Internal (virtual) switch

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Hello,
in our setup every virtual nic is associated with an corresponding physical interface with vlan tags on it.
Is it possible, like openvswitch, to create virtual network-switches, which can be mapped to an virtual network card?

Our network needed physical outputs in the past, but now, some virtual servers in different security zones should only communicate with each other - without the need of map these ports to physical ones because they are all virtual.

Thanks & hope this is possible (like in vmware),
Karsten