In a cross-vCenter NSX deployment, you can create universal logical switches, which can span all vCenters. The transport zone type determines whether the new switch is a logical switch or a universal logical switch. When you add a logical switch to a universal transport zone, the logical switch is universal.
1. In the vSphere Web Client, navigate to Home > Networking & Security > Logical Switches.
2. Select the primary NSX Manager.
3. Click the New Logical Switch () icon.
4. Type a name and optional description for the logical switch.
5. In the Transport Zone section, click Change to select a Transport Zone. Select the universal transport zone to create a universal logical switch. By default, the logical switch inherits the control plane replication mode from the transport zone. You can change it to one of the other available modes. The available modes are unicast, hybrid, and multicast.
(Optional) Click Enable IP Discovery to enable ARP suppression – This setting minimizes ARP traffic flooding within individual VXLAN segments—in other words, between VMs connected to the same logical switch. IP discovery is enabled by default.
(Optional) Click Enable MAC learning if your VMs have multiple MAC addresses or are using virtual NICs that are trunking VLANs – Enabling MAC learning builds a VLAN/MAC pair learning table on each vNIC. This table is stored as part of the dvfilter data. During vMotion, dvfilter saves and restores the table at the new location. The switch then issues RARPs for all the VLAN/MAC entries in the table.