Example for Configuring OSPF with Different VRFs
- Tracy Yang (Unlicensed)
Networking Requirements
As shown in Figure 1, by configuring OSPF routing protocol on switch 1, switch 2 and switch 3, the three devices can communicate with each other normally. Meanwhile we will implement the VRF function on Switch 1, Switch 2 and Switch 3 to segregate the users' routing spaces of different Tenants.
Figure1. User Configuration Topology of OSPF with Different VRFs
Basic Deployment
Figure 1 shows the user configuration topology of OSPF with different VRFs. Follow the configuration roadmap below to complete the configuration.
- Configure IP addresses and VLANs for the VLAN interfaces on switches to establish communication within the network segments.
- Configure basic OSPF functions on each switch. Configure Switch 1 as the ABR to divide the OSPF network into two areas (Area: 0.0.0.0 and Area: 1.1.1.1), so that the entire OSPF network can be extended using the area where Switch 1 and Switch 2 are located as the backbone area.
- In order to make different tenants have different routing space, configure two VRFs on each of the three switches.
Networking Address Planning
The networking IP address planning is shown in the following table.
Switch | Physical Interface | VRF and VLAN Interface | OSPF Configurations |
Switch1 | Te-1/1/3 | vrf1 VLANIF 11: 11.251.201.2 | Area: 1.1.1.1 Router ID: 1.1.1.1 |
vrf2 VLANIF 21: 21.251.201.2 | Area: 1.1.1.1 Router ID: 1.1.1.1 | ||
Te-1/1/4 | vrf1 VLANIF 10: 10.251.201.2 | Area: 0.0.0.0 Router ID: 1.1.1.1 | |
vrf2 VLANIF 20: 20.251.201.2 | Area: 0.0.0.0 Router ID: 1.1.1.1 | ||
Switch2 | Te-1/1/4 | vrf1 VLANIF 101: 101.251.201.3 | Area: 0.0.0.0 Router ID: 2.2.2.2 |
vrf2 VLANIF 201: 201.251.201.3 | Area: 0.0.0.0 Router ID: 2.2.2.2 | ||
Switch3 | Te-1/1/3 | vrf1 VLANIF 100: 100.251.201.3 | Area: 1.1.1.1 Router ID: 3.3.3.3 |
vrf2 VLANIF 200: 200.251.201.3 | Area: 1.1.1.1 Router ID: 3.3.3.3 |
Procedure
Configure Switch 1, Switch 2 and Switch 3 according to the networking requirements described above.
Switch1
Step1 Configure the VLANs and VLAN interfaces.
admin@Switch1# set vlans vlan-id 10 admin@Switch1# set vlans vlan-id 20 admin@Switch1# set vlans vlan-id 11 admin@Switch1# set vlans vlan-id 21 admin@Switch1# set interface gigabit-ethernet te-1/1/3 family ethernet-switching port-mode trunk admin@Switch1# set interface gigabit-ethernet te-1/1/3 family ethernet-switching vlan members 11 admin@Switch1# set interface gigabit-ethernet te-1/1/3 family ethernet-switching vlan members 21 admin@Switch1# set interface gigabit-ethernet te-1/1/4 family ethernet-switching port-mode trunk admin@Switch1# set interface gigabit-ethernet te-1/1/4 family ethernet-switching vlan members 10 admin@Switch1# set interface gigabit-ethernet te-1/1/4 family ethernet-switching vlan members 20 admin@Switch1# set vlans vlan-id 10 l3-interface vlan10 admin@Switch1# set vlans vlan-id 20 l3-interface vlan20 admin@Switch1# set vlans vlan-id 11 l3-interface vlan11 admin@Switch1# set vlans vlan-id 21 l3-interface vlan21 admin@Switch1# set vlan-interface interface vlan10 vif vlan10 address 10.251.201.2 prefix-length 24 admin@Switch1# set vlan-interface interface vlan20 vif vlan20 address 20.251.201.2 prefix-length 24 admin@Switch1# set vlan-interface interface vlan11 vif vlan11 address 11.251.201.2 prefix-length 24 admin@Switch1# set vlan-interface interface vlan21 vif vlan21 address 21.251.201.2 prefix-length 24
Step2 Configure VRF.
a. Enable IP routing function before using VRF function.
admin@Switch1# set ip routing enable true
b. Create VRFs.
admin@Switch1# set ip vrf vrf1 description orange admin@Switch1# set ip vrf vrf2 description purple
c. Bind the Layer 3 VLAN interface to the VRF.
admin@Switch1# set vlan-interface interface vlan10 vrf vrf1 admin@Switch1# set vlan-interface interface vlan11 vrf vrf1 admin@Switch1# set vlan-interface interface vlan20 vrf vrf2 admin@Switch1# set vlan-interface interface valn21 vrf vrf2
Step3 Configure basic OSPF functions.
admin@Switch1# set protocols ospf4 vrf vrf1 router-id 1.1.1.1 admin@Switch1# set protocols ospf4 vrf vrf1 area 0.0.0.0 interface vlan10 vif vlan10 address 10.251.201.2 admin@Switch1# set protocols ospf4 vrf vrf1 area 0.0.0.0 interface vlan11 vif vlan11 address 11.251.201.2 admin@Switch1# set protocols ospf4 vrf vrf2 router-id 1.1.1.1 admin@Switch1# set protocols ospf4 vrf vrf2 area 0.0.0.0 interface vlan20 vif vlan20 address 20.251.201.2 admin@Switch1# set protocols ospf4 vrf vrf2 area 0.0.0.0 interface vlan21 vif vlan21 address 21.251.201.2
Step4 Commit the configuration.
