4.7 Control Plane Mode
When the NSX Controller cluster is deployed, the multicast control plane mode can optionally be changed to unicast or hybrid modes to enable controller-based VXLAN overlays. The unicast control plane mode does not require multicast in the underlying network at all. Hybrid mode does not require multicast routing across L3 domains (PIM) but relies on multicast in each L2 switching domain.
The change of the control plane mode is made in the VMware NSX user interface on the transport zones corresponding to each Provider Virtual Data Center (PVDC) VXLAN network pool. All existing logical switches (VXLAN logical networks) must be migrated to the new control plane mode as well.
Figure 14. Change of Transport Zone Control Plane Mode (1 of 2)
The change of control plane mode and migration of existing logical switches has no impact on the networking data plane traffic.
Figure 15. Change of Transport Zone Control Plane Mode (2 of 2)
