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Configuring OSPF between vEdges and Site Routers

Created by Deepak Sharma in Cisco SD-WAN Labs 19 Jul 2025

«Configuring & Deploying Device Templates ...

This SD-WAN lab practical will show you how to configure Feature Templates for OSPF for VPN0. You can practice along with this practical using our SD-WAN virtual lab.

Topology

Image description

Tasks

Configure hostname as “Site-x” on all site routers where x is the site number.

ConfigureIP addresses of Site-x routers and their loopback interfaces as per the below IP schema.

Site-1
Interfaces	IP Address	Subnet Mask
Eth0/0	10.1.2.2	255.255.255.0
Loopback1	10.1.11.1	255.255.255.0
Loopback2	10.1.12.1	255.255.255.0
Loopback3	10.1.13.1	255.255.255.0
Site-2
Eth0/0	172.16.5.2	255.255.255.0
Loopback1	10.1.21.1	255.255.255.0
Loopback2	10.1.22.1	255.255.255.0
Loopback3	10.1.23.1	255.255.255.0
Site-3
Eth0/0	192.168.6.2	255.255.255.0
Loopback1	10.1.31.1	255.255.255.0
Loopback2	10.1.32.1	255.255.255.0
Loopback3	10.1.33.1	255.255.255.0
Site-4
Eth0/0	172.16.7.2	255.255.255.0
Loopback1	10.1.41.1	255.255.255.0
Loopback2	10.1.42.1	255.255.255.0
Loopback3	10 . 1 . 43 . 1	255 . 255 . 255 . 00 < / tr >

On Site-x Routers

Configure and enable OSPF Area 0 on all interfaces with subnet IP address 10.1.0.0 and on Interface Eth0/0

Network type for Loopback interfaces on all routers should be point-to-point

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Configuration and Verification

Site-1

Now configure site-1 Router IP address 10.1.2.2 on interface e0/0 and configure three loopbacks as given below

enable

configure terminal

hostname Site-1

Interface E 0/0

ip address 10.1.2.2 255.255.255.0

no shutdown

exit

interface Loopback1

ip address 10.1.11.1 255.255.255.0

ip ospf network point-to-point

interface Loopback2

ip address 10.1.12.1 255.255.255.0

ip ospf network point-to-point

interface Loopback3

ip address 10.1.13.1 255.255.255.0

ip ospf network point-to-point

exit

router ospf 1

network 10.1.0.0 0.0.255.255 area 0

exit

write

Verification:- verify that interface ethernet0/0 is heaving ip address 10.1.2.2 and his status is UP now

Verify that three loopbacks are heaving ip address as per task and his status also UP.

Site-1#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Ethernet0/0 10.1.2.2 YES manual up up

Ethernet0/1 unassigned YES unset administratively down down

Ethernet0/2 unassigned YES unset administratively down down

Ethernet0/3 unassigned YES unset administratively down down

Loopback1 10.1.11.1 YES manual up up

Loopback2 10.1.12.1 YES manual up up

Loopback3 10.1.13.1 YES manual up up

Site-1#show ip ospf int br

Interface PID Area IP Address/Mask Cost State Nbrs F/C

Lo1 1 0 10.1.11.1/24 1 P2P 0/0

Lo2 1 0 10.1.12.1/24 1 P2P 0/0

Lo3 1 0 10.1.13.1/24 1 P2P 0/0

Et0/0 1 0 10.1.2.2/24 10 WAIT 0/0

Site-2 Now configures site-2 Router IP address 172.16.5.2 on interface e0/0 and configure three loopbacks as given below

enable

configure terminal

hostname Site-2

Interface E 0/0

ip address 172.16.5.2 255.255.255.0

no shutdown

exit

Interface Loopback1

ip address 10.1.21.1 255.255.255.0

ip ospf network point-to-point

Interface Loopback2

ip address 10.1.22.1 255.255.255.0

ip ospf network point-to-point

Interface Loopback3

ip address 10.1.23.1 255.255.255.0

ip ospf network point-to-point

exit

router ospf 1

network 172.16.5.2 0.0.0.0 area 0

network 10.1.0.0 0.0.255.255 area 0

exit

Verification:- verify that interface ethernet0/0 heaving ip address 172.16.5.2 and his status is UP now Verify that three loopbacks are heaving ip address as per task and his status also UP.

