I believe what I am about to ask is on-topic. I have Cisco DPC3828S (wireless router/modem) from ISP, which I cannot turn into bridge. So, it does routing.
I have layer 3 switch, Cisco SG350-10. Rather than letting the DPC3828S to do routing for all the connected devices, I am planning to let the layer 3 switch to handle every routing instead, as, I believe, DPC3828S cannot handle many devices and would be slow if many devices are connected...(about 20-30 devices will be connected in the network). I am right or wrong?
Opt 1: DPC3828S and switch (SG350) will have different subnets. SG350 will run DHCP. So, the SG350 will be acting like the main router.
Opt 2: Let DPC3828S to be the main router and just use SG350 as normal switch.
I believe opt 1 should be better because DPC3828S works lesser. Since I am a newbie to layer 3 switch, can someone please give me hint of what is the best practice for this setup? Should I make a vlan for the network (I only need 1 network tho)? Or is there better way to make L3 switch to do routing? I would prefer performance or speed than security. Thank you.
EDIT: I have tried to configure the L3 switch. To be able to connect the modem/router network with the L3 new network for other devices, I would need to make 2 VLANs in L3 switch, right? 1 that match the modem/router network and 1 with DHCP.