Like vSphere licensing, VMware NSX is licensed per CPU socket. If you have a separate Management vSphere Cluster that is used for Infrastructure VMs and are not planning to protect it with the NSX Distributed Firewall or place NSX Edge Service Gateways onto it, you are not required to license the CPUs on that Management vSphere Cluster. The Compute vSphere cluster and Edge vSphere cluster need to be licensed.
VMware NSX is licensed at the vSphere Cluster level. If you need to exclude a specific ESXi host from NSX, you will need to remove the ESXi host from the cluster. For vSphere environments with VMware vCenter Site Recovery Manager, you will normally have active sites (Protected site) and passive/disaster recovery sites (Recovery ...
