Hello, this is Bing, a senior network engineer for 20+ years, and I am happy to help you today.
I would like to first clarify how network topology is to be changed. Do you mean form:
this existing structure
Internet <-> Verizon Cable Modem <-> Computers
to something like this?
Internet <-> Verizon Cable Modem <-> Cisco RV320 <-> Computers
Yes, that's just something I am going to ask. :)
> Can't route traffic through the Cisco just yet. Existing Verizon Modem still working fine as I have one test
If the modem is not bridge mode, it should work as well, but this way your Cisco device won't get an public IP address and the whole network performance might be theoratically a bit slow as one more subnet and one more routing step between the Verizon and Cisco devices.
Please let me know your particular routing issue mentioned above.
What's your new finding?
I guess I know what is confusing you. The modem's bridge mode support multiple interfaces (rather than common one LAN port for most modems), you need to check Ethernet port for your scenario. STP is not necessary to be enabled. See below the screenshot for your reference.
Any update please?
Issue fixed? Please update. Thanks.