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Example for Configuring VRRP on a Dot1q Termination Sub-interface
Networking Requirements
In Figure 3-22, hosts on a LAN are dual-homed to SwitchA and SwitchB through the switch. User packets sent from the switch carry one tag. The requirements are as follows:
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 resumes control within 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.
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 sub-interfaces of SwitchA and SwitchB, set the preemption delay to 20s and a higher priority for SwitchA so that SwitchA functions as the master to forward traffic, 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] interface gigabitethernet 2/0/0.1 [SwitchA-GigabitEthernet2/0/0.1] ip address 10.1.1.1 24 [SwitchA-GigabitEthernet2/0/0.1] quit [SwitchA] interface gigabitethernet 1/0/0 [SwitchA-GigabitEthernet1/0/0] undo portswitch [SwitchA-GigabitEthernet1/0/0] ip address 192.168.2.1 24 [SwitchA-GigabitEthernet1/0/0] quit
# Configure Layer 2 forwarding on the switch.
<Quidway> system-view [Quidway] sysname Switch [Switch] vlan 10 [Switch-vlan10] quit [Switch] interface gigabitethernet 1/0/0 [Switch-GigabitEthernet1/0/0] port link-type access [Switch-GigabitEthernet1/0/0] port default vlan 10 [Switch-GigabitEthernet1/0/0] quit [Switch] interface gigabitethernet 1/0/1 [Switch-GigabitEthernet1/0/1] port link-type trunk [Switch-GigabitEthernet1/0/1] port trunk allow-pass vlan 10 [Switch-GigabitEthernet1/0/1] quit [Switch] interface gigabitethernet 1/0/2 [Switch-GigabitEthernet1/0/2] port link-type trunk [Switch-GigabitEthernet1/0/2] port trunk allow-pass vlan 10 [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 192.168.2.0 0.0.0.255 [SwitchA-ospf-1-area-0.0.0.0] quit [SwitchA-ospf-1] quit
- Configure VRRP on a Dot1q termination sub-interface.
# Configure VRRP group 1 on GE2/0/0.1 of SwitchA, and set the priority of SwitchA to 120 and the preemption delay to 20s.
[SwitchA] interface gigabitethernet 2/0/0.1 [SwitchA-GigabitEthernet2/0/0.1] dot1q termination vid 10 [SwitchA-GigabitEthernet2/0/0.1] arp broadcast enable [SwitchA-GigabitEthernet2/0/0.1] dot1q vrrp vid 10 [SwitchA-GigabitEthernet2/0/0.1] vrrp vrid 1 virtual-ip 10.1.1.111 [SwitchA-GigabitEthernet2/0/0.1] vrrp vrid 1 priority 120 [SwitchA-GigabitEthernet2/0/0.1] vrrp vrid 1 preempt-mode timer delay 20 [SwitchA-GigabitEthernet2/0/0.1] quit
# Configure VRRP group 1 on GE2/0/0.1 of SwitchB, and set the default priority of 100 for SwitchB.
[SwitchB] interface gigabitethernet 2/0/0.1 [SwitchB-GigabitEthernet2/0/0.1] dot1q termination vid 10 [SwitchB-GigabitEthernet2/0/0.1] arp broadcast enable [SwitchB-GigabitEthernet2/0/0.1] dot1q vrrp vid 10 [SwitchB-GigabitEthernet2/0/0.1] vrrp vrid 1 virtual-ip 10.1.1.111 [SwitchB-GigabitEthernet2/0/0.1] quit
- Verify the configuration.
# 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 GigabitEthernet2/0/0.1 | 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 : 2012-05-30 21:25:47 Last change time : 2012-05-30 21:25:51[SwitchB] display vrrp GigabitEthernet2/0/0.1 | 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 : 2012-05-30 21:25:47 Last change time : 2012-05-30 21:25:51# 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.
