Hi, Thanks for your suggestion, I have configured it as:   On the MX64 I have a LAN port with: Native VLAN1 (default) Allowed VLANs: 1,2,20,30,40 On the D-Link port at the other end of the cable I have: Tagged VLANs: 2,20,30,40 Untagged VLANs: 1 PVID: 1 Is this correct? ... View more

Thanks for all the comments. Any thoughts on using a dumb switch between the MX64 and the TP-Links?  ... View more

Yes, this does seem to solve the problem. Thank you.   ... View more