VLAN split through 2 Netgear Switches (GS72TP, XS708T) doesn’t work.

Question

I thought I finally understood VLANs until I got stuck to this problem.&nbsp;I have two Netgear Switches. A GS72TP and a 10Gb XS708T. They are routed by an UDM-PRO.&nbsp;&nbsp;I have successfully set a few VLANs with this equipment, except for one (VLAN 25), which splits across the two switches.&nbsp;The UDM-PRO sees and assigns IPs to all the VLAN 25.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The first 5 devices are physically on the GS72TP. &nbsp;The last one (.231) on the XS708T.The devices on the GS ping to each other no problem, but they do not see the one on the XS (and viceversa).&nbsp;This is the default VLAN membership for the XS:PORT 7 and 8 are Trunk connections to the UDM-PRO and GS switch, respectively.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This is the VLAN 25 membership for the XS:PORT 1 and 6 are VLAN 25 members. PORT 7 and 8 are Trunk connections to the UDM-PRO and to the GS switch, respectively.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Here are the PVID configurations for the XS:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;And this are the VLANs membership settings on the GS.Default VLAN first (see below). The PORTS 23 and 24 are Trunks to the Router and the XS switch, so I thought they should be Tagged… but the GS won’t let me change the default VLAN membership.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;and VLAN 25:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PVID configurations on the GS:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I’m sure I made an obvious mistake somewhere… this is not my field and I’m literally losing sleep over this problem, so any insight is very welcome!&nbsp;-Alessandro&nbsp;&nbsp;

presi · Accepted Answer

I ended up doing some test... Now I actually believe the problem was with the Copper/SFP+ combo port on the XS708T. For some reason, the VLAN seems not to work when I use the SFP+ wiring instead of the copper.

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VLAN split through 2 Netgear Switches (GS72TP, XS708T) doesn’t work.

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