I'm trying to get to the bottom of why I only get 100mb/s rather than 1Gbp/s speed on my LAN (internet is running fine at 250mb/s) using my C1200, and I wanting to check the negotiation speed settings for the ports as part of this.

I'm finding lots of references to the instruction to go to Basic->Network Map->click on the Icon for TP-Link router in the web interface for the router. However this does not display anything other than wifi network info.

Here's what I see when I follow the instructions.

It feels like I'm missing something obvious, so if anyone can tell me what that is, it would be appreciated.

One possibly minor thing that I don't know if it's related or not, is that the images in the instructions of the web interface, shows the router icon with the model in text beneath it, whereas mine just has "Router". Maybe it's just something that support for which is only on some models.