Networking Requirements

As shown in Figure 1, by configuring OSPF routing protocol on switch 1, switch 2 and switch 3, the three devices can exchange routing information with each other. We will implement the VRF function on Switch 1, Switch 2 and Switch 3 to segregate the users' routing spaces of different Tenants. We will create two VRFs on each device and run OSPF in these VRFs.

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-1/1/1

vrf1

VLANIF11: 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-1/1/2

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-1/1/5

vrf1

VLANIF 10: 101.251.201.3

Area: 0.0.0.0

Router ID: 2.2.2.2

vrf2

VLANIF 20: 201.251.201.3

Area: 0.0.0.0

Router ID: 2.2.2.2

Switch3

Te-1/1/5

vrf1

VLANIF 11: 100.251.201.3

Area: 1.1.1.1

Router ID: 3.3.3.3

vrf2

VLANIF 21: 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 interface gigabit-ethernet te-1/1/1 family ethernet-switching port-mode trunk
admin@switch1# set interface gigabit-ethernet te-1/1/1 family ethernet-switching vlan members 11
admin@switch1# set interface gigabit-ethernet te-1/1/1 family ethernet-switching vlan members 21
admin@switch1# set interface gigabit-ethernet te-1/1/1 family ethernet-switching vlan members 10
admin@switch1# set interface gigabit-ethernet te-1/1/2 family ethernet-switching port-mode trunk
admin@switch1# set interface gigabit-ethernet te-1/1/2 family ethernet-switching vlan members 10
admin@switch1# set interface gigabit-ethernet te-1/1/2 family ethernet-switching vlan members 20
admin@switch1# set l3-interface loopback vrf1 address 1.1.1.1 prefix-length 32
admin@switch1# set l3-interface vlan-interface vlan10 address 10.251.201.2 prefix-length 24
admin@switch1# set l3-interface vlan-interface vlan20 address 20.251.201.2 prefix-length 24
admin@switch1# set l3-interface vlan-interface vlan11 address 11.251.201.2 prefix-length 24
admin@switch1# set l3-interface vlan-interface vlan21 address 21.251.201.2 prefix-length 24
admin@switch1# set vlans vlan-id 10 l3-interface vlan10
admin@switch1# set vlans vlan-id 11 l3-interface vlan11
admin@switch1# set vlans vlan-id 20 l3-interface vlan20
admin@switch1# set vlans vlan-id 21 l3-interface vlan21

Step2 Configure VRF.

a. Enable IP routing function before using VRF function and configure the system hostname.

admin@switch1# set ip routing enable true
admin@switch1# set system hostname switch1

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 l3-interface vlan-interface vlan10 vrf vrf1
admin@switch1# set l3-interface vlan-interface vlan20 vrf vrf2
admin@switch1# set l3-interface vlan-interface vlan11 vrf vrf1
admin@switch1# set l3-interface vlan-interface vlan21 vrf vrf2

Step3 Configure basic OSPF functions.

admin@switch1# set protocols ospf vrf vrf1 router-id 1.1.1.1
admin@switch1# set protocols ospf vrf vrf1 network 10.251.201.0/24 area 0.0.0.0
admin@switch1# set protocols ospf vrf vrf1 network 11.251.201.0/24 area 1.1.1.1
admin@switch1# set protocols ospf vrf vrf2 router-id 1.1.1.1
admin@switch1# set protocols ospf vrf vrf2 network 20.251.201.0/24 area 0.0.0.0
admin@switch1# set protocols ospf vrf vrf2 network 21.251.201.0/24 area 1.1.1.1

Step4 Commit the configuration.

admin@Switch1# commit

Switch2

Step1 Configure the VLANs and VLAN interfaces.

