VRRP configuration (RUTX09)

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Introduction[edit | edit source]

The Virtual Router Redundancy Protocol (VRRP) is a computer networking protocol used for automatic default gateway selection for clients on a LAN network in case the main router (Master) becomes unavailable. Another VRRP router (Backup) then assumes the role of Master; thus backing up the connection.

This page contains a guide on how to configure VRRP on RUTX09 routers. To see the manual page for VRRP, click here.

Configuration overview[edit | edit source]

You will need


Topology

Networking rutx configuration examples vrrp configuration scheme 1 v2.png


Explanation The routers and the PC are connected to the same network (192.168.1.0/24 via a switch. The purpose of the system is to provide an Internet connection for the PC via the the MASTER (RUTX1) router and backup that connection via the BACKUP (RUTX2) router in case the MASTER fails.

Below is alternate topology that does not contain a switch. The configuration is identical for both cases. However, while the topology above provides a connection backup in case of any type of failure, the topology below will only backup the connection if the MASTER router loses its connection but remains available inside the network (i.e., it will not backup the connection if the MASTER is, for example, powered off).


Alternate topology

Networking rutx configuration examples vrrp configuration scheme 2 v3.png

Configuration[edit | edit source]

Routers[edit | edit source]


This section provides the configuration parameters used for the MASTER and BACKUP routers. The table below is contains a summary of the settings used. As you can see the configurations are identical with the exception of the Priority parameter.

Field MASTER router BACKUP router
Virtual ID 1 1
Priority 255 100
Interface LAN LAN
IP address 192.168.1.253 192.168.1.253


The figure below is a screenshot of the VRRP configuration page for the MASTER router:

Networking rutx configuration examples vrrp configuration router configuration v2.png


For detailed information on the purpose of each field, refer the VRRP manual page.

PC[edit | edit source]


Now you will need to set up a static IP address configuration on your PC. For this example we will be using the following parameters:

IPv4 address: 192.168.1.3
Netmask: 255.255.255.0
Gateway: 192.168.1.253

If you are unsure of how to set up a static IP, please refer to one of our guides:

Testing and troubleshooting[edit | edit source]

To test whether the configuration works, terminate the MASTER router's Internet connection (e.g., unplug the cable, remove the SIM card). If everything is okay, the PC should regain its connection to the Internet shortly after that.

Restore the Internet connection to the MASTER router .

See also[edit | edit source]