[SwitchA] display ip routing-table Route Flags: R - relay, D - download to fib, T - to vpn-instance ------------------------------------------------------------------------------ Routing Tables: Public Destinations : 8 Routes : 9 Destination/Mask Proto Pre Cost Flags NextHop Interface 10.1.1.0/24 Direct 0 0 D 10.1.1.1 GigabitEthernet2/0/0.1 10.1.1.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet2/0/0.1 10.1.1.111/32 Direct 0 0 D 127.0.0.1 GigabitEthernet2/0/0.1 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 192.168.1.0/24 OSPF 10 2 D 192.168.2.2 GigabitEthernet1/0/0 OSPF 10 2 D 10.1.1.2 GigabitEthernet2/0/0.1 192.168.2.0/24 Direct 0 0 D 192.168.2.1 GigabitEthernet1/0/0 192.168.2.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet1/0/0
[SwitchB] display ip routing-table Route Flags: R - relay, D - download to fib, T - to vpn-instance ------------------------------------------------------------------------------ Routing Tables: Public Destinations : 8 Routes : 9 Destination/Mask Proto Pre Cost Flags NextHop Interface 10.1.1.0/24 Direct 0 0 D 10.1.1.2 GigabitEthernet2/0/0.1 10.1.1.2/32 Direct 0 0 D 127.0.0.1 GigabitEthernet2/0/0.1 10.1.1.111/32 OSPF 10 2 D 10.1.1.1 GigabitEthernet2/0/0.1 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0 192.168.1.0/24 Direct 0 0 D 192.168.1.1 GigabitEthernet1/0/0 192.168.1.1/32 Direct 0 0 D 127.0.0.1 GigabitEthernet1/0/0 192.168.2.0/24 OSPF 10 2 D 192.168.1.2 GigabitEthernet1/0/0 OSPF 10 2 D 10.1.1.1 GigabitEthernet2/0/0.1
# Run the shutdown command on GE2/0/0.1 of SwitchA to simulate a link fault.
[SwitchA] interface gigabitethernet 2/0/0.1 [SwitchA-GigabitEthernet2/0/0.1] shutdown [SwitchA-GigabitEthernet2/0/0.1] quit
# Run the display vrrp command on SwitchA and SwitchB. You can see that SwitchA is in Initialize state and SwitchB is in Master state.
[SwitchA] display vrrp GigabitEthernet2/0/0.1 | Virtual Router 1 State : Initialize Virtual IP : 10.1.1.111 Master IP : 0.0.0.0 PriorityRun : 120 PriorityConfig : 120 MasterPriority : 0 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 : 2012-05-30 21:27:47 Last change time : 2012-05-30 21:27:51[SwitchB] display vrrp GigabitEthernet2/0/0.1 | 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 : 2012-05-30 21:27:47 Last change time : 2012-05-30 21:27:51# Run the undo shutdown command on GE2/0/0.1 of SwitchA.
[SwitchA] interface gigabitethernet 2/0/0.1 [SwitchA-GigabitEthernet2/0/0.1] undo shutdown [SwitchA-GigabitEthernet2/0/0.1] quit
# After 20s, 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 GigabitEthernet2/0/0.1 | 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 : 2012-05-30 21:28:47 Last change time : 2012-05-30 21:28:51[SwitchB] display vrrp GigabitEthernet2/0/0.1 | 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 : 2012-05-30 21:28:47 Last change time : 2012-05-30 21:28:51
Configuration Files
SwitchA configuration file
# sysname SwitchA # interface GigabitEthernet1/0/0 undo portswitch ip address 192.168.2.1 255.255.255.0 # interface GigabitEthernet2/0/0.1 dot1q termination vid 10 dot1q vrrp vid 10 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 arp broadcast enable # 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
SwitchB configuration file
# sysname SwitchB # interface GigabitEthernet1/0/0 undo portswitch ip address 192.168.1.1 255.255.255.0 # interface GigabitEthernet2/0/0.1 dot1q termination vid 10 dot1q vrrp vid 10 ip address 10.1.1.2 255.255.255.0 vrrp vrid 1 virtual-ip 10.1.1.111 arp broadcast enable # 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
SwitchC configuration file
# sysname SwitchC # interface GigabitEthernet1/0/0 undo portswitch ip address 192.168.2.2 255.255.255.0 # interface GigabitEthernet2/0/0 undo portswitch ip address 192.168.1.2 255.255.255.0 # 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 # return
Switch configuration file
# sysname Switch # vlan batch 10 # interface GigabitEthernet1/0/0 port link-type access port default vlan 10 # interface GigabitEthernet1/0/1 port link-type trunk port trunk allow-pass vlan 10 # interface GigabitEthernet1/0/2 port link-type trunk port trunk allow-pass vlan 10 # return