Author: Antxon Gonzalez
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The physical network interfaces belong to a network service type (NST), which identifies the network segment that the interface is connected to.
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Before you add a physical machine to a datacenter, you need to create the rack it will belong to.
A rack is a logical set of physical machines providing the same level of compute service.
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Network service type
Every time you add a physical machine, you must choose its rack and specify the network service type (NST) its network interfaces are connected to.
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There are three different kind of networks:
Private: Bound to the virtual datacenter (VDC) they were created in.
The network tag is taken from the network tag pool of a rack automatically, bounding the network workload to it.External: Bound to a datacenter and a cloud tenant (enterprise).
This means that the network VLAN tag has the same meaning for all racks in the datacenter.Public: Bound to a datacenter only.
They are similar to external networks, but more than one enterprise may use them.
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