I am testing a Cisco RV340 small business router/firewall with my iMac Pro and have found that it does not do proper port negotiation. I am limited to 100 Mbps (here on port 4): I know that the cat 7 cable and and port work just fine as: 1. I get the ~1000Mbps supported by my Xfinity modem when connected directly to a 10 Gbps switch 2. I have seen over 1 Gbps when doing file transfers over the network 3. Switching the devices on ports 1 & 4 also switches the negotiated speed rates I have tried manually changing the port specifications in Network Preferences/Advanced/Hardware but it makes no difference. Cisco is working the issue but I wanted to see if there is anything else I could do on the iMac end.