresses to FE80::10 and 1::10.
[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 [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 the highest priority in VRRP group 1, so Router A can become the master.
[RouterA-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 priority 120
# 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 hosts on subnet 1::/64 can learn the default gateway address.
[RouterA-GigabitEthernet1/0/1] undo ipv6 nd ra halt [RouterA-GigabitEthernet1/0/1] quit
# Create track entry 1 to monitor the upstream link status of GigabitEthernet 1/0/2. When the upstream link fails, the track entry transits to Negative.
[RouterA] track 1 interface gigabitethernet 1/0/2
# Configure the VFs in VRRP group 1 to monitor track entry 1, and decrease their weights by 250 when the track entry transits to Negative.
[RouterA] interface gigabitethernet 1/0/1 [RouterA-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 track 1 weight reduced 250
Configure Router B:
# Configure VRRP to operate in load balancing mode.
<RouterB> system-view [RouterB] vrrp ipv6 mode load-balance
# Create VRRP group 1, and set its virtual IPv6 addresses to FE80::10 and 1::10.
[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 [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
# Assign Router B a higher priority than Router C in VRRP group 1, so Router B can become the master when Router A fails.
[RouterB-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 priority 110
# 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 hosts on subnet 1::/64 can learn the default gateway address.
[RouterB-GigabitEthernet1/0/1] undo ipv6 nd ra halt [RouterB-GigabitEthernet1/0/1] quit
# Create track entry 1 to monitor the upstream link status of GigabitEthernet 1/0/2. When the upstream link fails, the track entry transits to Negative.
[RouterB] track 1 interface gigabitethernet 1/0/2
# Configure the VFs in VRRP group 1 to monitor track entry 1, and decrease their weights by 250 when the track entry transits to Negative.
[RouterB] interface gigabitethernet 1/0/1 [RouterB-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 track 1 weight reduced 250
Configure Router C:
# Configure VRRP to operate in load balancing mode.
<RouterC> system-view [RouterC] vrrp ipv6 mode load-balance
# Create VRRP group 1 and set its virtual IPv6 addresses to FE80::10 and 1::10.
[RouterC] interface gigabitethernet 1/0/1 [RouterC-GigabitEthernet1/0/1] ipv6 address fe80::3 link-local [RouterC-GigabitEthernet1/0/1] ipv6 address 1::3 64 [RouterC-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 virtual-ip fe80::10 link-local [RouterC-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 virtual-ip 1::10
# Configure Router C to operate in preemptive mode and set the preemption delay to 5000 centiseconds.
[RouterC-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 preempt-mode delay 5000
# Enable Router C to send RA messages, so hosts on subnet 1::/64 can learn the default gateway address.
[RouterC-GigabitEthernet1/0/1] undo ipv6 nd ra halt [RouterC-GigabitEthernet1/0/1] quit
# Create track entry 1 to monitor the upstream link status of GigabitEthernet 1/0/2. When the upstream link fails, the track entry transits to Negative.
[RouterC] track 1 interface gigabitethernet 1/0/2
# Configure the VFs in VRRP group 1 to monitor track entry 1, and decrease their weights by 250 when the track entry transits to Negative.
[RouterC] interface gigabitethernet 1/0/1 [RouterC-GigabitEthernet1/0/1] vrrp ipv6 vrid 1 track 1 weight reduced 250
Verifying the configuration
# Verify that Host A can ping the external network. (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 : Load Balance
Total number of virtual routers : 1
Interface GigabitEthernet1/0/1
VRID : 1 Adver Timer : 100
Admin Status : Up State : Master
Config Pri : 120 Running Pri : 120
Preempt Mode : Yes Delay Time : 5000
Auth Type : None
Virtual IP : FE80::10
1::10
Member IP List : FE80::1 (Local, Master)
FE80::2 (Backup)
FE80::3 (Backup)
Forwarder Information: 3 Forwarders 1 Active
Config Weight : 255
Running Weight : 255
Forwarder 01
State : Active
Virtual MAC : 000f-e2ff-4011 (Owner)
Owner ID : 0000-5e01-1101
Priority : 255
Active : local
Forwarder 02
State : Listening
Virtual MAC : 000f-e2ff-4012 (Learnt)
Owner ID : 0000-5e01-1103
Priority : 127
Active : FE80::2
Forwarder 03
State : Listening
Virtual MAC : 000f-e2ff-4013 (Learnt)
Owner ID : 0000-5e01-1105
Priority : 127
Active : FE80::3
Forwarder Weight Track Information:
