Example: Configuring VRRP load balancing
Network configuration
As shown in Figure 53, Switch A, Switch B, and Switch C form a load-balanced VRRP group. They use the virtual IP address 10.1.1.1/24 to provide gateway service for subnet 10.1.1.0/24.
Configure VFs on Switch A, Switch B, and Switch C to monitor their respective VLAN-interface 3. When the interface on any one of them fails, the weights of the VFs on the problematic switch decrease so another AVF can take over.
Figure 53: Network diagram
Procedure
![[IMPORTANT: ]](images/important.png) | 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. | |
Configure Switch A:
# Configure VLAN 2.
<SwitchA> system-view [SwitchA] vlan 2 [SwitchA-vlan2] port [SwitchA-vlan2] quit
# Configure VRRP to operate in load balancing mode.
[SwitchA] vrrp mode load-balance
# Create VRRP group 1, and set its virtual IP address to 10.1.1.1.
[SwitchA] interface vlan-interface 2 [SwitchA-Vlan-interface2] ip address 10.1.1.2 24 [SwitchA-Vlan-interface2] vrrp vrid 1 virtual-ip 10.1.1.1
# Assign Switch A the highest priority in VRRP group 1, so Switch A can become the master.
[SwitchA-Vlan-interface2] vrrp vrid 1 priority 120
# 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 vrid 1 preempt-mode delay 5000 [SwitchA-Vlan-interface2] quit
# Create track entry 1 to monitor the upstream link status of VLAN-interface 3. When the upstream link fails, the track entry transits to Negative.
[SwitchA] track 1 interface vlan-interface 3
# 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.
[SwitchA] interface vlan-interface 2 [SwitchA-Vlan-interface2] vrrp vrid 1 track 1 weight reduced 250
Configure Switch B:
# Configure VLAN 2.
<SwitchB> system-view [SwitchB] vlan 2 [SwitchB-vlan2] port fortygige 1/0/5 [SwitchB-vlan2] quit
# Configure VRRP to operate in load balancing mode.
[SwitchB] vrrp mode load-balance
# Create VRRP group 1, and set its virtual IP address to 10.1.1.1.
[SwitchB] interface vlan-interface 2 [SwitchB-Vlan-interface2] ip address 10.1.1.3 24 [SwitchB-Vlan-interface2] vrrp vrid 1 virtual-ip 10.1.1.1
# Assign Switch B a higher priority than Switch C in VRRP group 1, so Switch B can become the master when Switch A fails.
[SwitchB-Vlan-interface2] vrrp vrid 1 priority 110
# Configure Switch B to operate in preemptive mode, and set the preemption delay to 5000 centiseconds.
[SwitchB-Vlan-interface2] vrrp vrid 1 preempt-mode delay 5000 [SwitchB-Vlan-interface2] quit
# Create track entry 1 to monitor the upstream link status of VLAN-interface 3. When the upstream link fails, the track entry transits to Negative.
[SwitchB] track 1 interface vlan-interface 3
# 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.
[SwitchB] interface vlan-interface 2 [SwitchB-Vlan-interface2] vrrp vrid 1 track 1 weight reduced 250
Configure Switch C:
# Configure VLAN 2.
<SwitchC> system-view [SwitchC] vlan 2 [SwitchC-vlan2] port fortygige 1/0/5 [SwitchC-vlan2] quit
# Configure VRRP to operate in load balancing mode.
[SwitchC] vrrp mode load-balance
# Create VRRP group 1, and set its virtual IP address to 10.1.1.1.
[SwitchC] interface vlan-interface 2 [SwitchC-Vlan-interface2] ip address 10.1.1.4 24 [SwitchC-Vlan-interface2] vrrp vrid 1 virtual-ip 10.1.1.1
# Configure Switch C to operate in preemptive mode, and set the preemption delay to 5000 centiseconds.
[SwitchC-Vlan-interface2] vrrp vrid 1 preempt-mode delay 5000 [SwitchC-Vlan-interface2] quit
# Create track entry 1 to monitor the upstream link status of VLAN-interface 3. When the upstream link fails, the track entry transits to Negative.
