> # Default Company ID List

> All switches in the Cisco MDS 9000 Family that ship with Cisco SAN-OS Release 2.0(1b) or later, or NX-OS 4.1(1) contain a default list of company IDs that require area allocation. Using the company ID reduces the number of configured persistent FC ID entries. You can configure or modify these entries using the CLI.

> Caution | Persistent entries take precedence over company ID configuration. If the HBA fails to discover a target, verify that the HBA and the target are connected to the same switch and have the same area in their FC IDs, then perform the following procedure: 1. Shut down the port connected to the HBA. 2. Clear the persistent FC ID entry. 3. Get the company ID from the Port WWN. 4. Add the company ID to the list that requires area allocation. 5. Bring up the port.

> The list of company IDs have the following characteristics:

> - A persistent FC ID configuration always takes precedence over the list of company IDs. Even if the company ID is configured to receive an area, the persistent FC ID configuration results in the allocation of a single FC ID.
> - New company IDs added to subsequent releases are automatically added to existing company IDs.
> - The list of company IDs is saved as part of the running and saved configuration.
> - The list of company IDs is used only when the fcinterop FC ID allocation scheme is in auto mode. By default, the interop FC ID allocation is set to auto, unless changed.

> Tip We recommend that you set the fcinterop FC ID allocation scheme to auto and use the company ID list and persistent FC ID configuration to manipulate the FC ID device allocation.

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