Possibly the most important application of VRRP is the provision of backup connections in which one or more routers serve as backup for the main router. These routers can use different physical media for the Internet connection, such as DSL in the main router and DSL or 5G in the backup routers. A normal backup chain thus resembles the following:
- If the Fiber connection fails 1, the DSL router 2 takes over the function.
- If the DSL connection 2 fails, the 5G router 3 takes over the function.
On R&S®NC devices with multiple WAN interfaces, the primary router can also assume a backup role at the end of the backup chain, as long as there is no complete hardware failure.
