> # Assigning FC ID Last Byte

> ## Restrictions

> If the FICON feature is configured in cascaded mode, the Cisco MDS switches use ISLs to connect to other switches.

> ## Detailed Steps

> To assign the last byte for the FC ID, follow these steps:

> 1. Choose All VSANs > Domain Manager.
> 2. Click the Persistent FCIDs tab.
> 3. Select single in the Mask column and then assign the entire FC ID at once. The single option allows you to enter the FC ID in the ###### format.
> 4. Click the Apply Changes icon to save these changes.

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