Example for Configuring a VRRP Group in Redundancy Mode
Networking Requirements
The host uses SwitchA as the default gateway to connect to the Internet. When SwitchA becomes faulty, SwitchB functions as the gateway. This implements gateway backup.
After SwitchA recovers, it becomes the master again to transmit data after a preemption delay of 20s.
In this scenario, to avoid loops, ensure that all connected interfaces have STP disabled and connected interfaces are removed from VLAN 1. If STP is enabled and VLANIF interfaces of switches are used to construct a Layer 3 ring network, an interface on the network will be blocked. As a result, Layer 3 services on the network cannot run normally.
Device |
Interface |
VLANIF Interface |
IP Address |
|---|---|---|---|
SwitchA |
GE1/0/1 |
VLANIF 300 |
192.168.1.1/24 |
GE1/0/2 |
VLANIF 100 |
10.1.1.1/24 |
|
SwitchB |
GE1/0/1 |
VLANIF 200 |
192.168.2.1/24 |
GE1/0/2 |
VLANIF 100 |
10.1.1.2/24 |
|
SwitchC |
GE1/0/1 |
VLANIF 300 |
192.168.1.2/24 |
GE1/0/2 |
VLANIF 200 |
192.168.2.2/24 |
|
GE1/0/3 |
VLANIF 400 |
172.16.1.1/24 |
Configuration Roadmap
The configuration roadmap is as follows:
- Assign an IP address to each interface and configure a routing protocol to ensure network connectivity.
- Configure a VRRP group on SwitchA and SwitchB and set a higher priority for SwitchA so that SwitchA functions as the master to forward traffic. Then, set the preemption delay to 20s on SwitchA, and set a lower priority for SwitchB so that SwitchB functions as the backup.
Procedure
- Configure devices to ensure network connectivity.
# Assign an IP address to each interface. SwitchA is used as an example. The configurations of SwitchB and SwitchC are similar to the configuration of SwitchA. For details, see the configuration files.
<Quidway> system-view [Quidway] sysname SwitchA [SwitchA] vlan batch 100 300 [SwitchA] interface gigabitethernet 1/0/1 [SwitchA-GigabitEthernet1/0/1] port hybrid pvid vlan 300 [SwitchA-GigabitEthernet1/0/1] port hybrid untagged vlan 300 [SwitchA-GigabitEthernet1/0/1] quit [SwitchA] interface gigabitethernet 1/0/2 [SwitchA-GigabitEthernet1/0/2] port hybrid pvid vlan 100 [SwitchA-GigabitEthernet1/0/2] port hybrid untagged vlan 100 [SwitchA-GigabitEthernet1/0/2] quit [SwitchA] interface vlanif 100 [SwitchA-Vlanif100] ip address 10.1.1.1 24 [SwitchA-Vlanif100] quit [SwitchA] interface vlanif 300 [SwitchA-Vlanif300] ip address 192.168.1.1 24 [SwitchA-Vlanif300] quit
# Configure Layer 2 transmission on the switch.
<Quidway> system-view [Quidway] sysname Switch [Switch] vlan 100 [Switch-vlan100] quit [Switch] interface gigabitethernet 1/0/1 [Switch-GigabitEthernet1/0/1] port hybrid pvid vlan 100 [Switch-GigabitEthernet1/0/1] port hybrid untagged vlan 100 [Switch-GigabitEthernet1/0/1] quit [Switch] interface gigabitethernet 1/0/2 [Switch-GigabitEthernet1/0/2] port hybrid pvid vlan 100 [Switch-GigabitEthernet1/0/2] port hybrid untagged vlan 100 [Switch-GigabitEthernet1/0/2] quit
# Configure OSPF between SwitchA, SwitchB, and SwitchC. SwitchA is used as an example. The configurations of SwitchB and SwitchC are similar to the configuration of SwitchA. For details, see the configuration files.