Track Object : 1 State : Positive Weight Reduced : 250
# Display detailed information about VRRP group 1 on Router B.
[RouterB-GigabitEthernet1/0/1] display vrrp ipv6 verbose
IPv6 Virtual Router Information:
Running Mode : Load Balance
Total number of virtual routers : 1
Interface GigabitEthernet1/0/1
VRID : 1 Adver Timer : 100
Admin Status : Up State : Backup
Config Pri : 110 Running Pri : 110
Preempt Mode : Yes Delay Time : 5000
Become Master : 400ms left
Auth Type : None
Virtual IP : FE80::10
1::10
Member IP List : FE80::2 (Local, Backup)
FE80::1 (Master)
FE80::3 (Backup)
Forwarder Information: 3 Forwarders 1 Active
Config Weight : 255
Running Weight : 255
Forwarder 01
State : Listening
Virtual MAC : 000f-e2ff-4011 (Learnt)
Owner ID : 0000-5e01-1101
Priority : 127
Active : FE80::1
Forwarder 02
State : Active
Virtual MAC : 000f-e2ff-4012 (Owner)
Owner ID : 0000-5e01-1103
Priority : 255
Active : local
Forwarder 03
State : Listening
Virtual MAC : 000f-e2ff-4013 (Learnt)
Owner ID : 0000-5e01-1105
Priority : 127
Active : FE80::3
Forwarder Weight Track Information:
Track Object : 1 State : Positive Weight Reduced : 250
# Display detailed information about VRRP group 1 on Router C.
[RouterC-GigabitEthernet1/0/1] display vrrp ipv6 verbose
IPv6 Virtual Router Information:
Running Mode : Load Balance
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 : 402ms left
Auth Type : None
Virtual IP : FE80::10
1::10
Member IP List : FE80::3 (Local, Backup)
FE80::1 (Master)
FE80::2 (Backup)
Forwarder Information: 3 Forwarders 1 Active
Config Weight : 255
Running Weight : 255
Forwarder 01
State : Listening
Virtual MAC : 000f-e2ff-4011 (Learnt)
Owner ID : 0000-5e01-1101
Priority : 127
Active : FE80::1
Forwarder 02
State : Listening
Virtual MAC : 000f-e2ff-4012 (Learnt)
Owner ID : 0000-5e01-1103
Priority : 127
Active : FE80::2
Forwarder 03
State : Active
Virtual MAC : 000f-e2ff-4013 (Owner)
Owner ID : 0000-5e01-1105
Priority : 255
Active : local
Forwarder Weight Track Information:
Track Object : 1 State : Positive Weight Reduced : 250
The output shows that Router A is the master in VRRP group 1, and each of the three routers has one AVF and two LVFs.
# Disconnect the link of GigabitEthernet 1/0/2 on 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 : Load Balance
Total number of virtual routers : 1
Interface GigabitEthernet1/0/1
VRID : 1 Adver Timer : 100
Admin Status : Up State : Master
Config Pri : 120 Running Pri : 120
Preempt Mode : Yes Delay Time : 5000
Auth Type : None
Virtual IP : FE80::10
1::10
Member IP List : FE80::1 (Local, Master)
FE80::2 (Backup)
FE80::3 (Backup)
Forwarder Information: 3 Forwarders 0 Active
Config Weight : 255
Running Weight : 5
Forwarder 01
State : Initialize
Virtual MAC : 000f-e2ff-4011 (Owner)
Owner ID : 0000-5e01-1101
Priority : 0
Active : FE80::3
Forwarder 02
State : Initialize
Virtual MAC : 000f-e2ff-4012 (Learnt)
Owner ID : 0000-5e01-1103
Priority : 0
Active : FE80::2
Forwarder 03
State : Initialize
Virtual MAC : 000f-e2ff-4013 (Learnt)
Owner ID : 0000-5e01-1105
Priority : 0
Active : FE80::3
Forwarder Weight Track Information:
