You must have console access to all cluster nodes. If you install Cluster Control Panel software on an administrative console, you must provide the hostname and port number of the console-access device that is used to communicate with the cluster nodes.
A terminal concentrator is used to communicate between the administrative console and the global-cluster node consoles.
A Sun Enterprise 10000 server uses a System Service Processor (SSP) instead of a terminal concentrator.
A Sun Fire server uses a system controller instead of a terminal concentrator.
For more information about console access, see the Sun Cluster Concepts Guide for Solaris OS.
Alternatively, if you connect an administrative console directly to cluster nodes or through a management network, you instead provide the hostname of each global-cluster node and its serial port number that is used to connect to the administrative console or the management network.