admin@switch2# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching port-mode "trunk"
admin@switch2# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching vlan members 10
admin@switch2# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching vlan members 20
admin@switch2# set vlans vlan-id 10 l3-interface "vlan10"
admin@switch2# set vlans vlan-id 20 l3-interface "vlan20"
admin@switch2# set l3-interface vlan-interface vlan20 address 20.251.201.3 prefix-length 24
admin@switch2# set l3-interface vlan-interface vlan10 address 10.251.201.3 prefix-length 24

Step2 Configure VRF.

a. Enable IP routing function before using VRF function and set the system hostname.

admin@switch2# set ip routing enable true
admin@switch2# set system hostname "switch2"

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 l3-interface vlan-interface vlan10 vrf "vrf1"
admin@switch2# set l3-interface vlan-interface vlan20 vrf "vrf2"

Step3 Configure basic OSPF functions.

admin@switch2# set protocols ospf vrf vrf1 router-id 2.2.2.2
admin@switch2# set protocols ospf vrf vrf1 network 10.251.201.0/24 area 0.0.0.0
admin@switch2# set protocols ospf vrf vrf2 router-id 2.2.2.2
admin@switch2# set protocols ospf vrf vrf2 network 20.251.201.0/24 area 0.0.0.0

Step4 Commit the configuration.

admin@switch2# commit

Switch3

Step1 Configure the VLANs and VLAN interfaces.

admin@switch3# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching port-mode "trunk"
admin@switch3# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching vlan members 11
admin@switch3# set interface gigabit-ethernet ge-1/1/5 family ethernet-switching vlan members 21
admin@switch3# set vlans vlan-id 11 l3-interface "vlan11"
admin@switch3# set vlans vlan-id 21 l3-interface "vlan21"
admin@switch3# set l3-interface vlan-interface vlan11 address 11.251.201.4 prefix-length 24
admin@switch3# set l3-interface vlan-interface vlan21 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
admin@switch3# set system hostname "switch3"

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 l3-interface vlan-interface vlan11 vrf "vrf1"
admin@switch3# set l3-interface vlan-interface vlan21 vrf "vrf2"

Step3 Configure basic OSPF functions.

admin@switch3# set protocols ospf vrf vrf1 router-id 3.3.3.3
admin@switch3# set protocols ospf vrf vrf1 network 11.251.201.0/24 area 1.1.1.1
admin@switch3# set protocols ospf vrf vrf2 router-id 3.3.3.3
admin@switch3# set protocols ospf vrf vrf2 network 21.251.201.0/24 area 1.1.1.1

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            vlan10
vrf2         purple            vlan20

You can use the run show route vrf command to check the routing table information of the specific VRF.

admin@switch3# run show route vrf vrf1
show ip route vrf vrf1
=======================
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued route, r - rejected route


VRF vrf1:
K>* 0.0.0.0/0 [255/8192] unreachable (ICMP unreachable), 05:25:24
O>* 10.251.201.0/24 [110/20] via 11.251.201.2, vlan11, weight 1, 01:34:21
O   11.251.201.0/24 [110/10] is directly connected, vlan11, weight 1, 02:48:16
C>* 11.251.201.0/24 is directly connected, vlan11, 02:48:31



show ipv6 route vrf vrf1
=========================
Codes: K - kernel route, C - connected, S - static, R - RIPng,
       O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
       v - VNC, V - VNC-Direct, A - Babel, D - SHARP, F - PBR,
       f - OpenFabric,
       > - selected route, * - FIB route, q - queued route, r - rejected route


VRF vrf1:
C>* fe80::/64 is directly connected, vlan11, 02:48:29

To the check OSPF neighbor, run the command run show ospf vrf neighbor.

root@switch1# run show ospf vrf vrf1 neighbor
VRF Name: vrf1

Neighbor ID     Pri State           Dead Time Address         Interface                        RXmtL RqstL DBsmL
2.2.2.2           1 Full/DR           36.055s 10.251.201.3    vlan10:10.251.201.2                  0     0     0
3.3.3.3           1 Full/Backup       36.899s 11.251.201.4    vlan11:11.251.201.2                  0     0     0

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