[SwitchC] track 1 interface vlan-interface 3
# 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.
[SwitchC] interface vlan-interface 2 [SwitchC-Vlan-interface2] vrrp 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 Switch A.
[SwitchA-Vlan-interface2] display vrrp verbose
IPv4 Virtual Router Information:
Running Mode : Load Balance
Total number of virtual routers : 1
Interface Vlan-interface2
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 : 10.1.1.1
Member IP List : 10.1.1.2 (Local, Master)
10.1.1.3 (Backup)
10.1.1.4 (Backup)
Forwarder Information: 3 Forwarders 1 Active
Config Weight : 255
Running Weight : 255
Forwarder 01
State : Active
Virtual MAC : 000f-e2ff-0011 (Owner)
Owner ID : 0000-5e01-1101
Priority : 255
Active : local
Forwarder 02
State : Listening
Virtual MAC : 000f-e2ff-0012 (Learnt)
Owner ID : 0000-5e01-1103
Priority : 127
Active : 10.1.1.3
Forwarder 03
State : Listening
Virtual MAC : 000f-e2ff-0013 (Learnt)
Owner ID : 0000-5e01-1105
Priority : 127
Active : 10.1.1.4
Forwarder Weight Track Information:
Track Object : 1 State : Positive Weight Reduced : 250
# Display detailed information about VRRP group 1 on Switch B.
[SwitchB-Vlan-interface2] display vrrp verbose
IPv4 Virtual Router Information:
Running Mode : Load Balance
Total number of virtual routers : 1
Interface Vlan-interface2
VRID : 1 Adver Timer : 100
Admin Status : Up State : Backup
Config Pri : 110 Running Pri : 110
Preempt Mode : Yes Delay Time : 5000
Become Master : 410ms left
Auth Type : None
Virtual IP : 10.1.1.1
Member IP List : 10.1.1.3 (Local, Backup)
10.1.1.2 (Master)
10.1.1.4 (Backup)
Forwarder Information: 3 Forwarders 1 Active
Config Weight : 255
Running Weight : 255
Forwarder 01
State : Listening
Virtual MAC : 000f-e2ff-0011 (Learnt)
Owner ID : 0000-5e01-1101
Priority : 127
Active : 10.1.1.2
Forwarder 02
State : Active
Virtual MAC : 000f-e2ff-0012 (Owner)
Owner ID : 0000-5e01-1103
Priority : 255
Active : local
Forwarder 03
State : Listening
Virtual MAC : 000f-e2ff-0013 (Learnt)
Owner ID : 0000-5e01-1105
Priority : 127
Active : 10.1.1.4
Forwarder Weight Track Information:
Track Object : 1 State : Positive Weight Reduced : 250
# Display detailed information about VRRP group 1 on Switch C.
[SwitchC-Vlan-interface2] display vrrp verbose
IPv4 Virtual Router Information:
Running Mode : Load Balance
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 : 401ms left
Auth Type : None
Virtual IP : 10.1.1.1
Member IP List : 10.1.1.4 (Local, Backup)
10.1.1.2 (Master)
10.1.1.3 (Backup)
Forwarder Information: 3 Forwarders 1 Active
Config Weight : 255
Running Weight : 255
Forwarder 01
State : Listening
Virtual MAC : 000f-e2ff-0011 (Learnt)
Owner ID : 0000-5e01-1101
Priority : 127
Active : 10.1.1.2
Forwarder 02
State : Listening
Virtual MAC : 000f-e2ff-0012 (Learnt)
Owner ID : 0000-5e01-1103
Priority : 127
Active : 10.1.1.3
Forwarder 03
State : Active
Virtual MAC : 000f-e2ff-0013 (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 Switch A is the master in VRRP group 1, and each of the three switches has one AVF and two LVFs.
