The office is divided into several VLANs, all devices converge on the central switch, two Mikrotik routers, primary and backup, are connected to the same switch, both are used to route traffic between VLANs and distribute addresses over VLANs, etc. In a normal situation, the main router communicates with the switch, the backup works at the same time, but the link to the switch is turned off. On both routers, all settings are the same (except for the external address). on the backup router, when the Internet appears or when the main router is restored, the switch should switch back to it. How is this better implemented? I still have a script with a switch on the switch that will check the connection with the main router and when the link disappears use a link with a backup router. At the moment, the central switch is level 2, it is possible to switch to a switch at level 3. I attach the scheme.