Stretching a network requires a vSphere enterprise plus edition.

Your vSphere vCenter must meet the following requirements to support Layer 2 extension.

Must have a vSphere Distributed Switch (vDS). The distributed switch is available with vSphere Enterprise Plus Edition.

When installed, the on-premises Layer 2 concentrator service appliance must have access to a vNIC port and any vLANs you want to stretch.

If you choose to stretch a network over the public Internet or your own VPN (on an alternate path), then the L2C virtual machine in your vCloud Air virtual data center also requires an IP address. You must know the remote IP address before you configure the Layer 2 concentrator. See Port Access Requirements.

If your architecture specifies multiple Layer 2 concentrators, each must have an IP address on-premises and in the cloud.