admin@Switch1# commit
Switch2
Step1 Configure the VLANs and VLAN interfaces.
admin@Switch2# set vlans vlan-id 101 admin@Switch2# set vlans vlan-id 201 admin@Switch2# set interface gigabit-ethernet te-1/1/4 family ethernet-switching port-mode trunk admin@Switch2# set interface gigabit-ethernet te-1/1/4 family ethernet-switching vlan members 101 admin@Switch2# set interface gigabit-ethernet te-1/1/4 family ethernet-switching vlan members 201 admin@Switch2# set vlans vlan-id 101 l3-interface vlan101 admin@Switch2# set vlans vlan-id 201 l3-interface vlan201 admin@Switch2# set vlan-interface interface vlan101 vif vlan101 address 10.251.201.3 prefix-length 24 admin@Switch2# set vlan-interface interface vlan201 vif vlan201 address 20.251.201.3 prefix-length 24
Step2 Configure VRF.
a. Enable IP routing function before using VRF function.
admin@Switch2# set ip routing enable true
b. Create VRFs.
admin@Switch2# set ip vrf vrf1 description orange admin@Switch2# set ip vrf vrf2 description purple
c. Bind the Layer 3 VLAN interface to the VRF.
admin@Switch2# set vlan-interface interface vlan101 vrf vrf1 admin@Switch2# set vlan-interface interface vlan201 vrf vrf2
Step3 Configure basic OSPF functions.
admin@Switch2# set protocols ospf4 vrf vrf1 router-id 2.2.2.2 admin@Switch2# set protocols ospf4 vrf vrf1 area 0.0.0.0 interface vlan101 vif vlan101 address 10.251.201.3 admin@Switch2# set protocols ospf4 vrf vrf2 router-id 2.2.2.2 admin@Switch2# set protocols ospf4 vrf vrf2 area 0.0.0.0 interface vlan201 vif vlan201 address 20.251.201.3
Step4 Commit the configuration.
admin@Switch2# commit
Switch3
Step1 Configure the VLANs and VLAN interfaces.
admin@Switch3# set vlans vlan-id 100 admin@Switch3# set vlans vlan-id 200 admin@Switch3# set interface gigabit-ethernet te-1/1/3 family ethernet-switching port-mode trunk admin@Switch3# set interface gigabit-ethernet te-1/1/3 family ethernet-switching vlan members 10 admin@Switch3# set interface gigabit-ethernet te-1/1/3 family ethernet-switching vlan members 200 admin@Switch3# set vlans vlan-id 100 l3-interface vlan100 admin@Switch3# set vlans vlan-id 200 l3-interface vlan200 admin@Switch3# set vlan-interface interface vlan100 vif vlan100 address 11.251.201.4 prefix-length 24 admin@Switch3# set vlan-interface interface vlan200 vif vlan200 address 21.251.201.4 prefix-length 24
Step2 Configure VRF.
a. Enable IP routing function before using VRF function.
admin@Switch3# set ip routing enable true
b. Create VRFs.
admin@Switch3# set ip vrf vrf1 description orange admin@Switch3# set ip vrf vrf2 description purple
c. Bind the Layer 3 VLAN interface to the VRF.
admin@Switch3# set vlan-interface interface vlan100 vrf vrf1 admin@Switch3# set vlan-interface interface vlan200 vrf vrf2
Step3 Configure basic OSPF functions.
admin@Switch3# set protocols ospf4 vrf vrf1 router-id 3.3.3.3 admin@Switch3# set protocols ospf4 vrf vrf1 area 1.1.1.1 interface vlan100 vif vlan100 address 10.251.201.4 admin@Switch3# set protocols ospf4 vrf vrf2 router-id 3.3.3.3 admin@Switch3# set protocols ospf4 vrf vrf2 area 1.1.1.1 interface vlan200 vif vlan200 address 20.251.201.4
Step4 Commit the configuration.
admin@Switch3# commit
Verify the Configuration
- You can use the run show vrf command to view the binding information between VRFs and the Layer 3 VLAN interfaces.
admin@Switch1# run show vrf Vrf Description Vlan-Interfaces ---------- --------------- --------------------- vrf1 orange vlan10,vlan11 vrf2 purple vlan20,vlan21 admin@Switch2# run show vrf Vrf Description Vlan-Interfaces ---------- --------------- ------------------ vrf1 orange vlan101 vrf2 purple vlan201
- You can use the run show route vrf command to check the routing table information of the specific VRF.
admin@Switch2# run show route vrf vrf1 IPv4 Routing table: 3 routes 10.251.201.3/32 [local(0)/0] > via vlan101/vlan101 10.251.201.0/24 [connected(0)/0] > via vlan101/vlan101 11.251.201.0/24 [ospf(110)/2] > to 10.251.201.2 via vlan101/vlan101 IPv6 Routing table: 1 routes fe80::e6f0:4ff:212:173a/128[local(0)/0] > via vlan101/vlan101 admin@Switch2# run show route vrf vrf2 IPv4 Routing table: 3 routes 20.251.201.3/32 [local(0)/0] > via vlan201/vlan201 20.251.201.0/24 [connected(0)/0] > via vlan201/vlan201 21.251.201.0/24 [ospf(110)/2] > to 20.251.201.2 via vlan201/vlan201 IPv6 Routing table: 1 routes fe80::e6f0:4ff:312:173a/128[local(0)/0] > via vlan201/vlan201
Copyright © 2025 Pica8 Inc. All Rights Reserved.