Procedure

Procedure

Step 1

In the left pane, click Security Devices and click the device whose interfaces you want to configure and click Interfaces in the Management pane on the right.

Step 2

On the Interfaces page, select the physical interface you want to configure.

Step 3

In the Actions pane on the right, click Edit.

Step 4

Give the physical interface a Logical Name and, optionally, a Description. Unless you configure subinterfaces, the interface should have a name.

Note

If you change the name, the change is automatically reflected everywhere you used the old name, including security zones, syslog server objects, and DHCP server definitions. However, you cannot remove the name until you first remove all configurations that use the name, because you typically cannot use an unnamed interface for any policy or setting.

Step 5

Pick one of these options:

  • If you intend to add sub-interfaces:

If you intend to configure subinterfaces for this physical interface, you are probably done. Click Save and continue with Configure Firepower VLAN Subinterfaces and 802.1Q Trunking ; otherwise, continue.

Note

Even when configuring subinterfaces, it is valid to name the interface and supply IP addresses. This is not the typical setup, but if you know that is what you need, you can configure it.