Basic network switch redundancy question in multi-WAN pfSense context

  • It is a common setup for multi-WAN pf setup that a single NIC is used for WAN side with a VLAN switch, with one VLAN configured for each of the WANs. Now, that VLAN switch becomes a potential single-point-of-failure.

    What's the very basic way to use two physical switches for this purpose to ensure redundancy? Spanning Tree Protocol and/or LAGG (each link from pf WAN NIC going to each of the switches)?

    The same question applies for LAN-side, too.

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