> # Configuring Allowed Domain ID Lists

> ## Prerequisites

> An allowed domain ID list must satisfy the following conditions:

> - If this switch is a principal switch, all the currently assigned domain IDs must be in the allowed list.
> - If this switch is a subordinate switch, the local runtime domain ID must be in the allowed list.
> - The locally configured domain ID of the switch must be in the allowed list.
> - The intersection of the assigned domain IDs with other already configured domain ID lists must not be empty.

> If you configure an allowed list on one switch in the fabric, we recommend that you configure the same list in all other switches in the fabric to ensure consistency or use CFS to distribute the configuration.

> ## Detailed Steps

> To configure the allowed domain ID list, follow these steps:

> 1. Expand Fabric > All VSANs > Domain Manager and then select Allowed in the Logical Domains pane for the fabric and VSAN for which you want to set the allowed domain ID list.

> You see the CFS configuration in the Information pane.

> 2. Set the Admin drop-down menu to enable and set the Global drop-down menu to enable.
> 3. Click Apply Changes to enable CFS distribution for the allowed domain ID list.
> 4. Select the Allowed DomainIds tab.
> 5. Set the list to the allowed domain IDs list for this domain.
> 6. Select the CFS tab and set Config Action to commit.
> 7. Click the Apply Changes icon to commit this allowed domain ID list and distribute it throughout the VSAN.

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