OSPF Route Failover New

From Teltonika Networks Wiki

Summary

The information in this page is updated in accordance with the RUTXXX_R_00_07_02 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

Router1 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 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

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 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
Physical Settings

Make the following changes:

  1. Select interface: eth0.192


Creating And Configuring WAN 2 Interface

Add new WAN by clicking 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
Physical Settings

Make the following changes:

  1. Select interface: eth0.10
Creating And Configuring WAN 3 Interface

Add new WAN by clicking 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
Physical Settings

Make the following changes:

  1. Select interface: eth0.172

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 interfaces

Add new OSPF interface for each WAN interface created by clicking

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 area

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

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 networks

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

Make following changes to the areas:

  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

Router2 Configuration

LAN as WAN Configuration

OSPF Configuration





We will not go too deep into basics. Assuming we already have VLANs set up to have three different links between routers according to the topology, we can jump straight into configuring dynamic routes using OSPF.

OSPF can be configured in WebUI, by navigating to Network → Routing → Dynamic Routing → OSPF.

Note: if dynamic routing is not available in WebUI, you can install an additional package by navigating to Services → Package Manager.

OSPF - General settings

  1. Enable Service
  2. Enable vty
  3. Set Router ID (Can be set to any number or IP address)
  4. Set "Generate a default" external route as Default
  5. Select Connected in "Redistribution options"

OSPF Interface settings

  1. Add 3 new interfaces for wan, WAN2 and WAN3
  2. (Optional) Set interface priorities and custom dead times
  3. Leave other settings as default

OSPF Area settings

  1. Create 3 new instances with different Area codes and enable them:
    1. 1005
    2. 1004
    3. 1003

OSPF Networks settings

  1. Add new instance, Network: 192.168.110.0/24; Assign first area
  2. Add new instance, Network: 10.0.110.0/24; Assign second area
  3. Add new instance, Network: 172.16.110.0/24; Assign third area

Second router

Second router should be configured analogously as the first router.

OSPF will now set routes dynamically depending on availability of the connected links, therefore if Main link fails, traffic will route through a backup link.

Testing Configuration

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

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

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:


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

See Also

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