Prepare Host Clusters for NSX - VMware
https://docs.vmware.com/en/VMware-NSX-Data-Center-for-vSphere/6.3/com.vmware.nsx.install.doc/GUID-07ED3DD6-BF82-4097-8702-4587FA88CFE2.html
NSX for vSphere kernel modules packaged in VIB files run within the hypervisor kernel and provide services such as distributed routing, distributed firewall, and VXLAN bridging capabilities. To prepare your environment for network virtualization, you must install network infrastructure components on a per-cluster level for each vCenter server where needed.
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