> I don't agree that it always appears as a NIC.  It appears as some
> sort of protocol interface, but that is not necessarily a NIC to the
> tenant system.   For example, in the physical world, a VLAN doesn't
> look like a NIC to the host OS.

In Linux at least a VLAN does look like a NIC (interface) on the
TS. You first configure the interface, then to use a VLAN, you end up
creating a virtual interface (for that VLAN) that connects through the
other interface. To the linux host, each VLAN appears as its own
interface.

See the "vconfig" command for instance on how this works.

But in any case, I think the broader point stands that a TSI is the
hypervisor-facing side, whereas on the TS, you get an interface of
some sort. The exact details of how that interface is presented depend
on the TS (whether linux, microsoft, etc.) itself. But that is the
case whether the interface is physical or virtual.

Thomas

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