You can cable the controllers to a cluster by using the two-node switchless cluster method or by using the cluster interconnect network.
Cabling a two node switchless cluster
The management, Fibre Channel, and data or host network ports on the controller modules are connected to switches. The cluster interconnect ports are cabled on both controller modules.
Cabling a switched cluster
All ports on the controllers are connected to switches; cluster interconnect, management, Fibre Channel, and data or host network switches.