More comments: In 3.4.2: In this case, the VID used by the VM has a global significance. Various rules and usage range of the VID are required to be provided. The VLAN-ID used by a given VM is referred to the VLAN-ID carried by the traffic that is originated by that VM and within the same L2 physical domain as the VM.
The VID used doesn't need to have global significance. It can be inserted by the virtual switch (in the hypervisor or NIC on the end system) and have been assigned to map to the VNI on the OBP in the ToR. In that case, it is stripped when the OBP does the encapsulation and doesn't go end to end. In IEEE 802.1Qbg, we use that approach to map a VID to an I-CID on the a Provider Edge Bridge (e.g. at the ToR). VDP provides the communication between the End System and the Bridge so that the Bridge can assign the locally significant VID to map to the I-CID and so that the End System can signal that migration is occurring.
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