With the announcement of ESX Server 3.0 and VirtualCenter 2.0 (aka Virtual Infrastructure 3.0) VMware launched a series of whitepapers to clarify technical and marketing aspects of the new offering.
The fifth one of the series:
This white paper provides an overview of VLAN concepts and benefits and illustrates three possible ESX Server and virtual machine VLAN configurations. It then compares the advantages and disadvantages of the three possible configurations and recommends some best practices.
The paper also includes configuration samples for both ESX Server and the external physical switches and concludes with a list of frequently asked questions.
Read it here.