Hi @Philippe. The topology page is populated using LLDP and CDP inputs received on Meraki switches.
If you're not seeing the catalyst switch, I'd first double-check that CDP is enabled on it's connected interface. If it is, it might be worth giving Meraki Support a call to see if they have any additional compatibility insight.
I'm not sure that the SG100 series support CDP/LLDP. So they probably won't show up on the diagram. I like the Meraki generated diagram for a quick look but we still heavily label our ports and maintain our own diagram.
Adam R MS | CISSP, CISM, VCP, MCITP, CCNP, ITILv3, CMNO If this was helpful click the Kudo button below If my reply solved your issue, please mark it as a solution.