Long cable vs Router train
1 hour ago, Brian Blankenship said:by employing both a router and a switch you can let the router handle only the traffic it needs to, while the switches handle the inter-floor traffic with little-increased latency. The router will need to work less. Something I've noted using my routers as access points is that when I also make that do switching for devices local to them, they start getting much hotter. That's the CPU working harder. If the router only needs to handle the WiFi traffic it ends up performing much better. At least in my own experience.
if you have a router doing switching (defined as traffic going between devices connected to LAN ports) then only the switch chip, which can be outside of the CPU or integrated into the SoC, is doing more work - the CPU doesn't ever see purely switched traffic. It does cause heat in the switch chip, and in an SoC you could argue that the heat is in the "CPU area", but its not technically the CPU heating itself up for switched traffic. However if you mean bridging, where you are using the WAN port as part of the LAN set (as is commonly available with routers that have a builtin AP mode) then yes the bridged traffic gets processed by the OS on the CPU and would cause load/heat. So I would recommend that you not use the WAN/uplink port on routers that are in AP mode (use the LAN ports only). The only exception is routers like those made by Mikrotik, where instead of 2 hard connections on the CPU to the WAN and LAN, they can actually reassign the WAN port to be part of the switched ports on the switch chip when you aren't using them for NAT/Firewall.
For @kurtwism's case, I think using the routers as they already exist / are set up is fine, they are already doing much less work in the AP role than they would be as routers, regardless of whether the WAN/uplink port is being used or not.
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