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vSphere VLAN: Understanding 802.1Q VLAN tagging
This article is part of the Network Evolution issue of June 2011 Vol. 2, No. 3
Configuring vSphere VLANs can be more complicated than establishing VLANs in a typical physical network and therefore requires a different approach – 802.1Q VLAN tagging. In a physical network, servers all have their own physical Network Interface Cards (NICs) that are connected to a physical switch port. As a result, VLANs are usually controlled by setting the VLAN ID on the physical switch port and then setting the server's IP address to correspond to that NIC's VLAN. But in a virtual environment, dedicating a physical NIC (pNIC) to each VM that resides on the host doesn't work. In fact, a host physical NIC may service many VMs, which may all need to be connected to different VLANs. Consequently, the old method of setting a VLAN ID on the physical switch port doesn't work. That's where 802.1Q VLAN tagging comes in. VLANs primer VLANs for networking professionals: In this guide learn everything from basic VLAN configuration to setting up VLANs in virtual environments. Networking for virtualization: The basics Before we ...
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vSphere VLANs have requirements different from those of VLANs in physical environments because VMs are fluid and can't be assigned to one physical NIC. So 802.1Q VLAN tagging offers a new approach to configuring and managing VLANs in vSphere.
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