Introduction

For businesses in particular, the high availability of data connections presents an essential requirement of the network components. The devices provide various mechanisms for securing data transfer as a backup solution:

• Various WAN interfaces (DSL, Fiber, 4G/5G) enable data transfer over a second physical medium if the primary WAN interface is disturbed or fails.
• In order to provide protection from failure of an Internet provider's network, different Internet access accounts can be configured with Multi-PPoE.
• Two or more VPN gateways in a network can share the VPN tunnels required, thus keeping data traffic alive even in cases of temporary failure of a VPN end point.
• VRRP can now also be used to implement a sophisticated backup system for protection against router hardware failure. Two or more routers are installed in a network, one of which can replace the other in case of device failure.
• In addition to the normal VRRP, the triggering of the backup event can be linked to the availability of a data connection. With this additional feature, devices with more than one WAN interface (e.g. two DSL interfaces) can be implemented flexibly into backup solutions. The backup event is triggered, for example, when the default route is no longer available via the first DSL interface. The device's second DSL interface can take its place further along in the backup chain should the the backup router also fail. However, the 5G interface of the device can take up another place in the backup chain if the backup router is also disrupted.