This is basically just using a core switch and keeping your router as your edge of network.
I’d go even further and buy a layer 3 lite switch as that core and have your gateway address on endpoints be that switch IP. Have some routing to point 0.0.0.0/0 on your switch to your router IP.
Move DHCP and DNS roles onto a server and disable them on your router.
With that set up, it means you can swap out your edge of network without disrupting your internal traffic.
This is basically just using a core switch and keeping your router as your edge of network.
I’d go even further and buy a layer 3 lite switch as that core and have your gateway address on endpoints be that switch IP. Have some routing to point 0.0.0.0/0 on your switch to your router IP.
Move DHCP and DNS roles onto a server and disable them on your router.
With that set up, it means you can swap out your edge of network without disrupting your internal traffic.