[SwitchA] ospf 1 [SwitchA-ospf-1] area 0 [SwitchA-ospf-1-area-0.0.0.0] network 10.1.1.0 0.0.0.255 [SwitchA-ospf-1-area-0.0.0.0] network 192.168.1.0 0.0.0.255 [SwitchA-ospf-1-area-0.0.0.0] quit [SwitchA-ospf-1] quit
- Configure VRRP groups.
# Configure VRRP group 1 on SwitchA, and set the priority of SwitchA to 120 and the preemption delay to 20s.
[SwitchA] interface vlanif 100 [SwitchA-Vlanif100] vrrp vrid 1 virtual-ip 10.1.1.111 [SwitchA-Vlanif100] vrrp vrid 1 priority 120 [SwitchA-Vlanif100] vrrp vrid 1 preempt-mode timer delay 20 [SwitchA-Vlanif100] quit
# Configure VRRP group 1 on SwitchB. SwitchB uses default value 100.
[SwitchB] interface vlanif 100 [SwitchB-Vlanif100] vrrp vrid 1 virtual-ip 10.1.1.111 [SwitchB-Vlanif100] quit
- Verify the configuration.
# After the configuration is complete, run the display vrrp command on SwitchA and SwitchB. You can see that SwitchA is in Master state and SwitchB is in Backup state.
[SwitchA] display vrrp Vlanif100 | Virtual Router 1 State : Master Virtual IP : 10.1.1.111 Master IP : 10.1.1.1 PriorityRun : 120 PriorityConfig : 120 MasterPriority : 120 Preempt : YES Delay Time : 20 s TimerRun : 1 s TimerConfig : 1 s Auth type : NONE Virtual MAC : 0000-5e00-0101 Check TTL : YES Config type : normal-vrrp Backup-forward : disabled Create time : 2012-01-12 20:15:46 Last change time : 2012-01-12 20:15:46[SwitchB] display vrrp Vlanif100 | Virtual Router 1 State : Backup Virtual IP : 10.1.1.111 Master IP : 10.1.1.1 PriorityRun : 100 PriorityConfig : 100 MasterPriority : 120 Preempt : YES Delay Time : 0 s TimerRun : 1 s TimerConfig : 1 s Auth type : NONE Virtual MAC : 0000-5e00-0101 Check TTL : YES Config type : normal-vrrp Backup-forward : disabled Create time : 2012-01-12 20:15:46 Last change time : 2012-01-12 20:15:46# Run the display ip routing-table command on SwitchA and SwitchB. The command output shows that a direct route to the virtual IP address exists in the routing table of SwitchA and an OSPF route to the virtual IP address exists in the routing table of SwitchB. The command output on SwitchA and SwitchB is as follows:
[SwitchA] display ip routing-table Route Flags: R - relay, D - download to fib, T - to vpn-instance ------------------------------------------------------------------------------ Routing Tables: Public Destinations : 9 Routes : 10 Destination/Mask Proto Pre Cost Flags NextHop Interface 10.1.1.0/24 Direct 0 0 D 10.1.1.1 Vlanif100 10.1.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif100 10.1.1.111/32 Direct 0 0 D 127.0.0.1 Vlanif100 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 172.16.1.0/24 OSPF 10 2 D 192.168.1.2 Vlanif300 192.168.1.0/24 Direct 0 0 D 192.168.1.1 Vlanif300 192.168.1.1/32 Direct 0 0 D 127.0.0.1 Vlanif300 192.168.2.0/24 OSPF 10 2 D 10.1.1.2 Vlanif100 OSPF 10 2 D 192.168.1.2 Vlanif300
[SwitchB] display ip routing-table Route Flags: R - relay, D - download to fib, T - to vpn-instance ------------------------------------------------------------------------------ Routing Tables: Public Destinations : 9 Routes : 10 Destination/Mask Proto Pre Cost Flags NextHop Interface 10.1.1.0/24 Direct 0 0 D 10.1.1.2 Vlanif100 10.1.1.2/32 Direct 0 0 D 127.0.0.1 Vlanif100 10.1.1.111/32 OSPF 10 2 D 10.1.1.1 Vlanif100 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 172.16.1.0/24 OSPF 10 2 D 192.168.2.2 Vlanif200 192.168.1.0/24 OSPF 10 2 D 10.1.1.1 Vlanif100 OSPF 10 2 D 192.168.2.2 Vlanif200 192.168.2.0/24 Direct 0 0 D 192.168.2.1 Vlanif200 192.168.2.1/32 Direct 0 0 D 127.0.0.1 Vlanif200
