¿ VLAN Path between Cablemodem (Unitymedia Connect Box) and Router (Fritz! Box 7590) ?

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_Karl_ wrote:

Is a VLAN path in between the connection of "FritzBox7590" and "Connect Box in bridge mode" possible and if so: how?
My preliminary attempt with only one Smart Switch (GS108Tv3) and a VLAN set up there (one VLAN ID for the administration branch of the GS108Tv3, another VLAN ID for those 2 ports of the connection between the cable modem and FritzBox) through which the packets should run between FritzBox and cable modem failed, but why. 

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Still digging in the dark, leaving alone where and how ths devices mentioned are conneced to a fiber.

Trying to sketch a picture here. 

If you intend to run multiple networks over this fiber connection (wild guess some copper<->fiber converters are in the game), the fiber has to carry two networks in the from of two VLANs (so called a trunk), where either both VLANs are tagged, or one is untagged, and the other one is tagged. Guessing again this is currently done by this single GS108Tv3.For the "WAN" connection path, two ports configured like  VLAN A untagged/PVID A, optional one for the management network VLAN B/PVID B if desired.

Now on the other side of this fiber link (or copper after another converter), the trunk must be "split" for the two networks again. So here anther switch is required. On one hand a port configured as the trunk (similar to the other end), and one port for each network (like one for VLAN A untagged/PVID A, and one for VLAN B/PVID B)