All Simrad/B&G/Lowrance ethernet is standard Ethernet with a different connector.
You can run most routers and switches using a "converter cable" or put a RJ45 on one of the Navico cables
Some time ago it could be an issue if the Simrad/B&G main device (plotter) did not issue the IP addresses but I think that has been fixed later so you can run your own main router without issues.
The one thing that can be an issue with 3rd party ethernet switches and routers is many are very "open" to ingest noise
transmitters. So you could see network dropouts when transmitting on VHF
transmitting. Most people might not notice but TX/RX Ethernet errors would climb in the B&G
status page. The B&G
external WiFi IF have VHF noise
filter built in. TX/RX errors can impact radar images
or sonar images
OneNet is FINALLY on its way after 8-10 years of NMEA
procrastinating - Ethernet Boating
will become more "normal" and devices with good noise suppression and POE (Power Over Ethernet) will become readily available.