The edge gateways in a vCloud Director environment support L2 VPN. With L2 VPN, you can extend your organization virtual data center by enabling virtual machines to maintain network connectivity while retaining the same IP address across geographical boundaries. You can configure the L2 VPN service on an edge gateway.
NSX Data Center for vSphere provides the L2 VPN capabilities of an edge gateway. With L2 VPN, you can configure a tunnel between two sites. Virtual machines remain on the same subnet despite being moved between these sites, which enables you to extend your organization virtual data center by stretching its network using L2 VPN. An edge gateway at one site can provide all services to virtual machines on the other site.
To create the L2 VPN tunnel, you configure an L2 VPN server and L2 VPN client. As described in the NSX Administration Guide, the L2 VPN server is the destination edge gateway and the L2 VPN client is the source edge gateway. After configuring the L2 VPN settings on each edge gateway, you must then enable the L2 VPN service on both the server and the client.