Extending the ports of a router is the most common usecase for a managed switch at a funkfeuer node. A router (e.g. EdgeRouter) is connected to one port of the switch and can access other ports of the switch separately. This is done via VLANs: the router is on a trunk port, other (wireless) devices are on access ports. See the RouterOS Documentation on Bridge VLAN Tables for further explanation. First it is advisable to create a VLAN table in the documentation(!) of your node (e.g. a wiki page).