Use the following procedure to set the domain ID: Log in to the switch with an admin account. Enter the "configure" command. Enter a unique domain ID at the "Domain". This document describes how to troubleshoot fiber optic interfaces by addressing some of the fiber optic module and cabling specifications. There are no specific requirements for this document. This includes Doppler. When a FICON (TYPE=FC) channel connects to a switch, the SWITCH keyword must be specified on the CHPID statement. command options to configure a switch for point-to-point and cascaded FICON operation, see Administering FICON Fabrics. Cisco switches are devices that connect multiple network devices and enable data transfer between.