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Imagine the following scenario:

    Primary Switch
    (VLAN 3 Port)
   Unmanaged Switch
  (Dedicated to IPMI
         / \
        /   \
Server 1    Server 2
 (IPMI)      (iDRAC)

Would the clients on the unmanaged switch automatically become part of VLAN 3 when trying to communicate the the rest of the network?

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up vote 8 down vote accepted

Yes. Assuming that the unmanaged switch is just a dumb L2 device, it will be on the same L2 domain as everything else on VLAN 3.

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Yes, as long as you aren't tagging traffic through that port, it is just a dumb L2 switch.

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