Site-2#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Ethernet0/0 172.16.5.2 YES manual up up

Ethernet0/1 unassigned YES unset administratively down down

Ethernet0/2 unassigned YES unset administratively down down

Ethernet0/3 unassigned YES unset administratively down down

Loopback1 10.1.21.1 YES manual up up

Loopback2 10.1.22.1 YES manual up up

Loopback3 10.1.23.1 YES manual up up

Site-2#show ip ospf interface brief

Interface PID Area IP Address/Mask Cost State Nbrs F/C

Lo1 1 0 10.1.21.1/24 1 P2P 0/0

Lo2 1 0 10.1.22.1/24 1 P2P 0/0

Lo3 1 0 10.1.23.1/24 1 P2P 0/0

Et0/0 1 0 172.16.5.2/24 10 BDR 1/1

Site-3 Now configures site-2 Router IP address 192.168.6.2 on interface e0/0 and configure three loopbacks as given below

enable

configure terminal

hostname Site-3

Interface E 0/0

ip address 192.168.6.2 255.255.255.0

no shutdown

exit

Interface Loopback1

ip address 10.1.31.1 255.255.255.0

ip ospf network point-to-point

Interface Loopback2

ip address 10.1.32.1 255.255.255.0

ip ospf network point-to-point

Interface Loopback3

ip address 10.1.33.1 255.255.255.0

ip ospf network point-to-point

exit

router ospf 1

network 192.168.0.0 0.0.255.255 area 0

network 10.1.0.0 0.0.0.255 area 0

exit

Now Verify that three loopbacks are heaving ip address as per task and his status also UP.

Site-3#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Ethernet0/0 192.168.6.2 YES manual up up

Ethernet0/1 unassigned YES unset administratively down down

Ethernet0/2 unassigned YES unset administratively down down

Ethernet0/3 unassigned YES unset administratively down down

Loopback1 10.1.31.1 YES manual up up

Loopback2 10.1.32.1 YES manual up up

Loopback3 10.1.33.1 YES manual up up

how ip ospf interface brief

Interface PID Area IP Address/Mask Cost State Nbrs F/C

Lo1 1 0 10.1.31.1/24 1 P2P 0/0

Lo2 1 0 10.1.32.1/24 1 P2P 0/0

Lo3 1 0 10.1.33.1/24 1 P2P 0/0

Et0/0 1 0 192.168.6.2/24 10 DR 0/0

Site-4 Now configures site-2 Router IP address 172.16.7.2 on interface e0/0 and configure three loopbacks as given below

enable

configure terminal

hostname Site-4

Interface E 0/0

ip address 172.16.7.2 255.255.255.0

no shutdown

exit

Interface Loopback1

ip address 10.1.41.1 255.255.255.0

ip ospf network point-to-point

Interface Loopback2

ip address 10.1.42.1 255.255.255.0

ip ospf network point-to-point

Interface Loopback3

ip address 10.1.43.1 255.255.255.0

ip ospf network point-to-point

exit

router ospf 1

network 172.16.7.2 0.0.0.0 area 0

network 10.1.0.0 0.0.255.255 area 0

exit

Verification:- verify that interface ethernet0/0 heaving ip address 172.16.7.2 and his status is UP now Verify that three loopbacks are heaving ip address as per task and his status also UP.

Site-4#show ip interface brief

Interface IP-Address OK? Method Status Protocol

Ethernet0/0 172.16.7.2 YES manual up up

Ethernet0/1 unassigned YES unset administratively down down

Ethernet0/2 unassigned YES unset administratively down down

Ethernet0/3 unassigned YES unset administratively down down

Loopback1 10.1.41.1 YES manual up up

Loopback2 10.1.42.1 YES manual up up

Loopback3 10.1.43.1 YES manual up up

Site-4#show ip ospf int brief

Interface PID Area IP Address/Mask Cost State Nbrs F/C

Lo1 1 0 10.1.41.1/24 1 P2P 0/0

Lo2 1 0 10.1.42.1/24 1 P2P 0/0

Lo3 1 0 10.1.43.1/24 1 P2P 0/0

Et0/0 1 0 172.16.7.2/24 10 WAIT 0/0

Conclusion:

Configuring OSPF between vEdges and site routers enables seamless integration of Cisco SD-WAN with existing network infrastructures. This dynamic routing setup ensures efficient route exchange, redundancy, and optimal path selection for enterprise connectivity.

To learn step-by-step implementation with real labs, enroll in our Cisco SD-WAN course with virtual lab at UniNets. This course covers routing protocols, control/data plane operations, and advanced SD-WAN deployment strategies. ideal for IT professionals aiming to master Cisco SD-WAN configuration and deployment.

Configuring Service VPN1, Interface & ...»

Deepak Sharma

He is a senior solution network architect and currently working with one of the largest financial company. He has an impressive academic and training background. He has completed his B.Tech and MBA, which makes him both technically and managerial proficient. He has also completed more than 450 online and offline training courses, both in India and ...

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