> # Configuring List of External Interfaces per Server Interface

> A list of external interfaces are linked to the server interfaces when the server interface is down, or if the specified external interface list includes the external interface already in use.

> ## Detailed Steps

> To configure the list of external interfaces per server interface using DCNM-SAN, perform the following tasks:

> 1. Choose Physical Attributes > Switches > FC Services > N_Port Virtualizer (NPV).
> 2. Click the Traffic Map tab.
> 3. Click theicon in the toolbar or right click and then select Create Row....
> 4. Select a Switch from the drop-down list.
> 5. Type the port numbers or click the [...] button (not available on blade server switches) to select the Server Interface and External Interfaces from the port selection dialog box.

> Note You can select only one Server Interface but multiple External Interfaces can be mapped on to it. Previously selected ports are disabled and cannot be selected.

> To delete the map entry, select the row from the Traffic Map tab, and then click the icon in the toolbar or right click and select Delete Row.

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