Cisco Nexus 9000 Series Switch requirements When you deploy VMware NSX-T Data Center on a VxBlock System, some requirements apply to the ToR switches. Ensure that the following requirements are met: L3 licensing is present on the switches. All NSX-specific VLANs are deployed. The BGP routing protocol is enabled and configured. Uplinks to the external network are configured as L3. If the uplinks are L2, a separate services engagement is needed to convert the uplinks to L3.