The NSX Controller cluster in the NSX for vSphere 6.x platform is the control plane component that is responsible in managing the switching and routing modules in the hypervisors. The controller cluster consists of controller nodes that manage specific logical switches. The use of a controller cluster in managing VXLAN based logical switches eliminates the need for multicast support from the physical network infrastructure. Customers now do not have to provision multicast group IP addresses and also do not need to enable PIM routing or IGMP snooping features on physical switches or routers.