SG-2220 - VLANs on the WAN side?
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I got SG-2220, which only has two ports - LAN and WAN. I want to create connectivity redundancy by adding a mobile hotspot as emergency fail-over option. Since there is only one WAN port, can I get VLAN capable switch (like edgerouter lite, etc) and run cable modem and mobile hotspot into it, then connect one port to pfSense WAN port?
I could setup VLANs on the router, and add corresponding VLANs on PfSense. Does this setup make sense? Would it work?
Yes. You can have VLANs on WAN going to an outside switch to two or more different providers.
pfSense: vlan 100 vlan 101
Switch: tagged port vlans 100 and 101 to pfsense, untagged 100 to ISP 1 modem, untagged 101 port to ISP 2 modem.
It will be functionally equivalent to having two different WAN interfaces.
You will have to understand that powering off and on one of the modems won't trigger a DHCP renewal event on pfSense because the port will not go down from its perspective. You might have to release renew manually, etc, if that ever arises.