# Run the shutdown command on GE1/0/2 of SwitchA to simulate a link fault.
[SwitchA] interface gigabitethernet 1/0/2 [SwitchA-GigabitEthernet1/0/2] shutdown [SwitchA-GigabitEthernet1/0/2] quit
# Run the display vrrp command on SwitchB to view the VRRP status. The command output shows that SwitchB is in Master state.
[SwitchB] display vrrp Vlanif100 | Virtual Router 1 State : Master Virtual IP : 10.1.1.111 Master IP : 10.1.1.2 PriorityRun : 100 PriorityConfig : 100 MasterPriority : 100 Preempt : YES Delay Time : 0 s TimerRun : 1 s TimerConfig : 1 s Auth type : NONE Virtual MAC : 0000-5e00-0101 Check TTL : YES Config type : normal-vrrp Backup-forward : disabled Create time : 2012-01-12 20:15:46 Last change time : 2012-01-12 20:18:40# Run the undo shutdown command on GE1/0/2 of SwitchA.
[SwitchA] interface gigabitethernet 1/0/2 [SwitchA-GigabitEthernet1/0/2] undo shutdown [SwitchA-GigabitEthernet1/0/2] quit
# After 20s, run the display vrrp command on SwitchA to view the VRRP status. SwitchA restores the Master state.
[SwitchA] display vrrp Vlanif100 | Virtual Router 1 State : Master Virtual IP : 10.1.1.111 Master IP : 10.1.1.1 PriorityRun : 120 PriorityConfig : 120 MasterPriority : 120 Preempt : YES Delay Time : 20 s TimerRun : 1 s TimerConfig : 1 s Auth type : NONE Virtual MAC : 0000-5e00-0101 Check TTL : YES Config type : normal-vrrp Backup-forward : disabled Create time : 2012-01-12 20:15:46 Last change time : 2012-01-12 20:20:56
Configuration Files
SwitchA configuration file
# sysname SwitchA # vlan batch 100 300 # interface Vlanif100 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 preempt-mode timer delay 20 # interface Vlanif300 ip address 192.168.1.1 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 300 port hybrid untagged vlan 300 # interface GigabitEthernet1/0/2 port hybrid pvid vlan 100 port hybrid untagged vlan 100 # 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
SwitchB configuration file
# sysname SwitchB # vlan batch 100 200 # interface Vlanif100 ip address 10.1.1.2 255.255.255.0 vrrp vrid 1 virtual-ip 10.1.1.111 # interface Vlanif200 ip address 192.168.2.1 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 200 port hybrid untagged vlan 200 # interface GigabitEthernet1/0/2 port hybrid pvid vlan 100 port hybrid untagged vlan 100 # 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
SwitchC configuration file
# sysname SwitchC # vlan batch 200 300 400 # interface Vlanif200 ip address 192.168.2.2 255.255.255.0 # interface Vlanif300 ip address 192.168.1.2 255.255.255.0 # interface Vlanif400 ip address 172.16.1.1 255.255.255.0 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 300 port hybrid untagged vlan 300 # interface GigabitEthernet1/0/2 port hybrid pvid vlan 200 port hybrid untagged vlan 200 # interface GigabitEthernet1/0/3 port hybrid pvid vlan 400 port hybrid untagged vlan 400 # ospf 1 area 0.0.0.0 network 172.16.1.0 0.0.0.255 network 192.168.1.0 0.0.0.255 network 192.168.2.0 0.0.0.255 # return
Switch configuration file
# sysname Switch # vlan batch 100 # interface GigabitEthernet1/0/1 port hybrid pvid vlan 100 port hybrid untagged vlan 100 # interface GigabitEthernet1/0/2 port hybrid pvid vlan 100 port hybrid untagged vlan 100 # return