Library /sys$common/syshlp/tcpip$ucp_help.hlb SET, CONFIGURATION, INTERFACE, Qualifiers, /CLUSTER  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /CLUSTER=host
       /NOCLUSTER

    Optional. Default: None.

    Specifies the cluster host name (alias host identifier).

    Before using this qualifier, first define the same name in the
    hosts database.

    /CLUSTER=host associates the alias host identifier with each
    interface in a cluster.

    /NOCLUSTER disables Internet cluster processing on the specified
    interface.

                                 CAUTION

       When you specify /NOCLUSTER, active communication is aborted
       for applications bound to the cluster alias name.