If you use transport switches, such as a network switch, specify a transport switch name for each interconnect. You can use the default name switchN, where N is a number that is automatically assigned during configuration, or create another name.
Also specify the switch port name or accept the default name. The default port name is the same as the internal node ID number of the node that hosts the adapter end of the cable. However, you cannot use the default port name for certain adapter types, such as SCI-PCI.
Clusters with three or more nodes must use transport switches. Direct connection between cluster nodes is supported only for two-node clusters.
If your two-node cluster is direct connected, you can still specify a transport switch for the interconnect.
If you specify a transport switch, you can more easily add another node to the cluster in the future.