How to tell whether device has network switch ports (DSA vs swconfig)?

A few rules of thumb:

  • Prosumer or consumer x86/x86_64 systems with a built-in switch are pretty much non-existent. Almost all of them use separate NICs (Realtek, Intel, sometimes Atheros NICs).
  • Most dedicated consumer network hardware relies on SoCs with built-in switches.
  • Even access points etc. with a single physical network port often have a switch inside (part of the SoC).
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