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OSPF Route Failover New

Revision as of 15:22, 8 August 2024 by Eimantas.Naikelis (talk | contribs) (→‎Network Topology)

Summary

The information in this page is updated in accordance with the RUTXXX_R_00.07.08.1 firmware version.

In this example we will setup redundant links using dynamic routing where 2 routers will be connected using multiple links directly – Main WAN and two Backup WANs in order to make sure LAN devices on each end would be available in case Main links fail.

Configuration Overview & Prerequisites

For this example, we will need two routers with 3 separate WAN interfaces. It can either be Wired links or Private Mobile networks. In this example we will use 3 wired links for the simplicity of testing. However, there can be other variations, such as 1 Wired link and 2 Mobile links.

Each WAN on both ends has to be in the same private network. In other words:

  • RUT1 WAN1 interface must be able to reach RUT2 WAN1 interface;
  • RUT1 WAN2 interface must be able to reach RUT2 WAN2 interface;
  • RUT1 WAN3 interface must be able to reach RUT2 WAN3 interface.

Network Topology

OSPF WAN TOPOLOGY.png

Router 1 Configuration

LAN as WAN Configuration

VLAN Configurtion

Open router‘s WebUI and navigate to Network → VLAN → Port Based configuration:

Port based VLAN

Add new VLANs by clicking Add Button.png and Make following changes to 3 new VLANS:

  1. VLAN ID: 192 | lan1: Untagged | Lan2: Off | Lan3: Off
  2. VLAN ID: 10 | lan1: Off | Lan2: Untagged | Lan3: Off
  3. VLAN ID: 172 | lan1: Off | Lan2: Off | Lan3: Untagged

OSPF WAN 1.png

WAN Interface Configurtion

Open router‘s WebUI and navigate to Network → WAN → WAN interfaces configuration:

Creating And Configuring WAN 1 Interface

Add new WAN by clicking Add Button.png and Make following changes to new interface configurtion:

General Settings

Make the following changes:

  1. Enter Name: Wan1Main
  2. Select Protocol: Static
  3. Enter IPv4 address: 192.168.110.1
  4. Enter IPv4 net mask: 255.255.255.252
OSPF ROUTER1 WAN1 General.png
Physical Settings

Make the following changes:

  1. Select interface: eth0.192
OSPF ROUTER2 WAN1 Physical.png


Creating And Configuring WAN 2 Interface

Add new WAN by clicking Add Button.png and Make following changes to new interface configurtion:

General Settings

Make the following changes:

  1. Enter Name: Wan2Backup
  2. Select Protocol: Static
  3. Enter IPv4 address: 10.0.110.1
  4. Enter IPv4 net mask: 255.255.255.252
OSPF ROUTER1 WAN2 General.png
Physical Settings

Make the following changes:

  1. Select interface: eth0.10
OSPF ROUTER2 WAN2 Physical.png
Creating And Configuring WAN 3 Interface

Add new WAN by clicking Add Button.png and Make following changes to new interface configurtion:

General Settings

Make the following changes:

  1. Enter Name: Wan3Backup
  2. Select Protocol: Static
  3. Enter IPv4 address: 172.16.110.1
  4. Enter IPv4 net mask: 255.255.255.252
OSPF ROUTER1 WAN3 General.png
Physical Settings

Make the following changes:

  1. Select interface: eth0.172
OSPF ROUTER2 WAN3 Physical.png

OSPF Configuration

Open router‘s WebUI and navigate to Network → Routing → Dynamic routes → OSPF configuration:

OSPF - Global Settings

Make following changes:

  1. Enable Service: on
  2. Enable Vty: on
  3. Enter Router ID: 192.168.110.1
  4. Select External Route: Default
  5. Select Redistribution Options: Connected
OSPF GLOBAL ROUTER1.png
OSPF interfaces

Add new OSPF interface for each WAN interface created by clicking Add Button.png

Make following changes to new interfaces:

  1. Select Interface: eth0.192 (WanMAIN) | Enable Interface: on
  2. Select Interface: eth0.10 (Wan2Backup) | Enable Interface: on
  3. Select Interface: eth0.172 (Wan3Backup) | Enable Interface: on
OSPF INTERFACES 1.png
OSPF area

Add new OSPF area for each WAN interface by entering the area name and clicking Add Button.png

Make following changes to the areas:

  1. Name: First | Area: 1005 | Stub: off | on
  2. Name: Second | Area: 1004 | Stub: off | on
  3. Name: Third | Area: 1003 | Stub: off | on
OSPF AREA 1.png
OSPF networks

Add new OSPF network for each WAN interface by entering the area name and clicking Add Button.png

Make following changes to the netwroks:

  1. Name: WAN1 | Network: 192.168.110.0/30 | Area: First | on
  2. Name: WAN2 | Network: 10.0.110.0/30 | Area: Second | on
  3. Name: WAN3 | Netwrok: 172.16.110.0/30 | Area: Third | on
OSPF NETWORKS 1.png

