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How VLANs work at a high level, the system requirements, how to configure VLAN support, and an example of how you can use VLAN tagging between hosts for quick isolated subnet tests.
Windows Server 2008 Hyper-V provides support for using Virtual LANs (VLANs) on the parent and child partitions (host and virtual machines). This article explains how VLANs work at a high level, system requirements for the infrastructure to support VLAN tagged packets, how to configure VLAN support for the parent and child partitions, and an example of how you can use VLAN tagging between hosts for quick isolated subnet tests.
The IEEE 802.1Q standard for VLAN tagging was created to simply allow you to take a physical network connection and transmit multiple streams of network traffic. Each stream is virtually isolated from each other so that a machine on VLAN1 and a machine on VLAN2 cannot see each other’s packets unless there is a router connected to both VLANs and is performing routing between the VLANs. The diagram on the left below shows that a single physical network cable can have multiple VLANs flowing through it as well as non-VLAN traffic, this is referred to as “trunking”. While the diagram on the left is the conceptual view of the traffic isolation, the diagram on the right shows that the packets are part of a stream and that only the computer that is part of the same VLAN can see the packets on that VLAN and that a computer without a VLAN ID cannot see any packets that are part of a VLAN.
Figure 1
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