Cloud Foundation uses a construct called a network pool to automatically configure VMkernel ports for vSAN and vMotion.
Cloud Foundation uses an Internet Protocol Address Management (IPAM) solution to automate the IP configuration of VMkernel ports for vSAN and vMotion. A network pool contains network information details for each network. Each network pool includes network information details for vSAN and vMotion. For example:
When a server is added to the inventory of Cloud Foundation, it goes through a process called host commissioning. During this process, vSphere ESXi servers are associated with an existing network pool. When the host is provisioned during the Create VI Workload Domain, Add Cluster, or Add Host workflow it automatically configures the VMkernel ports used for vSAN and vMotion based on the network pool information and allocates IP addresses for vSAN and vMotion from the network pool it was associated with.
You can expand the Included IP address range of a network pool at any time, however you cannot modify the other network information. Ensure you have defined each subnet in the network pool to account for current and future growth in your environment.