Track Object : 1 State : Negative Weight Reduced : 250
# Display detailed information about VRRP group 1 on Router C.
[RouterC-GigabitEthernet1/0/1] display vrrp ipv6 verbose
IPv6 Virtual Router Information:
Running Mode : Load Balance
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 : 401ms left
Auth Type : None
Virtual IP : FE80::10
1::10
Member IP List : FE80::3 (Local, Backup)
FE80::1 (Master)
FE80::2 (Backup)
Forwarder Information: 3 Forwarders 2 Active
Config Weight : 255
Running Weight : 255
Forwarder 01
State : Active
Virtual MAC : 000f-e2ff-4011 (Take Over)
Owner ID : 0000-5e01-1101
Priority : 85
Active : local
Forwarder 02
State : Listening
Virtual MAC : 000f-e2ff-4012 (Learnt)
Owner ID : 0000-5e01-1103
Priority : 85
Active : FE80::2
Forwarder 03
State : Active
Virtual MAC : 000f-e2ff-4013 (Owner)
Owner ID : 0000-5e01-1105
Priority : 255
Active : local
Forwarder Weight Track Information:
Track Object : 1 State : Positive Weight Reduced : 250
The output shows that when GigabitEthernet 1/0/2 on Router A fails, the weights of the VFs on Router A drop below the lower limit of failure. All VFs on Router A transit to the Initialized state and cannot forward traffic. The VF for MAC address 000f-e2ff-4011 on Router C becomes the AVF to forward traffic.
# When the timeout timer (about 1800 seconds) expires, display detailed information about VRRP group 1 on Router C.
[RouterC-GigabitEthernet1/0/1] display vrrp ipv6 verbose
IPv6 Virtual Router Information:
Running Mode : Load Balance
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 : 400ms left
Auth Type : None
Virtual IP : FE80::10
1::10
Member IP List : FE80::3 (Local, Backup)
FE80::1 (Master)
FE80::2 (Backup)
Forwarder Information: 2 Forwarders 1 Active
Config Weight : 255
Running Weight : 255
Forwarder 02
State : Listening
Virtual MAC : 000f-e2ff-4012 (Learnt)
Owner ID : 0000-5e01-1103
Priority : 127
Active : FE80::2
Forwarder 03
State : Active
Virtual MAC : 000f-e2ff-4013 (Owner)
Owner ID : 0000-5e01-1105
Priority : 255
Active : local
Forwarder Weight Track Information:
Track Object : 1 State : Positive Weight Reduced : 250
The output shows that when the timeout timer expires, the VF for virtual MAC address 000f-e2ff-4011 is removed. The VF no longer forwards the packets destined for the MAC address.
# When Router A fails, display detailed information about VRRP group 1 on Router B.
[RouterB-GigabitEthernet1/0/1] display vrrp ipv6 verbose
IPv6 Virtual Router Information:
Running Mode : Load Balance
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
Member IP List : FE80::2 (Local, Master)
FE80::3 (Backup)
Forwarder Information: 2 Forwarders 1 Active
Config Weight : 255
Running Weight : 255
Forwarder 02
State : Active
Virtual MAC : 000f-e2ff-4012 (Owner)
Owner ID : 0000-5e01-1103
Priority : 255
Active : local
Forwarder 03
State : Listening
Virtual MAC : 000f-e2ff-4013 (Learnt)
Owner ID : 0000-5e01-1105
Priority : 127
Active : FE80::3
Forwarder Weight Track Information:
Track Object : 1 State : Positive Weight Reduced : 250
The output shows the following information:
When Router A fails, Router B becomes the master because it has a higher priority than Router C.
The VF for virtual MAC address 000f-e2ff-4011 is removed.