This is the scenario.
I have an MX84 which ports 1 and 2 will act as primary and secondary internet links (WAN 1 and WAN 2). However, since internet links will not be installed by the commissioning day I have been planning to get a 4G temporary router plugged to port 3 in the MX and somehow get it configured as a second internet backup link (WAN 3) in case the 2 internet links fail.
Is it possible? Can anyone guide me through a similar solution?
Thank you very much in advance.
I have not tried this but you could give it a go. 4G Router plugs into Ethernet port and add a static route to that hop on addressing & VLANS > Add Static Route
@PhilipDAth has a great point, use one of the WAN ports if you can. If not I would get a new modem for your 3G/4G line of service and utilize the USB port.