Mavericks 10.9.1/iMac Mid 2011/VLAN problem

Hello all,
I have this problem since Mavericks migration.
My iMac network interface is directly connected to a switch using a custom VLAN on the switch side (id 4). DHCP Client is selected and a DHCP server is ready and working to deliver the right adress, but the iMac interface never lights up. VLAN is not configured on the client side (no virtual interface, just using standard Ethernet interface and DHCP setting). This configuration has never been working on Mavericks, but used to work perfectly on ML.
To make my iMac interface work, I have to be connected to the switch using the default VLAN (id 1). However, as my secondary VLAN works using id 4, I should then remap any switch interface to id 1 and then activate a virtual interface using id 4 on any iMac computer... which works, but which is also something I don't want to do, because it would involve too much work on the network side.
Am I facing a bug, or is there a deep change on Mavericks' network pile, which would involve using only a default vlan ?
Many thanks for help or suggestions.

Hello,
Interesting information : I couldn't reproduce this strange behaviour on a 2012 MacBook Pro. Regarding VLANs, everything works fine and as expected on this plateform. Still buggy for iMac 2011, though...
Many thanks for help or suggestions.

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