HP AE370A HP StorageWorks Fabric OS 6.x administrator guide (5697-0015, May 20 - Page 266

Figure 19 and Figure 20 show two viable cascaded configurations. These configurations require Channel A to be configured for two-byte addressing and require IDID and fabric binding. It is recommended that there are only 2 domains in a path from a FICON Channel interface to a FICON Control Unit interface. Channel A Switch Domain ID = 21 Switch Domain ID = 22 Figure 19 Cascaded configuration, two switches Control Unit B Channel A Switch Domain ID = 21 Switch Domain ID = 22 Control Unit C Switch Domain ID = 23 Control Unit D Figure 20 Cascaded configuration, three switches Setting a unique domain ID In a cascaded configuration, each switch must have a unique domain ID, and insistent domain ID (IDID) mode must be enabled. To set a unique domain ID and enable IDID mode: 1. Connect to the switch and log in as admin. 2. Verify that the switch has a unique domain ID. If it does not, set a unique domain ID. For instructions on displaying and changing the domain ID, see "Working with Domain IDs" on page 33. 3. Enter the switchDisable command to disable the switch. 4. Enter the configure command. 5. Enter y after the Fabric Parameters prompt. 6. To enable IDID mode, enter y after the "Insistent Domain ID Mode" prompt. You can disable this mode by entering n. 7. Respond to the remaining prompts (or press Ctrl-d to accept the other settings and exit). 266 Administering FICON fabrics