This section describes the system requirements for NSX for vSphere as well as the ports that must be open. System Requirements for NSXBefore you install or upgrade NSX, consider your network configuration and resources. You can install one NSX Manager per vCenter Server, one instance of Guest Introspection per ESXi™ host, and multiple NSX Edge instances per datacenter. Ports and Protocols Required by NSX for vSphere NSX and vSphere Distributed SwitchesIn an NSX domain, NSX vSwitch is the software that operates in server hypervisors to form a software abstraction layer between servers and the physical network. Example: Working with a vSphere Distributed SwitchThis example shows how to create a new vSphere distributed switch (VDS); add port groups for management, storage, and vMotion traffic types; and migrate hosts on a standard vSwitch to the new distributed switch. Understanding Replication ModesWhen you create a transport zone or a logical switch, you must select a replication mode. Understanding the different modes can help you decide which is most appropriate for your environment. NSX Installation Workflow and Sample TopologyNSX installation involves the deployment of several virtual appliances, some ESX host preparation, and some configuration to allow communication across all of the physical and virtual devices. Cross-vCenter NSX and Enhanced Linked ModevSphere 6.0 introduces Enhanced Linked Mode, which links multiple vCenter Server systems by using one or more Platform Services Controllers. This allows you to view and search the inventories of all linked vCenter Server systems within the vSphere Web Client. In a cross-vCenter NSX environment, Enhanced Linked Mode allows to you manage all NSX Managers from a single vSphere Web Client.