# Disconnect the link of VLAN-interface 3 on Switch A, and display detailed information about VRRP group 1 on Switch A.
[SwitchA-Vlan-interface2] display vrrp verbose
IPv4 Virtual Router Information:
Running Mode : Load Balance
Total number of virtual routers : 1
Interface Vlan-interface2
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 : 10.1.1.1
Member IP List : 10.1.1.2 (Local, Master)
10.1.1.3 (Backup)
10.1.1.4 (Backup)
Forwarder Information: 3 Forwarders 0 Active
Config Weight : 255
Running Weight : 5
Forwarder 01
State : Initialize
Virtual MAC : 000f-e2ff-0011 (Owner)
Owner ID : 0000-5e01-1101
Priority : 0
Active : 10.1.1.4
Forwarder 02
State : Initialize
Virtual MAC : 000f-e2ff-0012 (Learnt)
Owner ID : 0000-5e01-1103
Priority : 0
Active : 10.1.1.3
Forwarder 03
State : Initialize
Virtual MAC : 000f-e2ff-0013 (Learnt)
Owner ID : 0000-5e01-1105
Priority : 0
Active : 10.1.1.4
Forwarder Weight Track Information:
Track Object : 1 State : Negative Weight Reduced : 250
# Display detailed information about VRRP group 1 on Switch C.
[SwitchC-Vlan-interface2] display vrrp verbose
IPv4 Virtual Router Information:
Running Mode : Load Balance
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 : 401ms left
Auth Type : None
Virtual IP : 10.1.1.1
Member IP List : 10.1.1.4 (Local, Backup)
10.1.1.2 (Master)
10.1.1.3 (Backup)
Forwarder Information: 3 Forwarders 2 Active
Config Weight : 255
Running Weight : 255
Forwarder 01
State : Active
Virtual MAC : 000f-e2ff-0011 (Take Over)
Owner ID : 0000-5e01-1101
Priority : 85
Active : local
Forwarder 02
State : Listening
Virtual MAC : 000f-e2ff-0012 (Learnt)
Owner ID : 0000-5e01-1103
Priority : 85
Active : 10.1.1.3
Forwarder 03
State : Active
Virtual MAC : 000f-e2ff-0013 (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 VLAN-interface 3 on Switch A fails, the weights of the VFs on Switch A drop below the lower limit of failure. All VFs on Switch A transit to the Initialize state and cannot forward traffic. The VF for MAC address 000f-e2ff-0011 on Switch C becomes the AVF to forward traffic.
# When the timeout timer (about 1800 seconds) expires, display detailed information about VRRP group 1 on Switch C.
[SwitchC-Vlan-interface2] display vrrp verbose
IPv4 Virtual Router Information:
Running Mode : Load Balance
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 : 402ms left
Auth Type : None
Virtual IP : 10.1.1.1
Member IP List : 10.1.1.4 (Local, Backup)
10.1.1.2 (Master)
10.1.1.3 (Backup)
Forwarder Information: 2 Forwarders 1 Active
Config Weight : 255
Running Weight : 255
Forwarder 02
State : Listening
Virtual MAC : 000f-e2ff-0012 (Learnt)
Owner ID : 0000-5e01-1103
Priority : 127
Active : 10.1.1.3
Forwarder 03
State : Active
Virtual MAC : 000f-e2ff-0013 (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-0011 is removed. The VF no longer forwards the packets destined for the MAC address.
# When Switch A fails, display detailed information about VRRP group 1 on Switch B.
[SwitchB-Vlan-interface2] display vrrp verbose
IPv4 Virtual Router Information:
Running Mode : Load Balance
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 : 10.1.1.1
Member IP List : 10.1.1.3 (Local, Master)
10.1.1.4 (Backup)
Forwarder Information: 2 Forwarders 1 Active
Config Weight : 255
Running Weight : 255
Forwarder 02
State : Active
Virtual MAC : 000f-e2ff-0012 (Owner)
Owner ID : 0000-5e01-1103
Priority : 255
Active : local
Forwarder 03
State : Listening
Virtual MAC : 000f-e2ff-0013 (Learnt)
Owner ID : 0000-5e01-1105
Priority : 127
Active : 10.1.1.4
Forwarder Weight Track Information:
Track Object : 1 State : Positive Weight Reduced : 250
The output shows the following information:
When Switch A fails, Switch B becomes the master because it has a higher priority than Switch C.
The VF for virtual MAC address 000f-e2ff-0011 is removed.