Router 2 Configuration

LAN as WAN Configuration

VLAN Configurtion

Open router‘s WebUI and navigate to Network → VLAN → Port Based configuration:

Port based VLAN

Add new VLANs by clicking Add Button.png and Make following changes to 3 new VLANS:

  1. VLAN ID: 192 | lan1: Untagged | Lan2: Off | Lan3: Off
  2. VLAN ID: 10 | lan1: Off | Lan2: Untagged | Lan3: Off
  3. VLAN ID: 172 | lan1: Off | Lan2: Off | Lan3: Untagged

OSPF WAN 1.png

WAN Interface Configurtion

Open router‘s WebUI and navigate to Network → WAN → WAN interfaces configuration:

Creating And Configuring WAN 1 Interface

Add new WAN by clicking Add Button.png and Make following changes to new interface configurtion:

General Settings

Make the following changes:

  1. Enter Name: Wan1Main
  2. Select Protocol: Static
  3. Enter IPv4 address: 192.168.110.2
  4. Enter IPv4 net mask: 255.255.255.252
OSPF ROUTER2 WAN1 General.png
Physical Settings

Make the following changes:

  1. Select interface: eth0.192
OSPF ROUTER2 WAN1 Physical.png


Creating And Configuring WAN 2 Interface

Add new WAN by clicking Add Button.png and Make following changes to new interface configurtion:

General Settings

Make the following changes:

  1. Enter Name: Wan2Backup
  2. Select Protocol: Static
  3. Enter IPv4 address: 10.0.110.2
  4. Enter IPv4 net mask: 255.255.255.252
OSPF ROUTER2 WAN2 General.png
Physical Settings

Make the following changes:

  1. Select interface: eth0.10
OSPF ROUTER2 WAN2 Physical.png
Creating And Configuring WAN 3 Interface

Add new WAN by clicking Add Button.png and Make following changes to new interface configurtion:

General Settings

Make the following changes:

  1. Enter Name: Wan3Backup
  2. Select Protocol: Static
  3. Enter IPv4 address: 172.16.110.2
  4. Enter IPv4 net mask: 255.255.255.252
OSPF ROUTER2 WAN3 General.png
Physical Settings

Make the following changes:

  1. Select interface: eth0.172
OSPF ROUTER2 WAN3 Physical.png

OSPF Configuration

Open router‘s WebUI and navigate to Network → Routing → Dynamic routes → OSPF configuration:

OSPF - Global Settings

Make following changes:

  1. Enable Service: on
  2. Enable Vty: on
  3. Enter Router ID: 192.168.110.2
  4. Select External Route: Default
  5. Select Redistribution Options: Connected
OSPF GLOBAL ROUTER2.png
OSPF interfaces

Add new OSPF interface for each WAN interface created by clicking Add Button.png

Make following changes to new interfaces:

  1. Select Interface: eth0.192 (WanMAIN) | Enable Interface: on
  2. Select Interface: eth0.10 (Wan2Backup) | Enable Interface: on
  3. Select Interface: eth0.172 (Wan3Backup) | Enable Interface: on
OSPF INTERFACES 1.png
OSPF area

Add new OSPF area for each WAN interface by entering the area name and clicking Add Button.png

Make following changes to the areas:

  1. Name: First | Area: 1005 | Stub: off | on
  2. Name: Second | Area: 1004 | Stub: off | on
  3. Name: Third | Area: 1003 | Stub: off | on
OSPF AREA 1.png
OSPF networks

Add new OSPF network for each WAN interface by entering the area name and clicking Add Button.png

Make following changes to the networks:

  1. Name: WAN1 | Network: 192.168.110.0/30 | Area: First | on
  2. Name: WAN2 | Network: 10.0.110.0/30 | Area: Second | on
  3. Name: WAN3 | Netwrok: 172.16.110.0/30 | Area: Third | on
OSPF NETWORKS 1.png

Testing Configuration

If everything was set up correctly, we should see routes to the second network through the main link in the routing table:

OSPF Route failover routing table main v1.png

Let us simulate Main link failure by disconnecting the cable and see how that affects routes to the second network:

OSPF Route failover routing table backup v1.png

As we can see, dynamic routing automatically switched to the next available route.

Testing communication between LAN devices

Let us connect a LAN device to each of the routers and see if they can communicate with each other, for this example, we will connect laptop to the first router and another laptop to the second router:

  • Laptop 1 IP: 192.168.1.220
  • Laptop 2 IP: 192.168.2.5

Let us run a ping command from the first laptop to the second and disconnect the Main link cable midway through:

OSPF Route failover ping testing v1.png


We can see that after a short delay, laptop on the second router continued communication, which means dynamic routes are being set correctly.

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