I'm having such configuration:
Primary router is rb4011igs+5hacq2hnd-in, second router is hEX PoE RB960PGS to control 3 repeaters cAP lite (RBcAPL-2nD). I have 250Mbs WAN connected to Eth1 to primary router and LTE modem as USB stick LTE HUAWEI E3372h connected to secondary router. They are powered by Back-UPS when electricity is off.
Please help me with configuration - how can I handle failover - when primary WAN is out (or when equipment is on Back-UPS so no WAN at all) I can use internet from LTE?
I've seen a number of scripts to handle such case when 1-2-3 WANs and/or LTE connected to router but no cases when there are two or more routers and each has its own WAN to handle failover from each others.
Any help appreciate!