Apply the following practices when installing large clusters or scaling clusters to larger node counts.

When installing large clusters or scaling the cluster to larger node counts, set the cluster network cidr accordingly in your install-config.yaml file before you install the cluster:

  - cidr:
    hostPrefix: 23
  networkType: OpenShiftSDN

The default clusterNetwork cidr cannot be used if the cluster size is more than 500 nodes. It must be set to or to get to larger node counts beyond 500 nodes.