VXLANs are great, but they don't work out of the box. In the following sections, we discuss how to set them up.
As you already have vCloud set up, you must have a vCloud Network and Security appliance (vCNS) deployed (formally known as vShield), and it should be configured to use your vCenter. For this recipe, you will need to be able to log in to the vCNS appliance with an administrator account.
Additionally, we need a VLAN on which the VXLANs will exist, and having a DHCP in that VLAN makes things easier. If no DHCP is accessible on this VLAN, you will need to provide one IP address per ESXi server in this VLAN.
The Segment ID you have to enter in step 14 in the How to do it… section is rather important, especially ...