def do_preferrep(self, line):
        """preferrep <member node> [member node ...] Add one or more preferred Member
        Nodes to replication policy."""
        mns = self._split_args(line, 1, -1)
        self._command_processor.get_session().get_replication_policy().add_preferred(
            mns
        )
        self._print_info_if_verbose(
            "Set {} as preferred replication target(s)".format(", ".join(mns))
        )
preferrep <member node> [member node ...] Add one or more preferred Member
        Nodes to replication policy.