Universal transport zones control the hosts that a universal logical switch can reach. A universal transport zone is created by the primary NSX Manager and is replicated to the secondary NSX Managers. Universal transport zones can span one or more vSphere clusters across the cross-vCenter NSX environment.
1. In vCenter, navigate to Home > Networking & Security > Installation and select the Logical Network Preparation tab.
2. Click Transport Zones and click the New Transport Zone () icon.
3. Select Mark this object for universal synchronization.
These transport zones will be synchronized with the secondary NSX Managers.
4 . Select the control plane mode:
Multicast: Multicast IP addresses in the physical network are used for the control plane. This mode is recommended only when you are upgrading from older VXLAN deployments. Requires PIM/IGMP in the physical network.
Unicast: The control plane is handled by an NSX controller. All unicast traffic leverages optimized headend replication. No multicast IP addresses or special network configuration is required.
Hybrid: Offloads local traffic replication to the physical network (L2 multicast). This requires IGMP snooping on the first-hop switch and access to an IGMP querier in each VTEP subnet, but does not require PIM. The first-hop switch handles traffic replication for the subnet.
5. Select the clusters to add to the transport zone.